python-zope.testrunner 4.4.2-0ubuntu2 / usr / lib / python2.7 / dist-packages / zope.testrunner-4.4.2.egg-info / PKG-INFO

Metadata-Version: 1.1
Name: zope.testrunner
Version: 4.4.2
Summary: Zope testrunner script.
Home-page: http://pypi.python.org/pypi/zope.testrunner
Author: Zope Foundation and Contributors
Author-email: zope-dev@zope.org
License: ZPL 2.1
Description: ***************
        zope.testrunner
        ***************
        
        |buildstatus|_
        |winbotstatus|_
        
        .. contents::
        
        This package provides a flexible test runner with layer support.
        
        You can find more `detailed documentation`_ on PyPI or in the ``src/``
        directory.
        
        
        Getting started
        ***************
        
        Buildout-based projects
        =======================
        
        zope.testrunner is often used for projects that use buildout_::
        
            [buildout]
            develop = .
            parts = ... test ...
        
            [test]
            recipe = zc.recipe.testrunner
            eggs = mypackage
        
        The usual buildout process ::
        
            python bootstrap.py
            bin/buildout
        
        creates a ``bin/test`` script that will run the tests for *mypackage*.
        
        .. tip::
        
            zc.recipe.testrunner_ takes care to specify the right
            ``--test-path`` option in the generated script.  You can add
            other options (such as ``--tests-pattern``) too; check
            zc.recipe.testrunner_'s documentation for details.
        
        
        Virtualenv-based projects
        =========================
        
        ``pip install zope.testrunner`` and you'll get a ``zope-testrunner``
        script.  Run your tests with ::
        
            zope-testrunner --test-path=path/to/your/source/tree
        
        Your source code needs to be available for the testrunner to import,
        so you need to run ``python setup.py install`` or ``pip install -e
        .`` into the same virtualenv_.
        
        
        Some useful command-line options to get you started
        ===================================================
        
        -p              show a percentage indicator
        -v              increase verbosity
        -c              colorize the output
        -t test         specify test names (one or more regexes)
        -m module       specify test modules (one or more regexes)
        -s package      specify test packages (one or more regexes)
        --list-tests    show names of tests instead of running them
        -x              stop on first error or failure
        -D, --pdb       enable post-mortem debugging of test failures
        --help          show *all* command-line options (there are many more!)
        
        For example ::
        
            bin/test -pvc -m test_foo -t TestBar
        
        runs all TestBar tests from a module called test_foo.py.
        
        
        Writing tests
        =============
        
        ``zope.testrunner`` expects to find your tests inside your package
        directory, in a subpackage or module named ``tests``.  Test modules
        in a test subpackage should be named ``test*.py``.
        
        .. tip::
        
            You can change these assumptions with ``--tests-pattern`` and
            ``--test-file-pattern`` test runner options.
        
        Tests themselves should be classes inheriting from
        ``unittest.TestCase``, and if you wish to use doctests, please tell
        the test runner where to find them and what options to use for them
        in by supplying a function named ``test_suite``.
        
        Example::
        
            import unittest
            import doctest
        
            class TestArithmetic(unittest.TestCase):
        
                def test_two_plus_two(self):
                    self.assertEqual(2 + 2, 4)
        
        
            def doctest_string_formatting():
                """Test Python string formatting
        
                    >>> print('{} + {}'.format(2, 2))
                    2 + 2
        
                """
        
            def test_suite():
                return unittest.TestSuite([
                    unittest.makeSuite(TestArithmetic),
                    doctest.DocTestSuite(),
                    doctest.DocFileSuite('../README.txt',
                                         optionflags=doctest.ELLIPSIS),
                ])
        
        
        Test grouping
        =============
        
        In addition to per-package and per-module filtering, zope.testrunner
        has other mechanisms for grouping tests:
        
        * **layers** allow you to have shared setup/teardown code to be used
          by a group of tests, that is executed only once, and not for each
          test.  Layers are orthogonal to the usual package/module structure
          and are specified by setting the ``layer`` attribute on test
          suites.
        
        * **levels** allow you to group slow-running tests and not run them
          by default.  They're specified by setting the ``level`` attribute
          on test suites to an int.
        
        For more details please see the `detailed documentation`_.
        
        
        Other features
        ==============
        
        zope.testrunner can profile your tests, measure test coverage,
        check for memory leaks, integrate with subunit_, shuffle the
        test execution order, and run multiple tests in parallel.
        
        For more details please see the `detailed documentation`_.
        
        .. _buildout: http://www.buildout.org/
        .. _virtualenv: http://www.virtualenv.org/
        .. _zc.recipe.testrunner: http://pypi.python.org/pypi/zc.recipe.testrunner
        .. _subunit: http://pypi.python.org/pypi/subunit
        .. _detailed documentation: http://docs.zope.org/zope.testrunner/
        
        .. |buildstatus| image:: https://api.travis-ci.org/zopefoundation/zope.testrunner.png?branch=master
        .. _buildstatus: https://travis-ci.org/zopefoundation/zope.testrunner
        
        .. |winbotstatus| image:: http://winbot.zope.org/buildstatusimage?builder=zope.testrunner_py_265_32&number=-1
        .. _winbotstatus: http://winbot.zope.org/builders/zope.testrunner_py_265_32/builds/-1
        
        zope.testrunner Changelog
        *************************
        
        4.4.2 (2014-02-22)
        ==================
        
        - Drop support for Python 3.1.
        
        - Fix post-mortem debugging when a non-printable exception happens
          (https://github.com/zopefoundation/zope.testrunner/issues/8).
        
        
        4.4.1 (2013-07-10)
        ==================
        
        - Updated ``boostrap.py`` to version 2.2.
        
        - Fix nondeterministic test failures on Python 3.3
        
        - Tear down layers after ``post_mortem`` debugging is finished.
        
        - Fix tests that write to source directory, it might be read-only.
        
        
        4.4.0 (2013-06-06)
        ==================
        
        - Fix tests selection when the negative "!" pattern is used several times
          (LP #1160965)
        
        - Moved tests into a 'tests' subpackage.
        
        - Made ``python -m zope.testrunner`` work again.
        
        - Support 'skip' feature of unittest2 (which became the new unittest in Python
          2.7).
        
        - Better diagnostics when communication with subprocess fails
          (https://github.com/zopefoundation/zope.testrunner/issues/5).
        
        - Do not break subprocess execution when the test suite changes the working
          directory (https://github.com/zopefoundation/zope.testrunner/issues/6).
        
        - Count test module import errors as errors (LP #1026576).
        
        
        4.3.3 (2013-03-03)
        ==================
        
        - Running layers in sub-processes did not use to work when run via
          ``python setup.py ftest`` since it tried to run setup.py with all the
          command line options. It now detects ``setup.py`` runs and we run the test
          runner directly.
        
        
        4.3.2 (2013-03-03)
        ==================
        
        - Fix ``SkipLayers`` class in cases where the distribution specifies a
          ``test_suite`` value.
        
        
        4.3.1 (2013-03-02)
        ==================
        
        - Fixed a bug in the `ftest` command and added a test.
        
        - Fixed a trivial test failure with Python 3 of the previous release.
        
        
        4.3.0 (2013-03-02)
        ==================
        
        - Expose `ftest` distutils command via an entry point.
        
        - Added tests for ``zope.testrunner.eggsupport``.
        
        
        4.2.0 (2013-02-12)
        ==================
        
        - Dropped use of 2to3, rewrote source code to be compatible with all Python
          versions.  Introduced a dependency on `six`_.
        
        
        4.1.1 (2013-02-08)
        ==================
        
        - Dropped use of zope.fixers (LP: #1118877).
        
        - Fixed tox test error reporting; fixed tests on Pythons 2.6, 3.1, 3.2, 3.3 and
          PyPy 1.9.
        
        - Fix --shuffle ordering on Python 3.2 to be the same as it was on older Python
          versions.
        
        - Fix --shuffle nondeterminism when multiple test layers are present.
          Note: this will likely change the order of tests for the same --shuffle-seed.
        
        - New option: --profile-directory.  Use it in the test suite so that tests
          executed by detox in parallel don't conflict.
        
        - Use a temporary coverage directory in the test suite so that tests
          executed by detox in parallel don't conflict.
        
        - Fix --post-mortem (aka -D, --pdb) when a test module cannot be imported
          or is invalid (LP #1119363).
        
        
        4.1.0 (2013-02-07)
        ==================
        
        - Replaced deprecated ``zope.interface.implements`` usage with equivalent
          ``zope.interface.implementer`` decorator.
        
        - Dropped support for Python 2.4 and 2.5.
        
        - Made StartUpFailure compatible with unittest.TextTestRunner() (LP #1118344).
        
        
        4.0.4 (2011-10-25)
        ==================
        
        - Work around sporadic timing-related issues in the subprocess buffering
          tests.  Thanks to Jonathan Ballet for the patch!
        
        
        4.0.3 (2011-03-17)
        ==================
        
        - Added back support for Python <= 2.6 which was broken in 4.0.2.
        
        
        4.0.2 (2011-03-16)
        ==================
        
        - Added back Python 3 support which was broken in 4.0.1.
        
        - Fixed `Unexpected success`_ support by implementing the whole concept.
        
        - Added support for the new __pycache__ directories in Python 3.2.
        
        
        4.0.1 (2011-02-21)
        ==================
        
        - LP #719369: An `Unexpected success`_ (concept introduced in Python 2.7) is
          no longer handled as success but as failure. This is a workaround. The
          whole unexpected success concept might be implemented later.
        
        .. _`Unexpected success`: http://www.voidspace.org.uk/python/articles/unittest2.shtml#more-skipping
        
        
        4.0.0 (2010-10-19)
        ==================
        
        - Show more information about layers whose setup fails (LP #638153).
        
        
        4.0.0b5 (2010-07-20)
        ====================
        
        - Update fix for LP #221151 to a spelling compatible with Python 2.4.
        
        - Timestamps are now always included in subunit output (r114849).
        
        - LP #591309: fix a crash when subunit reports test failures containing
          UTF8-encoded data.
        
        
        4.0.0b4 (2010-06-23)
        ====================
        
        - Package as a zipfile to work around Python 2.4 distutils bug (no
          feature changes or bugfixes in ``zope.testrunner`` itself).
        
        
        4.0.0b3 (2010-06-16)
        ====================
        
        - LP #221151: keep ``unittest.TestCase.shortDescription`` happy by supplying
          a ``_testMethodDoc`` attribute.
        
        - LP #595052: keep the distribution installable under Python 2.4:  its
          distutils appears to munge the empty ``__init__.py`` file in the
          ``foo.bar`` egg used for testing into a directory.
        
        - LP #580083: fix the ``bin/test`` script to run only tests from
          ``zope.testrunner``.
        
        - LP #579019: When layers were run in parallel, their tearDown was
          not called. Additionally, the first layer which was run in the main
          thread did not have its tearDown called either.
        
        
        4.0.0b2 (2010-05-03)
        ====================
        
        - Having 'sampletests' in the MANIFEST.in gave warnings, but doesn't actually
          seem to include any more files, so I removed it.
        
        - Moved zope.testing.exceptions to zope.testrunner.exceptions. Now
          zope.testrunner no longer requires zope.testing except for when running
          its own tests.
        
        
        4.0.0b1 (2010-04-29)
        ====================
        
        - Initial release of the testrunner from zope.testrunner as its own module.
        
        
        .. _six: http://pypi.python.org/pypi/six
        
        Detailed Documentation
        **********************
        
        Test Runner
        ===========
        
        The testrunner module is used to run automated tests defined using the
        unittest framework.  Its primary feature is that it *finds* tests by
        searching directory trees.  It doesn't require the manual
        concatenation of specific test suites.  It is highly customizable and
        should be usable with any project.  In addition to finding and running
        tests, it provides the following additional features:
        
        - Test filtering using specifications of:
        
          o test packages within a larger tree
        
          o regular expression patterns for test modules
        
          o regular expression patterns for individual tests
        
        - Organization of tests into levels and layers
        
          Sometimes, tests take so long to run that you don't want to run them
          on every run of the test runner.  Tests can be defined at different
          levels.  The test runner can be configured to only run tests at a
          specific level or below by default.  Command-line options can be
          used to specify a minimum level to use for a specific run, or to run
          all tests.  Individual tests or test suites can specify their level
          via a 'level' attribute. where levels are integers increasing from 1.
        
          Most tests are unit tests.  They don't depend on other facilities, or
          set up whatever dependencies they have.  For larger applications,
          it's useful to specify common facilities that a large number of
          tests share.  Making each test set up and and tear down these
          facilities is both ineffecient and inconvenient.  For this reason,
          we've introduced the concept of layers, based on the idea of layered
          application architectures.  Software build for a layer should be
          able to depend on the facilities of lower layers already being set
          up.  For example, Zope defines a component architecture.  Much Zope
          software depends on that architecture.  We should be able to treat
          the component architecture as a layer that we set up once and reuse.
          Similarly, Zope application software should be able to depend on the
          Zope application server without having to set it up in each test.
        
          The test runner introduces test layers, which are objects that can
          set up environments for tests within the layers to use.  A layer is
          set up before running the tests in it.  Individual tests or test
          suites can define a layer by defining a `layer` attribute, which is
          a test layer.
        
        - Reporting
        
          - progress meter
        
          - summaries of tests run
        
        - Analysis of test execution
        
          - post-mortem debugging of test failures
        
          - memory leaks
        
          - code coverage
        
          - source analysis using pychecker
        
          - memory errors
        
          - execution times
        
          - profiling
        
        Simple Usage
        ============
        
        The test runner consists of an importable module.  The test runner is
        used by providing scripts that import and invoke the `run` method from
        the module.  The `testrunner` module is controlled via command-line
        options.  Test scripts supply base and default options by supplying a
        list of default command-line options that are processed before the
        user-supplied command-line options are provided.
        
        Typically, a test script does 2 things:
        
        - Adds the directory containing the zope package to the Python
          path.
        
        - Calls the test runner with default arguments and arguments supplied
          to the script.
        
          Normally, it just passes default/setup arguments.  The test runner
          uses `sys.argv` to get the user's input.
        
        This testrunner_ex subdirectory contains a number of sample packages
        with tests.  Let's run the tests found here. First though, we'll set
        up our default options:
        
            >>> import os.path
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
        The default options are used by a script to customize the test runner
        for a particular application.  In this case, we use two options:
        
        path
          Set the path where the test runner should look for tests.  This path
          is also added to the Python path.
        
        tests-pattern
          Tell the test runner how to recognize modules or packages containing
          tests.
        
        Now, if we run the tests, without any other options:
        
            >>> from zope import testrunner
            >>> import sys
            >>> sys.argv = ['test']
            >>> testrunner.run_internal(defaults)
            Running samplelayers.Layer1 tests:
              Set up samplelayers.Layer1 in N.NNN seconds.
              Ran 9 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer11 tests:
              Set up samplelayers.Layer11 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer111 tests:
              Set up samplelayers.Layerx in N.NNN seconds.
              Set up samplelayers.Layer111 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer112 tests:
              Tear down samplelayers.Layer111 in N.NNN seconds.
              Set up samplelayers.Layer112 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer12 tests:
              Tear down samplelayers.Layer112 in N.NNN seconds.
              Tear down samplelayers.Layerx in N.NNN seconds.
              Tear down samplelayers.Layer11 in N.NNN seconds.
              Set up samplelayers.Layer12 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer121 tests:
              Set up samplelayers.Layer121 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer122 tests:
              Tear down samplelayers.Layer121 in N.NNN seconds.
              Set up samplelayers.Layer122 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running zope.testrunner.layer.UnitTests tests:
              Tear down samplelayers.Layer122 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            Total: 321 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            False
        
        we see the normal testrunner output, which summarizes the tests run for
        each layer.  For each layer, we see what layers had to be torn down or
        set up to run the layer and we see the number of tests run, with
        results.
        
        The test runner returns a boolean indicating whether there were
        errors.  In this example, there were no errors, so it returned False.
        
        (Of course, the times shown in these examples are just examples.
        Times will vary depending on system speed.)
        
        Layers
        ======
        
        A Layer is an object providing setup and teardown methods used to setup
        and teardown the environment provided by the layer. It may also provide
        setup and teardown methods used to reset the environment provided by the
        layer between each test.
        
        Layers are generally implemented as classes using class methods.
        
        >>> class BaseLayer:
        ...     def setUp(cls):
        ...         log('BaseLayer.setUp')
        ...     setUp = classmethod(setUp)
        ...
        ...     def tearDown(cls):
        ...         log('BaseLayer.tearDown')
        ...     tearDown = classmethod(tearDown)
        ...
        ...     def testSetUp(cls):
        ...         log('BaseLayer.testSetUp')
        ...     testSetUp = classmethod(testSetUp)
        ...
        ...     def testTearDown(cls):
        ...         log('BaseLayer.testTearDown')
        ...     testTearDown = classmethod(testTearDown)
        ...
        
        Layers can extend other layers. Note that they do not explicitly
        invoke the setup and teardown methods of other layers - the test runner
        does this for us in order to minimize the number of invocations.
        
        >>> class TopLayer(BaseLayer):
        ...     def setUp(cls):
        ...         log('TopLayer.setUp')
        ...     setUp = classmethod(setUp)
        ...
        ...     def tearDown(cls):
        ...         log('TopLayer.tearDown')
        ...     tearDown = classmethod(tearDown)
        ...
        ...     def testSetUp(cls):
        ...         log('TopLayer.testSetUp')
        ...     testSetUp = classmethod(testSetUp)
        ...
        ...     def testTearDown(cls):
        ...         log('TopLayer.testTearDown')
        ...     testTearDown = classmethod(testTearDown)
        ...
        
        Tests or test suites specify what layer they need by storing a reference
        in the 'layer' attribute.
        
        >>> import unittest
        >>> class TestSpecifyingBaseLayer(unittest.TestCase):
        ...     'This TestCase explicitly specifies its layer'
        ...     layer = BaseLayer
        ...     name = 'TestSpecifyingBaseLayer' # For testing only
        ...
        ...     def setUp(self):
        ...         log('TestSpecifyingBaseLayer.setUp')
        ...
        ...     def tearDown(self):
        ...         log('TestSpecifyingBaseLayer.tearDown')
        ...
        ...     def test1(self):
        ...         log('TestSpecifyingBaseLayer.test1')
        ...
        ...     def test2(self):
        ...         log('TestSpecifyingBaseLayer.test2')
        ...
        >>> class TestSpecifyingNoLayer(unittest.TestCase):
        ...     'This TestCase specifies no layer'
        ...     name = 'TestSpecifyingNoLayer' # For testing only
        ...     def setUp(self):
        ...         log('TestSpecifyingNoLayer.setUp')
        ...
        ...     def tearDown(self):
        ...         log('TestSpecifyingNoLayer.tearDown')
        ...
        ...     def test1(self):
        ...         log('TestSpecifyingNoLayer.test')
        ...
        ...     def test2(self):
        ...         log('TestSpecifyingNoLayer.test')
        ...
        
        Create a TestSuite containing two test suites, one for each of
        TestSpecifyingBaseLayer and TestSpecifyingNoLayer.
        
        >>> umbrella_suite = unittest.TestSuite()
        >>> umbrella_suite.addTest(unittest.makeSuite(TestSpecifyingBaseLayer))
        >>> no_layer_suite = unittest.makeSuite(TestSpecifyingNoLayer)
        >>> umbrella_suite.addTest(no_layer_suite)
        
        Before we can run the tests, we need to setup some helpers.
        
        >>> from zope.testrunner import options
        >>> from zope.testing.loggingsupport import InstalledHandler
        >>> import logging
        >>> log_handler = InstalledHandler('zope.testrunner.tests')
        >>> def log(msg):
        ...     logging.getLogger('zope.testrunner.tests').info(msg)
        >>> def fresh_options():
        ...     opts = options.get_options(['--test-filter', '.*'])
        ...     opts.resume_layer = None
        ...     opts.resume_number = 0
        ...     return opts
        
        Now we run the tests. Note that the BaseLayer was not setup when
        the TestSpecifyingNoLayer was run and setup/torn down around the
        TestSpecifyingBaseLayer tests.
        
        >>> from zope.testrunner.runner import Runner
        >>> runner = Runner(options=fresh_options(), args=[], found_suites=[umbrella_suite])
        >>> succeeded = runner.run()
        Running ...BaseLayer tests:
          Set up ...BaseLayer in N.NNN seconds.
          Ran 2 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
        Running zope.testrunner.layer.UnitTests tests:
          Tear down ...BaseLayer in N.NNN seconds.
          Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
          Ran 2 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
        Tearing down left over layers:
          Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        Total: 4 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
        
        
        Now lets specify a layer in the suite containing TestSpecifyingNoLayer
        and run the tests again. This demonstrates the other method of specifying
        a layer. This is generally how you specify what layer doctests need.
        
        >>> no_layer_suite.layer = BaseLayer
        >>> runner = Runner(options=fresh_options(), args=[], found_suites=[umbrella_suite])
        >>> succeeded = runner.run()
        Running ...BaseLayer tests:
          Set up ...BaseLayer in N.NNN seconds.
          Ran 4 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
        Tearing down left over layers:
          Tear down ...BaseLayer in N.NNN seconds.
        
        Clear our logged output, as we want to inspect it shortly.
        
        >>> log_handler.clear()
        
        Now lets also specify a layer in the TestSpecifyingNoLayer class and rerun
        the tests. This demonstrates that the most specific layer is used. It also
        shows the behavior of nested layers - because TopLayer extends BaseLayer,
        both the BaseLayer and TopLayer environments are setup when the
        TestSpecifyingNoLayer tests are run.
        
        >>> TestSpecifyingNoLayer.layer = TopLayer
        >>> runner = Runner(options=fresh_options(), args=[], found_suites=[umbrella_suite])
        >>> succeeded = runner.run()
        Running ...BaseLayer tests:
          Set up ...BaseLayer in N.NNN seconds.
          Ran 2 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
        Running ...TopLayer tests:
          Set up ...TopLayer in N.NNN seconds.
          Ran 2 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
        Tearing down left over layers:
          Tear down ...TopLayer in N.NNN seconds.
          Tear down ...BaseLayer in N.NNN seconds.
        Total: 4 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
        
        
        If we inspect our trace of what methods got called in what order, we can
        see that the layer setup and teardown methods only got called once. We can
        also see that the layer's test setup and teardown methods got called for
        each test using that layer in the right order.
        
        >>> def report():
        ...     print("Report:")
        ...     for record in log_handler.records:
        ...         print(record.getMessage())
        >>> report()
        Report:
        BaseLayer.setUp
        BaseLayer.testSetUp
        TestSpecifyingBaseLayer.setUp
        TestSpecifyingBaseLayer.test1
        TestSpecifyingBaseLayer.tearDown
        BaseLayer.testTearDown
        BaseLayer.testSetUp
        TestSpecifyingBaseLayer.setUp
        TestSpecifyingBaseLayer.test2
        TestSpecifyingBaseLayer.tearDown
        BaseLayer.testTearDown
        TopLayer.setUp
        BaseLayer.testSetUp
        TopLayer.testSetUp
        TestSpecifyingNoLayer.setUp
        TestSpecifyingNoLayer.test
        TestSpecifyingNoLayer.tearDown
        TopLayer.testTearDown
        BaseLayer.testTearDown
        BaseLayer.testSetUp
        TopLayer.testSetUp
        TestSpecifyingNoLayer.setUp
        TestSpecifyingNoLayer.test
        TestSpecifyingNoLayer.tearDown
        TopLayer.testTearDown
        BaseLayer.testTearDown
        TopLayer.tearDown
        BaseLayer.tearDown
        
        Now lets stack a few more layers to ensure that our setUp and tearDown
        methods are called in the correct order.
        
        >>> from zope.testrunner.find import name_from_layer
        >>> class A(object):
        ...     def setUp(cls):
        ...         log('%s.setUp' % name_from_layer(cls))
        ...     setUp = classmethod(setUp)
        ...
        ...     def tearDown(cls):
        ...         log('%s.tearDown' % name_from_layer(cls))
        ...     tearDown = classmethod(tearDown)
        ...
        ...     def testSetUp(cls):
        ...         log('%s.testSetUp' % name_from_layer(cls))
        ...     testSetUp = classmethod(testSetUp)
        ...
        ...     def testTearDown(cls):
        ...         log('%s.testTearDown' % name_from_layer(cls))
        ...     testTearDown = classmethod(testTearDown)
        ...         
        >>> class B(A): pass
        >>> class C(B): pass
        >>> class D(A): pass
        >>> class E(D): pass
        >>> class F(C,E): pass
        
        >>> class DeepTest(unittest.TestCase):
        ...     layer = F
        ...     def test(self):
        ...         pass
        >>> suite = unittest.makeSuite(DeepTest)
        >>> log_handler.clear()
        >>> runner = Runner(options=fresh_options(), args=[], found_suites=[suite])
        >>> succeeded = runner.run() #doctest: +ELLIPSIS
        Running ...F tests:
          Set up ...A in N.NNN seconds.
          Set up ...B in N.NNN seconds.
          Set up ...C in N.NNN seconds.
          Set up ...D in N.NNN seconds.
          Set up ...E in N.NNN seconds.
          Set up ...F in N.NNN seconds.
          Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
        Tearing down left over layers:
          Tear down ...F in N.NNN seconds.
          Tear down ...E in N.NNN seconds.
          Tear down ...D in N.NNN seconds.
          Tear down ...C in N.NNN seconds.
          Tear down ...B in N.NNN seconds.
          Tear down ...A in N.NNN seconds.
        
        
        >>> report() #doctest: +ELLIPSIS
        Report:
        ...A.setUp
        ...B.setUp
        ...C.setUp
        ...D.setUp
        ...E.setUp
        ...F.setUp
        ...A.testSetUp
        ...B.testSetUp
        ...C.testSetUp
        ...D.testSetUp
        ...E.testSetUp
        ...F.testSetUp
        ...F.testTearDown
        ...E.testTearDown
        ...D.testTearDown
        ...C.testTearDown
        ...B.testTearDown
        ...A.testTearDown
        ...F.tearDown
        ...E.tearDown
        ...D.tearDown
        ...C.tearDown
        ...B.tearDown
        ...A.tearDown
        
        
        Layer Selection
        ===============
        
        We can select which layers to run using the --layer option:
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
            >>> sys.argv = 'test --layer 112 --layer Unit'.split()
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults)
            Running samplelayers.Layer112 tests:
              Set up samplelayers.Layerx in N.NNN seconds.
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer11 in N.NNN seconds.
              Set up samplelayers.Layer112 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running zope.testrunner.layer.UnitTests tests:
              Tear down samplelayers.Layer112 in N.NNN seconds.
              Tear down samplelayers.Layerx in N.NNN seconds.
              Tear down samplelayers.Layer11 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            Total: 182 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            False
        
        
        We can also specify that we want to run only the unit tests:
        
            >>> sys.argv = 'test -u'.split()
            >>> testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        Or that we want to run all of the tests except for the unit tests:
        
            >>> sys.argv = 'test -f'.split()
            >>> testrunner.run_internal(defaults)
            Running samplelayers.Layer1 tests:
              Set up samplelayers.Layer1 in N.NNN seconds.
              Ran 9 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer11 tests:
              Set up samplelayers.Layer11 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer111 tests:
              Set up samplelayers.Layerx in N.NNN seconds.
              Set up samplelayers.Layer111 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer112 tests:
              Tear down samplelayers.Layer111 in N.NNN seconds.
              Set up samplelayers.Layer112 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer12 tests:
              Tear down samplelayers.Layer112 in N.NNN seconds.
              Tear down samplelayers.Layerx in N.NNN seconds.
              Tear down samplelayers.Layer11 in N.NNN seconds.
              Set up samplelayers.Layer12 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer121 tests:
              Set up samplelayers.Layer121 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer122 tests:
              Tear down samplelayers.Layer121 in N.NNN seconds.
              Set up samplelayers.Layer122 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            Total: 165 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            False
        
        Or we can explicitly say that we want both unit and non-unit tests.
        
            >>> sys.argv = 'test -uf'.split()
            >>> testrunner.run_internal(defaults)
            Running samplelayers.Layer1 tests:
              Set up samplelayers.Layer1 in N.NNN seconds.
              Ran 9 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer11 tests:
              Set up samplelayers.Layer11 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer111 tests:
              Set up samplelayers.Layerx in N.NNN seconds.
              Set up samplelayers.Layer111 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer112 tests:
              Tear down samplelayers.Layer111 in N.NNN seconds.
              Set up samplelayers.Layer112 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer12 tests:
              Tear down samplelayers.Layer112 in N.NNN seconds.
              Tear down samplelayers.Layerx in N.NNN seconds.
              Tear down samplelayers.Layer11 in N.NNN seconds.
              Set up samplelayers.Layer12 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer121 tests:
              Set up samplelayers.Layer121 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer122 tests:
              Tear down samplelayers.Layer121 in N.NNN seconds.
              Set up samplelayers.Layer122 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running zope.testrunner.layer.UnitTests tests:
              Tear down samplelayers.Layer122 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            Total: 321 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            False
        
        It is possible to force the layers to run in subprocesses and parallelize them.
        
            >>> sys.argv = [testrunner_script, '-j2']
            >>> testrunner.run_internal(defaults)
            Running samplelayers.Layer1 tests:
              Set up samplelayers.Layer1 in N.NNN seconds.
              Ran 9 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running samplelayers.Layer11 tests:
              Running in a subprocess.
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer11 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
              Tear down samplelayers.Layer11 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            Running samplelayers.Layer111 tests:
              Running in a subprocess.
              Set up samplelayers.Layerx in N.NNN seconds.
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer11 in N.NNN seconds.
              Set up samplelayers.Layer111 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
              Tear down samplelayers.Layer111 in N.NNN seconds.
              Tear down samplelayers.Layerx in N.NNN seconds.
              Tear down samplelayers.Layer11 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            Running samplelayers.Layer112 tests:
              Running in a subprocess.
              Set up samplelayers.Layerx in N.NNN seconds.
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer11 in N.NNN seconds.
              Set up samplelayers.Layer112 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
              Tear down samplelayers.Layer112 in N.NNN seconds.
              Tear down samplelayers.Layerx in N.NNN seconds.
              Tear down samplelayers.Layer11 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            Running samplelayers.Layer12 tests:
              Running in a subprocess.
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer12 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            Running samplelayers.Layer121 tests:
              Running in a subprocess.
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer12 in N.NNN seconds.
              Set up samplelayers.Layer121 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
              Tear down samplelayers.Layer121 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            Running samplelayers.Layer122 tests:
              Running in a subprocess.
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer12 in N.NNN seconds.
              Set up samplelayers.Layer122 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
              Tear down samplelayers.Layer122 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            Running zope.testrunner.layer.UnitTests tests:
              Running in a subprocess.
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer1 in N.NNN seconds.
            Total: 321 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            False
        
        Passing arguments explicitly
        ============================
        
        In most of the examples here, we set up `sys.argv`.  In normal usage,
        the testrunner just uses `sys.argv`.  It is possible to pass arguments
        explicitly.
        
            >>> import os.path
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults, 'test --layer 111'.split())
            Running samplelayers.Layer111 tests:
              Set up samplelayers.Layerx in N.NNN seconds.
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer11 in N.NNN seconds.
              Set up samplelayers.Layer111 in N.NNN seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer111 in N.NNN seconds.
              Tear down samplelayers.Layerx in N.NNN seconds.
              Tear down samplelayers.Layer11 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            False
        
        If options already have default values, then passing a different default will
        override.
        
        For example, --list-tests defaults to being turned off, but if we pass in a
        different default, that one takes effect.
        
            >>> defaults = [
            ...     '--list-tests',
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults, 'test --layer 111'.split())
            Listing samplelayers.Layer111 tests:
              test_x1 (sample1.sampletests.test111.TestA)
              test_y0 (sample1.sampletests.test111.TestA)
              test_z0 (sample1.sampletests.test111.TestA)
              test_x0 (sample1.sampletests.test111.TestB)
              test_y1 (sample1.sampletests.test111.TestB)
              test_z0 (sample1.sampletests.test111.TestB)
              test_1 (sample1.sampletests.test111.TestNotMuch)
              test_2 (sample1.sampletests.test111.TestNotMuch)
              test_3 (sample1.sampletests.test111.TestNotMuch)
              test_x0 (sample1.sampletests.test111)
              test_y0 (sample1.sampletests.test111)
              test_z1 (sample1.sampletests.test111)
              /home/benji/workspace/zope.testrunner/1/src/zope/testing/testrunner/testrunner-ex/sample1/sampletests/../../sampletestsl.txt
              test_x1 (sampletests.test111.TestA)
              test_y0 (sampletests.test111.TestA)
              test_z0 (sampletests.test111.TestA)
              test_x0 (sampletests.test111.TestB)
              test_y1 (sampletests.test111.TestB)
              test_z0 (sampletests.test111.TestB)
              test_1 (sampletests.test111.TestNotMuch)
              test_2 (sampletests.test111.TestNotMuch)
              test_3 (sampletests.test111.TestNotMuch)
              test_x0 (sampletests.test111)
              test_y0 (sampletests.test111)
              test_z1 (sampletests.test111)
              /home/benji/workspace/zope.testrunner/1/src/zope/testing/testrunner/testrunner-ex/sampletests/../sampletestsl.txt
            False
        
        Verbose Output
        ==============
        
        Normally, we just get a summary.  We can use the -v option to get
        increasingly more information.
        
        If we use a single --verbose (-v) option, we get a dot printed for each
        test:
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
            >>> sys.argv = 'test --layer 122 -v'.split()
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
              Set up samplelayers.Layer122 in 0.000 seconds.
              Running:
                ..................................
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.007 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in 0.000 seconds.
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
            False
        
        If there are more than 50 tests, the dots are printed in groups of
        50:
        
            >>> sys.argv = 'test -uv'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
            ................................................................................................................................................................................................
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in 0.035 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        If the --verbose (-v) option is used twice, then the name and location of
        each test is printed as it is run:
        
            >>> sys.argv = 'test --layer 122 -vv'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
              Set up samplelayers.Layer122 in 0.000 seconds.
              Running:
                test_x1 (sample1.sampletests.test122.TestA)
                test_y0 (sample1.sampletests.test122.TestA)
                test_z0 (sample1.sampletests.test122.TestA)
                test_x0 (sample1.sampletests.test122.TestB)
                test_y1 (sample1.sampletests.test122.TestB)
                test_z0 (sample1.sampletests.test122.TestB)
                test_1 (sample1.sampletests.test122.TestNotMuch)
                test_2 (sample1.sampletests.test122.TestNotMuch)
                test_3 (sample1.sampletests.test122.TestNotMuch)
                test_x0 (sample1.sampletests.test122)
                test_y0 (sample1.sampletests.test122)
                test_z1 (sample1.sampletests.test122)
                testrunner-ex/sample1/sampletests/../../sampletestsl.txt
                test_x1 (sampletests.test122.TestA)
                test_y0 (sampletests.test122.TestA)
                test_z0 (sampletests.test122.TestA)
                test_x0 (sampletests.test122.TestB)
                test_y1 (sampletests.test122.TestB)
                test_z0 (sampletests.test122.TestB)
                test_1 (sampletests.test122.TestNotMuch)
                test_2 (sampletests.test122.TestNotMuch)
                test_3 (sampletests.test122.TestNotMuch)
                test_x0 (sampletests.test122)
                test_y0 (sampletests.test122)
                test_z1 (sampletests.test122)
                testrunner-ex/sampletests/../sampletestsl.txt
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.009 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in 0.000 seconds.
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
            False
        
        if the --verbose (-v) option is used three times, then individual
        test-execution times are printed:
        
            >>> sys.argv = 'test --layer 122 -vvv'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
              Set up samplelayers.Layer122 in 0.000 seconds.
              Running:
                test_x1 (sample1.sampletests.test122.TestA) (0.000 s)
                test_y0 (sample1.sampletests.test122.TestA) (0.000 s)
                test_z0 (sample1.sampletests.test122.TestA) (0.000 s)
                test_x0 (sample1.sampletests.test122.TestB) (0.000 s)
                test_y1 (sample1.sampletests.test122.TestB) (0.000 s)
                test_z0 (sample1.sampletests.test122.TestB) (0.000 s)
                test_1 (sample1.sampletests.test122.TestNotMuch) (0.000 s)
                test_2 (sample1.sampletests.test122.TestNotMuch) (0.000 s)
                test_3 (sample1.sampletests.test122.TestNotMuch) (0.000 s)
                test_x0 (sample1.sampletests.test122) (0.001 s)
                test_y0 (sample1.sampletests.test122) (0.001 s)
                test_z1 (sample1.sampletests.test122) (0.001 s)
                testrunner-ex/sample1/sampletests/../../sampletestsl.txt (0.001 s)
                test_x1 (sampletests.test122.TestA) (0.000 s)
                test_y0 (sampletests.test122.TestA) (0.000 s)
                test_z0 (sampletests.test122.TestA) (0.000 s)
                test_x0 (sampletests.test122.TestB) (0.000 s)
                test_y1 (sampletests.test122.TestB) (0.000 s)
                test_z0 (sampletests.test122.TestB) (0.000 s)
                test_1 (sampletests.test122.TestNotMuch) (0.000 s)
                test_2 (sampletests.test122.TestNotMuch) (0.000 s)
                test_3 (sampletests.test122.TestNotMuch) (0.000 s)
                test_x0 (sampletests.test122) (0.001 s)
                test_y0 (sampletests.test122) (0.001 s)
                test_z1 (sampletests.test122) (0.001 s)
                testrunner-ex/sampletests/../sampletestsl.txt (0.001 s)
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.009 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in 0.000 seconds.
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
            False
        
        Quiet output
        ------------
        
        The --quiet (-q) option cancels all verbose options.  It's useful when
        the default verbosity is non-zero:
        
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     '-v'
            ...     ]
            >>> sys.argv = 'test -q -u'.split()
            >>> testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in 0.034 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Test Selection
        ==============
        
        We've already seen that we can select tests by layer.  There are three
        other ways we can select tests.  We can select tests by package:
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
            >>> sys.argv = 'test --layer 122 -ssample1 -vv'.split()
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
              Set up samplelayers.Layer122 in 0.000 seconds.
              Running:
                test_x1 (sample1.sampletests.test122.TestA)
                test_y0 (sample1.sampletests.test122.TestA)
                test_z0 (sample1.sampletests.test122.TestA)
                test_x0 (sample1.sampletests.test122.TestB)
                test_y1 (sample1.sampletests.test122.TestB)
                test_z0 (sample1.sampletests.test122.TestB)
                test_1 (sample1.sampletests.test122.TestNotMuch)
                test_2 (sample1.sampletests.test122.TestNotMuch)
                test_3 (sample1.sampletests.test122.TestNotMuch)
                test_x0 (sample1.sampletests.test122)
                test_y0 (sample1.sampletests.test122)
                test_z1 (sample1.sampletests.test122)
                testrunner-ex/sample1/sampletests/../../sampletestsl.txt
              Ran 13 tests with 0 failures, 0 errors and 0 skipped in 0.005 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in 0.000 seconds.
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
            False
        
        You can specify multiple packages:
        
            >>> sys.argv = 'test -u  -vv -ssample1 -ssample2'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test_x1 (sample1.sampletestsf.TestA)
             test_y0 (sample1.sampletestsf.TestA)
             test_z0 (sample1.sampletestsf.TestA)
             test_x0 (sample1.sampletestsf.TestB)
             test_y1 (sample1.sampletestsf.TestB)
             test_z0 (sample1.sampletestsf.TestB)
             test_1 (sample1.sampletestsf.TestNotMuch)
             test_2 (sample1.sampletestsf.TestNotMuch)
             test_3 (sample1.sampletestsf.TestNotMuch)
             test_x0 (sample1.sampletestsf)
             test_y0 (sample1.sampletestsf)
             test_z1 (sample1.sampletestsf)
             testrunner-ex/sample1/../sampletests.txt
             test_x1 (sample1.sample11.sampletests.TestA)
             test_y0 (sample1.sample11.sampletests.TestA)
             test_z0 (sample1.sample11.sampletests.TestA)
             test_x0 (sample1.sample11.sampletests.TestB)
             test_y1 (sample1.sample11.sampletests.TestB)
             test_z0 (sample1.sample11.sampletests.TestB)
             test_1 (sample1.sample11.sampletests.TestNotMuch)
             test_2 (sample1.sample11.sampletests.TestNotMuch)
             test_3 (sample1.sample11.sampletests.TestNotMuch)
             test_x0 (sample1.sample11.sampletests)
             test_y0 (sample1.sample11.sampletests)
             test_z1 (sample1.sample11.sampletests)
             testrunner-ex/sample1/sample11/../../sampletests.txt
             test_x1 (sample1.sample13.sampletests.TestA)
             test_y0 (sample1.sample13.sampletests.TestA)
             test_z0 (sample1.sample13.sampletests.TestA)
             test_x0 (sample1.sample13.sampletests.TestB)
             test_y1 (sample1.sample13.sampletests.TestB)
             test_z0 (sample1.sample13.sampletests.TestB)
             test_1 (sample1.sample13.sampletests.TestNotMuch)
             test_2 (sample1.sample13.sampletests.TestNotMuch)
             test_3 (sample1.sample13.sampletests.TestNotMuch)
             test_x0 (sample1.sample13.sampletests)
             test_y0 (sample1.sample13.sampletests)
             test_z1 (sample1.sample13.sampletests)
             testrunner-ex/sample1/sample13/../../sampletests.txt
             test_x1 (sample1.sampletests.test1.TestA)
             test_y0 (sample1.sampletests.test1.TestA)
             test_z0 (sample1.sampletests.test1.TestA)
             test_x0 (sample1.sampletests.test1.TestB)
             test_y1 (sample1.sampletests.test1.TestB)
             test_z0 (sample1.sampletests.test1.TestB)
             test_1 (sample1.sampletests.test1.TestNotMuch)
             test_2 (sample1.sampletests.test1.TestNotMuch)
             test_3 (sample1.sampletests.test1.TestNotMuch)
             test_x0 (sample1.sampletests.test1)
             test_y0 (sample1.sampletests.test1)
             test_z1 (sample1.sampletests.test1)
             testrunner-ex/sample1/sampletests/../../sampletests.txt
             test_x1 (sample1.sampletests.test_one.TestA)
             test_y0 (sample1.sampletests.test_one.TestA)
             test_z0 (sample1.sampletests.test_one.TestA)
             test_x0 (sample1.sampletests.test_one.TestB)
             test_y1 (sample1.sampletests.test_one.TestB)
             test_z0 (sample1.sampletests.test_one.TestB)
             test_1 (sample1.sampletests.test_one.TestNotMuch)
             test_2 (sample1.sampletests.test_one.TestNotMuch)
             test_3 (sample1.sampletests.test_one.TestNotMuch)
             test_x0 (sample1.sampletests.test_one)
             test_y0 (sample1.sampletests.test_one)
             test_z1 (sample1.sampletests.test_one)
             testrunner-ex/sample1/sampletests/../../sampletests.txt
             test_x1 (sample2.sample21.sampletests.TestA)
             test_y0 (sample2.sample21.sampletests.TestA)
             test_z0 (sample2.sample21.sampletests.TestA)
             test_x0 (sample2.sample21.sampletests.TestB)
             test_y1 (sample2.sample21.sampletests.TestB)
             test_z0 (sample2.sample21.sampletests.TestB)
             test_1 (sample2.sample21.sampletests.TestNotMuch)
             test_2 (sample2.sample21.sampletests.TestNotMuch)
             test_3 (sample2.sample21.sampletests.TestNotMuch)
             test_x0 (sample2.sample21.sampletests)
             test_y0 (sample2.sample21.sampletests)
             test_z1 (sample2.sample21.sampletests)
             testrunner-ex/sample2/sample21/../../sampletests.txt
             test_x1 (sample2.sampletests.test_1.TestA)
             test_y0 (sample2.sampletests.test_1.TestA)
             test_z0 (sample2.sampletests.test_1.TestA)
             test_x0 (sample2.sampletests.test_1.TestB)
             test_y1 (sample2.sampletests.test_1.TestB)
             test_z0 (sample2.sampletests.test_1.TestB)
             test_1 (sample2.sampletests.test_1.TestNotMuch)
             test_2 (sample2.sampletests.test_1.TestNotMuch)
             test_3 (sample2.sampletests.test_1.TestNotMuch)
             test_x0 (sample2.sampletests.test_1)
             test_y0 (sample2.sampletests.test_1)
             test_z1 (sample2.sampletests.test_1)
             testrunner-ex/sample2/sampletests/../../sampletests.txt
             test_x1 (sample2.sampletests.testone.TestA)
             test_y0 (sample2.sampletests.testone.TestA)
             test_z0 (sample2.sampletests.testone.TestA)
             test_x0 (sample2.sampletests.testone.TestB)
             test_y1 (sample2.sampletests.testone.TestB)
             test_z0 (sample2.sampletests.testone.TestB)
             test_1 (sample2.sampletests.testone.TestNotMuch)
             test_2 (sample2.sampletests.testone.TestNotMuch)
             test_3 (sample2.sampletests.testone.TestNotMuch)
             test_x0 (sample2.sampletests.testone)
             test_y0 (sample2.sampletests.testone)
             test_z1 (sample2.sampletests.testone)
             testrunner-ex/sample2/sampletests/../../sampletests.txt
              Ran 104 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        You can specify directory names instead of packages (useful for
        tab-completion):
        
            >>> subdir = os.path.join(directory_with_tests, 'sample1')
            >>> sys.argv = ['test', '--layer', '122', '-s', subdir, '-vv']
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
              Set up samplelayers.Layer122 in 0.000 seconds.
              Running:
                test_x1 (sample1.sampletests.test122.TestA)
                test_y0 (sample1.sampletests.test122.TestA)
                test_z0 (sample1.sampletests.test122.TestA)
                test_x0 (sample1.sampletests.test122.TestB)
                test_y1 (sample1.sampletests.test122.TestB)
                test_z0 (sample1.sampletests.test122.TestB)
                test_1 (sample1.sampletests.test122.TestNotMuch)
                test_2 (sample1.sampletests.test122.TestNotMuch)
                test_3 (sample1.sampletests.test122.TestNotMuch)
                test_x0 (sample1.sampletests.test122)
                test_y0 (sample1.sampletests.test122)
                test_z1 (sample1.sampletests.test122)
                testrunner-ex/sample1/sampletests/../../sampletestsl.txt
              Ran 13 tests with 0 failures, 0 errors and 0 skipped in 0.005 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in 0.000 seconds.
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
            False
        
        We can select by test module name using the --module (-m) option:
        
            >>> sys.argv = 'test -u  -vv -ssample1 -m_one -mtest1'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test_x1 (sample1.sampletests.test1.TestA)
             test_y0 (sample1.sampletests.test1.TestA)
             test_z0 (sample1.sampletests.test1.TestA)
             test_x0 (sample1.sampletests.test1.TestB)
             test_y1 (sample1.sampletests.test1.TestB)
             test_z0 (sample1.sampletests.test1.TestB)
             test_1 (sample1.sampletests.test1.TestNotMuch)
             test_2 (sample1.sampletests.test1.TestNotMuch)
             test_3 (sample1.sampletests.test1.TestNotMuch)
             test_x0 (sample1.sampletests.test1)
             test_y0 (sample1.sampletests.test1)
             test_z1 (sample1.sampletests.test1)
             testrunner-ex/sample1/sampletests/../../sampletests.txt
             test_x1 (sample1.sampletests.test_one.TestA)
             test_y0 (sample1.sampletests.test_one.TestA)
             test_z0 (sample1.sampletests.test_one.TestA)
             test_x0 (sample1.sampletests.test_one.TestB)
             test_y1 (sample1.sampletests.test_one.TestB)
             test_z0 (sample1.sampletests.test_one.TestB)
             test_1 (sample1.sampletests.test_one.TestNotMuch)
             test_2 (sample1.sampletests.test_one.TestNotMuch)
             test_3 (sample1.sampletests.test_one.TestNotMuch)
             test_x0 (sample1.sampletests.test_one)
             test_y0 (sample1.sampletests.test_one)
             test_z1 (sample1.sampletests.test_one)
             testrunner-ex/sample1/sampletests/../../sampletests.txt
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        and by test within the module using the --test (-t) option:
        
            >>> sys.argv = 'test -u  -vv -ssample1 -m_one -mtest1 -tx0 -ty0'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test_y0 (sample1.sampletests.test1.TestA)
             test_x0 (sample1.sampletests.test1.TestB)
             test_x0 (sample1.sampletests.test1)
             test_y0 (sample1.sampletests.test1)
             test_y0 (sample1.sampletests.test_one.TestA)
             test_x0 (sample1.sampletests.test_one.TestB)
             test_x0 (sample1.sampletests.test_one)
             test_y0 (sample1.sampletests.test_one)
              Ran 8 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
            >>> sys.argv = 'test -u  -vv -ssample1 -ttxt'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             testrunner-ex/sample1/../sampletests.txt
             testrunner-ex/sample1/sample11/../../sampletests.txt
             testrunner-ex/sample1/sample13/../../sampletests.txt
             testrunner-ex/sample1/sampletests/../../sampletests.txt
             testrunner-ex/sample1/sampletests/../../sampletests.txt
              Ran 5 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        The --module and --test options take regular expressions.  If the
        regular expressions specified begin with '!', then tests that don't
        match the regular expression are selected:
        
            >>> sys.argv = 'test -u  -vv -ssample1 -m!sample1[.]sample1'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test_x1 (sample1.sampletestsf.TestA)
             test_y0 (sample1.sampletestsf.TestA)
             test_z0 (sample1.sampletestsf.TestA)
             test_x0 (sample1.sampletestsf.TestB)
             test_y1 (sample1.sampletestsf.TestB)
             test_z0 (sample1.sampletestsf.TestB)
             test_1 (sample1.sampletestsf.TestNotMuch)
             test_2 (sample1.sampletestsf.TestNotMuch)
             test_3 (sample1.sampletestsf.TestNotMuch)
             test_x0 (sample1.sampletestsf)
             test_y0 (sample1.sampletestsf)
             test_z1 (sample1.sampletestsf)
             testrunner-ex/sample1/../sampletests.txt
             test_x1 (sample1.sampletests.test1.TestA)
             test_y0 (sample1.sampletests.test1.TestA)
             test_z0 (sample1.sampletests.test1.TestA)
             test_x0 (sample1.sampletests.test1.TestB)
             test_y1 (sample1.sampletests.test1.TestB)
             test_z0 (sample1.sampletests.test1.TestB)
             test_1 (sample1.sampletests.test1.TestNotMuch)
             test_2 (sample1.sampletests.test1.TestNotMuch)
             test_3 (sample1.sampletests.test1.TestNotMuch)
             test_x0 (sample1.sampletests.test1)
             test_y0 (sample1.sampletests.test1)
             test_z1 (sample1.sampletests.test1)
             testrunner-ex/sample1/sampletests/../../sampletests.txt
             test_x1 (sample1.sampletests.test_one.TestA)
             test_y0 (sample1.sampletests.test_one.TestA)
             test_z0 (sample1.sampletests.test_one.TestA)
             test_x0 (sample1.sampletests.test_one.TestB)
             test_y1 (sample1.sampletests.test_one.TestB)
             test_z0 (sample1.sampletests.test_one.TestB)
             test_1 (sample1.sampletests.test_one.TestNotMuch)
             test_2 (sample1.sampletests.test_one.TestNotMuch)
             test_3 (sample1.sampletests.test_one.TestNotMuch)
             test_x0 (sample1.sampletests.test_one)
             test_y0 (sample1.sampletests.test_one)
             test_z1 (sample1.sampletests.test_one)
             testrunner-ex/sample1/sampletests/../../sampletests.txt
              Ran 39 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        Module and test filters can also be given as positional arguments:
        
        
            >>> sys.argv = 'test -u  -vv -ssample1 !sample1[.]sample1'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test_x1 (sample1.sampletestsf.TestA)
             test_y0 (sample1.sampletestsf.TestA)
             test_z0 (sample1.sampletestsf.TestA)
             test_x0 (sample1.sampletestsf.TestB)
             test_y1 (sample1.sampletestsf.TestB)
             test_z0 (sample1.sampletestsf.TestB)
             test_1 (sample1.sampletestsf.TestNotMuch)
             test_2 (sample1.sampletestsf.TestNotMuch)
             test_3 (sample1.sampletestsf.TestNotMuch)
             test_x0 (sample1.sampletestsf)
             test_y0 (sample1.sampletestsf)
             test_z1 (sample1.sampletestsf)
             testrunner-ex/sample1/../sampletests.txt
             test_x1 (sample1.sampletests.test1.TestA)
             test_y0 (sample1.sampletests.test1.TestA)
             test_z0 (sample1.sampletests.test1.TestA)
             test_x0 (sample1.sampletests.test1.TestB)
             test_y1 (sample1.sampletests.test1.TestB)
             test_z0 (sample1.sampletests.test1.TestB)
             test_1 (sample1.sampletests.test1.TestNotMuch)
             test_2 (sample1.sampletests.test1.TestNotMuch)
             test_3 (sample1.sampletests.test1.TestNotMuch)
             test_x0 (sample1.sampletests.test1)
             test_y0 (sample1.sampletests.test1)
             test_z1 (sample1.sampletests.test1)
             testrunner-ex/sample1/sampletests/../../sampletests.txt
             test_x1 (sample1.sampletests.test_one.TestA)
             test_y0 (sample1.sampletests.test_one.TestA)
             test_z0 (sample1.sampletests.test_one.TestA)
             test_x0 (sample1.sampletests.test_one.TestB)
             test_y1 (sample1.sampletests.test_one.TestB)
             test_z0 (sample1.sampletests.test_one.TestB)
             test_1 (sample1.sampletests.test_one.TestNotMuch)
             test_2 (sample1.sampletests.test_one.TestNotMuch)
             test_3 (sample1.sampletests.test_one.TestNotMuch)
             test_x0 (sample1.sampletests.test_one)
             test_y0 (sample1.sampletests.test_one)
             test_z1 (sample1.sampletests.test_one)
             testrunner-ex/sample1/sampletests/../../sampletests.txt
              Ran 39 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
            >>> sys.argv = 'test -u  -vv -ssample1 . txt'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             testrunner-ex/sample1/../sampletests.txt
             testrunner-ex/sample1/sample11/../../sampletests.txt
             testrunner-ex/sample1/sample13/../../sampletests.txt
             testrunner-ex/sample1/sampletests/../../sampletests.txt
             testrunner-ex/sample1/sampletests/../../sampletests.txt
              Ran 5 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Sometimes, There are tests that you don't want to run by default.
        For example, you might have tests that take a long time.  Tests can
        have a level attribute.  If no level is specified, a level of 1 is
        assumed and, by default, only tests at level one are run.  to run
        tests at a higher level, use the --at-level (-a) option to specify a higher
        level.  For example, with the following options:
        
        
            >>> sys.argv = 'test -u  -vv -t test_y1 -t test_y0'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test_y0 (sampletestsf.TestA)
             test_y1 (sampletestsf.TestB)
             test_y0 (sampletestsf)
             test_y0 (sample1.sampletestsf.TestA)
             test_y1 (sample1.sampletestsf.TestB)
             test_y0 (sample1.sampletestsf)
             test_y0 (sample1.sample11.sampletests.TestA)
             test_y1 (sample1.sample11.sampletests.TestB)
             test_y0 (sample1.sample11.sampletests)
             test_y0 (sample1.sample13.sampletests.TestA)
             test_y1 (sample1.sample13.sampletests.TestB)
             test_y0 (sample1.sample13.sampletests)
             test_y0 (sample1.sampletests.test1.TestA)
             test_y1 (sample1.sampletests.test1.TestB)
             test_y0 (sample1.sampletests.test1)
             test_y0 (sample1.sampletests.test_one.TestA)
             test_y1 (sample1.sampletests.test_one.TestB)
             test_y0 (sample1.sampletests.test_one)
             test_y0 (sample2.sample21.sampletests.TestA)
             test_y1 (sample2.sample21.sampletests.TestB)
             test_y0 (sample2.sample21.sampletests)
             test_y0 (sample2.sampletests.test_1.TestA)
             test_y1 (sample2.sampletests.test_1.TestB)
             test_y0 (sample2.sampletests.test_1)
             test_y0 (sample2.sampletests.testone.TestA)
             test_y1 (sample2.sampletests.testone.TestB)
             test_y0 (sample2.sampletests.testone)
             test_y0 (sample3.sampletests.TestA)
             test_y1 (sample3.sampletests.TestB)
             test_y0 (sample3.sampletests)
             test_y0 (sampletests.test1.TestA)
             test_y1 (sampletests.test1.TestB)
             test_y0 (sampletests.test1)
             test_y0 (sampletests.test_one.TestA)
             test_y1 (sampletests.test_one.TestB)
             test_y0 (sampletests.test_one)
              Ran 36 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        We get run 36 tests.  If we specify a level of 2, we get some
        additional tests:
        
            >>> sys.argv = 'test -u  -vv -a 2 -t test_y1 -t test_y0'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 2
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test_y0 (sampletestsf.TestA)
             test_y0 (sampletestsf.TestA2)
             test_y1 (sampletestsf.TestB)
             test_y0 (sampletestsf)
             test_y0 (sample1.sampletestsf.TestA)
             test_y1 (sample1.sampletestsf.TestB)
             test_y0 (sample1.sampletestsf)
             test_y0 (sample1.sample11.sampletests.TestA)
             test_y1 (sample1.sample11.sampletests.TestB)
             test_y1 (sample1.sample11.sampletests.TestB2)
             test_y0 (sample1.sample11.sampletests)
             test_y0 (sample1.sample13.sampletests.TestA)
             test_y1 (sample1.sample13.sampletests.TestB)
             test_y0 (sample1.sample13.sampletests)
             test_y0 (sample1.sampletests.test1.TestA)
             test_y1 (sample1.sampletests.test1.TestB)
             test_y0 (sample1.sampletests.test1)
             test_y0 (sample1.sampletests.test_one.TestA)
             test_y1 (sample1.sampletests.test_one.TestB)
             test_y0 (sample1.sampletests.test_one)
             test_y0 (sample2.sample21.sampletests.TestA)
             test_y1 (sample2.sample21.sampletests.TestB)
             test_y0 (sample2.sample21.sampletests)
             test_y0 (sample2.sampletests.test_1.TestA)
             test_y1 (sample2.sampletests.test_1.TestB)
             test_y0 (sample2.sampletests.test_1)
             test_y0 (sample2.sampletests.testone.TestA)
             test_y1 (sample2.sampletests.testone.TestB)
             test_y0 (sample2.sampletests.testone)
             test_y0 (sample3.sampletests.TestA)
             test_y1 (sample3.sampletests.TestB)
             test_y0 (sample3.sampletests)
             test_y0 (sampletests.test1.TestA)
             test_y1 (sampletests.test1.TestB)
             test_y0 (sampletests.test1)
             test_y0 (sampletests.test_one.TestA)
             test_y1 (sampletests.test_one.TestB)
             test_y0 (sampletests.test_one)
              Ran 38 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        We can use the --all option to run tests at all levels:
        
            >>> sys.argv = 'test -u  -vv --all -t test_y1 -t test_y0'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at all levels
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test_y0 (sampletestsf.TestA)
             test_y0 (sampletestsf.TestA2)
             test_y1 (sampletestsf.TestB)
             test_y0 (sampletestsf)
             test_y0 (sample1.sampletestsf.TestA)
             test_y1 (sample1.sampletestsf.TestB)
             test_y0 (sample1.sampletestsf)
             test_y0 (sample1.sample11.sampletests.TestA)
             test_y0 (sample1.sample11.sampletests.TestA3)
             test_y1 (sample1.sample11.sampletests.TestB)
             test_y1 (sample1.sample11.sampletests.TestB2)
             test_y0 (sample1.sample11.sampletests)
             test_y0 (sample1.sample13.sampletests.TestA)
             test_y1 (sample1.sample13.sampletests.TestB)
             test_y0 (sample1.sample13.sampletests)
             test_y0 (sample1.sampletests.test1.TestA)
             test_y1 (sample1.sampletests.test1.TestB)
             test_y0 (sample1.sampletests.test1)
             test_y0 (sample1.sampletests.test_one.TestA)
             test_y1 (sample1.sampletests.test_one.TestB)
             test_y0 (sample1.sampletests.test_one)
             test_y0 (sample2.sample21.sampletests.TestA)
             test_y1 (sample2.sample21.sampletests.TestB)
             test_y0 (sample2.sample21.sampletests)
             test_y0 (sample2.sampletests.test_1.TestA)
             test_y1 (sample2.sampletests.test_1.TestB)
             test_y0 (sample2.sampletests.test_1)
             test_y0 (sample2.sampletests.testone.TestA)
             test_y1 (sample2.sampletests.testone.TestB)
             test_y0 (sample2.sampletests.testone)
             test_y0 (sample3.sampletests.TestA)
             test_y1 (sample3.sampletests.TestB)
             test_y0 (sample3.sampletests)
             test_y0 (sampletests.test1.TestA)
             test_y1 (sampletests.test1.TestB)
             test_y0 (sampletests.test1)
             test_y0 (sampletests.test_one.TestA)
             test_y1 (sampletests.test_one.TestB)
             test_y0 (sampletests.test_one)
              Ran 39 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        Listing Selected Tests
        ----------------------
        
        When you're trying to figure out why the test you want is not matched by the
        pattern you specified, it is convenient to see which tests match your
        specifications.
        
            >>> sys.argv = 'test --all -m sample1 -t test_y0 --list-tests'.split()
            >>> testrunner.run_internal(defaults)
            Listing samplelayers.Layer11 tests:
              test_y0 (sample1.sampletests.test11.TestA)
              test_y0 (sample1.sampletests.test11)
            Listing samplelayers.Layer111 tests:
              test_y0 (sample1.sampletests.test111.TestA)
              test_y0 (sample1.sampletests.test111)
            Listing samplelayers.Layer112 tests:
              test_y0 (sample1.sampletests.test112.TestA)
              test_y0 (sample1.sampletests.test112)
            Listing samplelayers.Layer12 tests:
              test_y0 (sample1.sampletests.test12.TestA)
              test_y0 (sample1.sampletests.test12)
            Listing samplelayers.Layer121 tests:
              test_y0 (sample1.sampletests.test121.TestA)
              test_y0 (sample1.sampletests.test121)
            Listing samplelayers.Layer122 tests:
              test_y0 (sample1.sampletests.test122.TestA)
              test_y0 (sample1.sampletests.test122)
            Listing zope.testrunner.layer.UnitTests tests:
              test_y0 (sample1.sampletestsf.TestA)
              test_y0 (sample1.sampletestsf)
              test_y0 (sample1.sample11.sampletests.TestA)
              test_y0 (sample1.sample11.sampletests.TestA3)
              test_y0 (sample1.sample11.sampletests)
              test_y0 (sample1.sample13.sampletests.TestA)
              test_y0 (sample1.sample13.sampletests)
              test_y0 (sample1.sampletests.test1.TestA)
              test_y0 (sample1.sampletests.test1)
              test_y0 (sample1.sampletests.test_one.TestA)
              test_y0 (sample1.sampletests.test_one)
            False
        
        Test Progress
        =============
        
        If the --progress (-p) option is used, progress information is printed and
        a carriage return (rather than a new-line) is printed between
        detail lines.  Let's look at the effect of --progress (-p) at different
        levels of verbosity.
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
            >>> sys.argv = 'test --layer 122 -p'.split()
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults)
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer12 in N.NNN seconds.
              Set up samplelayers.Layer122 in N.NNN seconds.
              Running:
                1/26 (3.8%)##r##
                           ##r##
                2/26 (7.7%)##r##
                           ##r##
                3/26 (11.5%)##r##
                            ##r##
                4/26 (15.4%)##r##
                            ##r##
                5/26 (19.2%)##r##
                            ##r##
                6/26 (23.1%)##r##
                            ##r##
                7/26 (26.9%)##r##
                            ##r##
                8/26 (30.8%)##r##
                            ##r##
                9/26 (34.6%)##r##
                            ##r##
                10/26 (38.5%)##r##
                             ##r##
                11/26 (42.3%)##r##
                             ##r##
                12/26 (46.2%)##r##
                             ##r##
                13/26 (50.0%)##r##
                             ##r##
                14/26 (53.8%)##r##
                             ##r##
                15/26 (57.7%)##r##
                             ##r##
                16/26 (61.5%)##r##
                             ##r##
                17/26 (65.4%)##r##
                             ##r##
                18/26 (69.2%)##r##
                             ##r##
                19/26 (73.1%)##r##
                             ##r##
                20/26 (76.9%)##r##
                             ##r##
                21/26 (80.8%)##r##
                             ##r##
                22/26 (84.6%)##r##
                             ##r##
                23/26 (88.5%)##r##
                             ##r##
                24/26 (92.3%)##r##
                             ##r##
                25/26 (96.2%)##r##
                             ##r##
                26/26 (100.0%)##r##
                              ##r##
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            False
        
        
        (Note that, in the examples above and below, we show "##r##" followed by
        new lines where carriage returns would appear in actual output.)
        
        Using a single level of verbosity causes test descriptions to be
        output, but only if they fit in the terminal width.  The default
        width, when the terminal width can't be determined, is 80:
        
            >>> sys.argv = 'test --layer 122 -pv'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer12 in N.NNN seconds.
              Set up samplelayers.Layer122 in N.NNN seconds.
              Running:
                1/26 (3.8%) test_x1 (sample1.sampletests.test122.TestA)##r##
                                                                       ##r##
                2/26 (7.7%) test_y0 (sample1.sampletests.test122.TestA)##r##
                                                                       ##r##
                3/26 (11.5%) test_z0 (sample1.sampletests.test122.TestA)##r##
                                                                        ##r##
                4/26 (15.4%) test_x0 (sample1.sampletests.test122.TestB)##r##
                                                                        ##r##
                5/26 (19.2%) test_y1 (sample1.sampletests.test122.TestB)##r##
                                                                        ##r##
                6/26 (23.1%) test_z0 (sample1.sampletests.test122.TestB)##r##
                                                                        ##r##
                7/26 (26.9%) test_1 (sample1.sampletests.test122.TestNotMuch)##r##
                                                                             ##r##
                8/26 (30.8%) test_2 (sample1.sampletests.test122.TestNotMuch)##r##
                                                                             ##r##
                9/26 (34.6%) test_3 (sample1.sampletests.test122.TestNotMuch)##r##
                                                                             ##r##
                10/26 (38.5%) test_x0 (sample1.sampletests.test122)##r##
                                                                   ##r##
                11/26 (42.3%) test_y0 (sample1.sampletests.test122)##r##
                                                                   ##r##
                12/26 (46.2%) test_z1 (sample1.sampletests.test122)##r##
                                                                   ##r##
             testrunner-ex/sample1/sampletests/../../sampletestsl.txt##r##
                                                                                           ##r##
                14/26 (53.8%) test_x1 (sampletests.test122.TestA)##r##
                                                                 ##r##
                15/26 (57.7%) test_y0 (sampletests.test122.TestA)##r##
                                                                 ##r##
                16/26 (61.5%) test_z0 (sampletests.test122.TestA)##r##
                                                                 ##r##
                17/26 (65.4%) test_x0 (sampletests.test122.TestB)##r##
                                                                 ##r##
                18/26 (69.2%) test_y1 (sampletests.test122.TestB)##r##
                                                                 ##r##
                19/26 (73.1%) test_z0 (sampletests.test122.TestB)##r##
                                                                 ##r##
                20/26 (76.9%) test_1 (sampletests.test122.TestNotMuch)##r##
                                                                      ##r##
                21/26 (80.8%) test_2 (sampletests.test122.TestNotMuch)##r##
                                                                      ##r##
                22/26 (84.6%) test_3 (sampletests.test122.TestNotMuch)##r##
                                                                      ##r##
                23/26 (88.5%) test_x0 (sampletests.test122)##r##
                                                           ##r##
                24/26 (92.3%) test_y0 (sampletests.test122)##r##
                                                           ##r##
                25/26 (96.2%) test_z1 (sampletests.test122)##r##
                                                           ##r##
             testrunner-ex/sampletests/../sampletestsl.txt##r##
                                                                                           ##r##
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            False
        
        
        The terminal width is determined using the curses module.  To see
        that, we'll provide a fake curses module:
        
            >>> class FakeCurses:
            ...     class error(Exception):
            ...         pass
            ...     def setupterm(self):
            ...         pass
            ...     def tigetnum(self, ignored):
            ...         return 60
            >>> old_curses = sys.modules.get('curses')
            >>> sys.modules['curses'] = FakeCurses()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in N.NNN seconds.
              Set up samplelayers.Layer12 in N.NNN seconds.
              Set up samplelayers.Layer122 in N.NNN seconds.
              Running:
                1/26 (3.8%) test_x1 (sample1.sampletests.test122.TestA)##r##
                                                                       ##r##
                2/26 (7.7%) test_y0 (sample1.sampletests.test122.TestA)##r##
                                                                       ##r##
                3/26 (11.5%) test_z0 (...le1.sampletests.test122.TestA)##r##
                                                                       ##r##
                4/26 (15.4%) test_x0 (...le1.sampletests.test122.TestB)##r##
                                                                       ##r##
                5/26 (19.2%) test_y1 (...le1.sampletests.test122.TestB)##r##
                                                                       ##r##
                6/26 (23.1%) test_z0 (...le1.sampletests.test122.TestB)##r##
                                                                       ##r##
                7/26 (26.9%) test_1 (...ampletests.test122.TestNotMuch)##r##
                                                                       ##r##
                8/26 (30.8%) test_2 (...ampletests.test122.TestNotMuch)##r##
                                                                       ##r##
                9/26 (34.6%) test_3 (...ampletests.test122.TestNotMuch)##r##
                                                                       ##r##
                10/26 (38.5%) test_x0 (sample1.sampletests.test122)##r##
                                                                   ##r##
                11/26 (42.3%) test_y0 (sample1.sampletests.test122)##r##
                                                                   ##r##
                12/26 (46.2%) test_z1 (sample1.sampletests.test122)##r##
                                                                   ##r##
                13/26 (50.0%) ... e1/sampletests/../../sampletestsl.txt##r##
                                                                       ##r##
                14/26 (53.8%) test_x1 (sampletests.test122.TestA)##r##
                                                                 ##r##
                15/26 (57.7%) test_y0 (sampletests.test122.TestA)##r##
                                                                 ##r##
                16/26 (61.5%) test_z0 (sampletests.test122.TestA)##r##
                                                                 ##r##
                17/26 (65.4%) test_x0 (sampletests.test122.TestB)##r##
                                                                 ##r##
                18/26 (69.2%) test_y1 (sampletests.test122.TestB)##r##
                                                                 ##r##
                19/26 (73.1%) test_z0 (sampletests.test122.TestB)##r##
                                                                 ##r##
                20/26 (76.9%) test_1 (sampletests.test122.TestNotMuch)##r##
                                                                      ##r##
                21/26 (80.8%) test_2 (sampletests.test122.TestNotMuch)##r##
                                                                      ##r##
                22/26 (84.6%) test_3 (sampletests.test122.TestNotMuch)##r##
                                                                      ##r##
                23/26 (88.5%) test_x0 (sampletests.test122)##r##
                                                           ##r##
                24/26 (92.3%) test_y0 (sampletests.test122)##r##
                                                           ##r##
                25/26 (96.2%) test_z1 (sampletests.test122)##r##
                                                           ##r##
                26/26 (100.0%) ... r-ex/sampletests/../sampletestsl.txt##r##
                                                                       ##r##
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
            False
        
            >>> sys.modules['curses'] = old_curses
        
        If a second or third level of verbosity are added, we get additional
        information.
        
            >>> sys.argv = 'test --layer 122 -pvv -t !txt'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
              Set up samplelayers.Layer122 in 0.000 seconds.
              Running:
                1/24 (4.2%) test_x1 (sample1.sampletests.test122.TestA)##r##
                                                                      ##r##
                2/24 (8.3%) test_y0 (sample1.sampletests.test122.TestA)##r##
                                                                      ##r##
                3/24 (12.5%) test_z0 (sample1.sampletests.test122.TestA)##r##
                                                                       ##r##
                4/24 (16.7%) test_x0 (sample1.sampletests.test122.TestB)##r##
                                                                       ##r##
                5/24 (20.8%) test_y1 (sample1.sampletests.test122.TestB)##r##
                                                                       ##r##
                6/24 (25.0%) test_z0 (sample1.sampletests.test122.TestB)##r##
                                                                       ##r##
                7/24 (29.2%) test_1 (sample1.sampletests.test122.TestNotMuch)##r##
                                                                            ##r##
                8/24 (33.3%) test_2 (sample1.sampletests.test122.TestNotMuch)##r##
                                                                            ##r##
                9/24 (37.5%) test_3 (sample1.sampletests.test122.TestNotMuch)##r##
                                                                            ##r##
                10/24 (41.7%) test_x0 (sample1.sampletests.test122)##r##
                                                                  ##r##
                11/24 (45.8%) test_y0 (sample1.sampletests.test122)##r##
                                                                  ##r##
                12/24 (50.0%) test_z1 (sample1.sampletests.test122)##r##
                                                                  ##r##
                13/24 (54.2%) test_x1 (sampletests.test122.TestA)##r##
                                                                ##r##
                14/24 (58.3%) test_y0 (sampletests.test122.TestA)##r##
                                                                ##r##
                15/24 (62.5%) test_z0 (sampletests.test122.TestA)##r##
                                                                ##r##
                16/24 (66.7%) test_x0 (sampletests.test122.TestB)##r##
                                                                ##r##
                17/24 (70.8%) test_y1 (sampletests.test122.TestB)##r##
                                                                ##r##
                18/24 (75.0%) test_z0 (sampletests.test122.TestB)##r##
                                                                ##r##
                19/24 (79.2%) test_1 (sampletests.test122.TestNotMuch)##r##
                                                                     ##r##
                20/24 (83.3%) test_2 (sampletests.test122.TestNotMuch)##r##
                                                                     ##r##
                21/24 (87.5%) test_3 (sampletests.test122.TestNotMuch)##r##
                                                                     ##r##
                22/24 (91.7%) test_x0 (sampletests.test122)##r##
                                                          ##r##
                23/24 (95.8%) test_y0 (sampletests.test122)##r##
                                                          ##r##
                24/24 (100.0%) test_z1 (sampletests.test122)##r##
                                                           ##r##
              Ran 24 tests with 0 failures, 0 errors and 0 skipped in 0.006 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in 0.000 seconds.
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
            False
        
        Note that, in this example, we used a test-selection pattern starting
        with '!' to exclude tests containing the string "txt".
        
            >>> sys.argv = 'test --layer 122 -pvvv -t!(txt|NotMuch)'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer122 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
              Set up samplelayers.Layer122 in 0.000 seconds.
              Running:
                1/18 (5.6%) test_x1 (sample1.sampletests.test122.TestA) (0.000 s)##r##
                                                                                  ##r##
                2/18 (11.1%) test_y0 (sample1.sampletests.test122.TestA) (0.000 s)##r##
                                                                                   ##r##
                3/18 (16.7%) test_z0 (sample1.sampletests.test122.TestA) (0.000 s)##r##
                                                                                   ##r##
                4/18 (22.2%) test_x0 (sample1.sampletests.test122.TestB) (0.000 s)##r##
                                                                                   ##r##
                5/18 (27.8%) test_y1 (sample1.sampletests.test122.TestB) (0.000 s)##r##
                                                                                   ##r##
                6/18 (33.3%) test_z0 (sample1.sampletests.test122.TestB) (0.000 s)##r##
                                                                                   ##r##
                7/18 (38.9%) test_x0 (sample1.sampletests.test122) (0.001 s)##r##
                                                                             ##r##
                8/18 (44.4%) test_y0 (sample1.sampletests.test122) (0.001 s)##r##
                                                                             ##r##
                9/18 (50.0%) test_z1 (sample1.sampletests.test122) (0.001 s)##r##
                                                                             ##r##
                10/18 (55.6%) test_x1 (sampletests.test122.TestA) (0.000 s)##r##
                                                                            ##r##
                11/18 (61.1%) test_y0 (sampletests.test122.TestA) (0.000 s)##r##
                                                                            ##r##
                12/18 (66.7%) test_z0 (sampletests.test122.TestA) (0.000 s)##r##
                                                                            ##r##
                13/18 (72.2%) test_x0 (sampletests.test122.TestB) (0.000 s)##r##
                                                                            ##r##
                14/18 (77.8%) test_y1 (sampletests.test122.TestB) (0.000 s)##r##
                                                                            ##r##
                15/18 (83.3%) test_z0 (sampletests.test122.TestB) (0.000 s)##r##
                                                                            ##r##
                16/18 (88.9%) test_x0 (sampletests.test122) (0.001 s)##r##
                                                                      ##r##
                17/18 (94.4%) test_y0 (sampletests.test122) (0.001 s)##r##
                                                                      ##r##
                18/18 (100.0%) test_z1 (sampletests.test122) (0.001 s)##r##
                                                                       ##r##
              Ran 18 tests with 0 failures, 0 errors and 0 skipped in 0.006 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in 0.000 seconds.
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
            False
        
        In this example, we also excluded tests with "NotMuch" in their names.
        
        Unfortunately, the time data above doesn't buy us much because, in
        practice, the line is cleared before there is time to see the
        times. :/
        
        
        Autodetecting progress
        ----------------------
        
        The --auto-progress option will determine if stdout is a terminal, and only enable
        progress output if so.
        
        Let's pretend we have a terminal
        
            >>> class Terminal(object):
            ...     def __init__(self, stream):
            ...         self._stream = stream
            ...     def __getattr__(self, attr):
            ...         return getattr(self._stream, attr)
            ...     def isatty(self):
            ...         return True
            >>> real_stdout = sys.stdout
            >>> sys.stdout = Terminal(sys.stdout)
        
            >>> sys.argv = 'test -u -t test_one.TestNotMuch --auto-progress'.split()
            >>> testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
                1/6 (16.7%)##r##
                           ##r##
                2/6 (33.3%)##r##
                           ##r##
                3/6 (50.0%)##r##
                           ##r##
                4/6 (66.7%)##r##
                           ##r##
                5/6 (83.3%)##r##
                           ##r##
                6/6 (100.0%)##r##
                            ##r##
              Ran 6 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        Let's stop pretending
        
            >>> sys.stdout = real_stdout
        
            >>> sys.argv = 'test -u -t test_one.TestNotMuch --auto-progress'.split()
            >>> testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 6 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        Disabling progress indication
        -----------------------------
        
        If -p or --progress have been previously provided on the command line (perhaps by a
        wrapper script) but you do not desire progress indication, you can switch it off with
        --no-progress:
        
            >>> sys.argv = 'test -u -t test_one.TestNotMuch -p --no-progress'.split()
            >>> testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 6 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Debugging
        =========
        
        The testrunner module supports post-mortem debugging and debugging
        using `pdb.set_trace`.  Let's look first at using `pdb.set_trace`.
        To demonstrate this, we'll provide input via helper Input objects:
        
            >>> class Input:
            ...     def __init__(self, src):
            ...         self.lines = src.split('\n')
            ...     def readline(self):
            ...         line = self.lines.pop(0)
            ...         print(line)
            ...         return line+'\n'
        
        If a test or code called by a test calls pdb.set_trace, then the
        runner will enter pdb at that point:
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> from zope import testrunner
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
            >>> real_stdin = sys.stdin
            >>> sys.stdin = Input('p x\nc')
        
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t set_trace1').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +ELLIPSIS
            Running zope.testrunner.layer.UnitTests tests:
            ...
            > testrunner-ex/sample3/sampletests_d.py(27)test_set_trace1()
            -> y = x
            (Pdb) p x
            1
            (Pdb) c
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.001 seconds.
            ...
            False
        
        Note that, prior to Python 2.4, calling pdb.set_trace caused pdb to
        break in the pdb.set_trace function.  It was necessary to use 'next'
        or 'up' to get to the application code that called pdb.set_trace.  In
        Python 2.4, pdb.set_trace causes pdb to stop right after the call to
        pdb.set_trace.
        
        You can also do post-mortem debugging, using the --post-mortem (-D)
        option:
        
            >>> sys.stdin = Input('p x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t post_mortem1 -D').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +NORMALIZE_WHITESPACE +REPORT_NDIFF +ELLIPSIS
            Running zope.testrunner.layer.UnitTests tests:
            ...
            Error in test test_post_mortem1 (sample3.sampletests_d.TestSomething)
            Traceback (most recent call last):
              File "testrunner-ex/sample3/sampletests_d.py",
                      line 34, in test_post_mortem1
                raise ValueError
            ValueError
            <BLANKLINE>
            ...ValueError
            <BLANKLINE>
            > testrunner-ex/sample3/sampletests_d.py(34)test_post_mortem1()
            -> raise ValueError
            (Pdb) p x
            1
            (Pdb) c
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Note that the test runner exits after post-mortem debugging.
        
        In the example above, we debugged an error.  Failures are actually
        converted to errors and can be debugged the same way:
        
            >>> sys.stdin = Input('p x\np y\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t post_mortem_failure1 -D').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +NORMALIZE_WHITESPACE +REPORT_NDIFF +ELLIPSIS
            Running zope.testrunner.layer.UnitTests tests:
            ...
            Error in test test_post_mortem_failure1 (sample3.sampletests_d.TestSomething)
            Traceback (most recent call last):
              File ".../unittest.py",  line 252, in debug
                getattr(self, self.__testMethodName)()
              File "testrunner-ex/sample3/sampletests_d.py",
                line 42, in test_post_mortem_failure1
                assert x == y
            AssertionError
            <BLANKLINE>
            ...AssertionError
            <BLANKLINE>
            > testrunner-ex/sample3/sampletests_d.py(42)test_post_mortem_failure1()
            -> assert x == y
            (Pdb) p x
            1
            (Pdb) p y
            2
            (Pdb) c
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        Layers that can't be torn down
        ==============================
        
        A layer can have a tearDown method that raises NotImplementedError.
        If this is the case and there are no remaining tests to run, the test
        runner will just note that the tear down couldn't be done:
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> from zope import testrunner
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
            >>> sys.argv = 'test -ssample2 --tests-pattern sampletests_ntd$'.split()
            >>> testrunner.run_internal(defaults)
            Running sample2.sampletests_ntd.Layer tests:
              Set up sample2.sampletests_ntd.Layer in 0.000 seconds.
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            Tearing down left over layers:
              Tear down sample2.sampletests_ntd.Layer ... not supported
            False
        
        If the tearDown method raises NotImplementedError and there are remaining
        layers to run, the test runner will restart itself as a new process,
        resuming tests where it left off:
        
            >>> sys.argv = [testrunner_script, '--tests-pattern', 'sampletests_ntd$']
            >>> testrunner.run_internal(defaults)
            Running sample1.sampletests_ntd.Layer tests:
              Set up sample1.sampletests_ntd.Layer in N.NNN seconds.
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running sample2.sampletests_ntd.Layer tests:
              Tear down sample1.sampletests_ntd.Layer ... not supported
              Running in a subprocess.
              Set up sample2.sampletests_ntd.Layer in N.NNN seconds.
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
              Tear down sample2.sampletests_ntd.Layer ... not supported
            Running sample3.sampletests_ntd.Layer tests:
              Running in a subprocess.
              Set up sample3.sampletests_ntd.Layer in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Error in test test_error1 (sample3.sampletests_ntd.TestSomething)
            Traceback (most recent call last):
             testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_error1
                raise TypeError("Can we see errors")
            TypeError: Can we see errors
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Error in test test_error2 (sample3.sampletests_ntd.TestSomething)
            Traceback (most recent call last):
             testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_error2
                raise TypeError("I hope so")
            TypeError: I hope so
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Failure in test test_fail1 (sample3.sampletests_ntd.TestSomething)
            Traceback (most recent call last):
             testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_fail1
                self.assertEqual(1, 2)
            AssertionError: 1 != 2
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Failure in test test_fail2 (sample3.sampletests_ntd.TestSomething)
            Traceback (most recent call last):
             testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_fail2
                self.assertEqual(1, 3)
            AssertionError: 1 != 3
            <BLANKLINE>
              Ran 6 tests with 2 failures, 2 errors and 0 skipped in N.NNN seconds.
              Tear down sample3.sampletests_ntd.Layer ... not supported
            Total: 8 tests, 2 failures, 2 errors and 0 skipped in N.NNN seconds.
            True
        
        in the example above, some of the tests run as a subprocess had errors
        and failures. They were displayed as usual and the failure and error
        statistice were updated as usual.
        
        Note that debugging doesn't work when running tests in a subprocess:
        
            >>> sys.argv = [testrunner_script, '--tests-pattern', 'sampletests_ntd$',
            ...             '-D', ]
            >>> testrunner.run_internal(defaults)
            Running sample1.sampletests_ntd.Layer tests:
              Set up sample1.sampletests_ntd.Layer in N.NNN seconds.
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Running sample2.sampletests_ntd.Layer tests:
              Tear down sample1.sampletests_ntd.Layer ... not supported
              Running in a subprocess.
              Set up sample2.sampletests_ntd.Layer in N.NNN seconds.
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
              Tear down sample2.sampletests_ntd.Layer ... not supported
            Running sample3.sampletests_ntd.Layer tests:
              Running in a subprocess.
              Set up sample3.sampletests_ntd.Layer in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Error in test test_error1 (sample3.sampletests_ntd.TestSomething)
            Traceback (most recent call last):
             testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_error1
                raise TypeError("Can we see errors")
            TypeError: Can we see errors
            <BLANKLINE>
            <BLANKLINE>
            **********************************************************************
            Can't post-mortem debug when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Error in test test_error2 (sample3.sampletests_ntd.TestSomething)
            Traceback (most recent call last):
             testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_error2
                raise TypeError("I hope so")
            TypeError: I hope so
            <BLANKLINE>
            <BLANKLINE>
            **********************************************************************
            Can't post-mortem debug when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Error in test test_fail1 (sample3.sampletests_ntd.TestSomething)
            Traceback (most recent call last):
             testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_fail1
                self.assertEqual(1, 2)
            AssertionError: 1 != 2
            <BLANKLINE>
            <BLANKLINE>
            **********************************************************************
            Can't post-mortem debug when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Error in test test_fail2 (sample3.sampletests_ntd.TestSomething)
            Traceback (most recent call last):
             testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_fail2
                self.assertEqual(1, 3)
            AssertionError: 1 != 3
            <BLANKLINE>
            <BLANKLINE>
            **********************************************************************
            Can't post-mortem debug when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
              Ran 6 tests with 0 failures, 4 errors and 0 skipped in N.NNN seconds.
              Tear down sample3.sampletests_ntd.Layer ... not supported
            Total: 8 tests, 0 failures, 4 errors and 0 skipped in N.NNN seconds.
            True
        
        Similarly, pdb.set_trace doesn't work when running tests in a layer
        that is run as a subprocess:
        
            >>> sys.argv = [testrunner_script, '--tests-pattern', 'sampletests_ntds']
            >>> testrunner.run_internal(defaults)
            Running sample1.sampletests_ntds.Layer tests:
              Set up sample1.sampletests_ntds.Layer in 0.000 seconds.
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            Running sample2.sampletests_ntds.Layer tests:
              Tear down sample1.sampletests_ntds.Layer ... not supported
              Running in a subprocess.
              Set up sample2.sampletests_ntds.Layer in 0.000 seconds.
            --Return--
            > testrunner-ex/sample2/sampletests_ntds.py(37)test_something()->None
            -> import pdb; pdb.set_trace()
            (Pdb) c
            <BLANKLINE>
            **********************************************************************
            Can't use pdb.set_trace when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
            --Return--
            > testrunner-ex/sample2/sampletests_ntds.py(40)test_something2()->None
            -> import pdb; pdb.set_trace()
            (Pdb) c
            <BLANKLINE>
            **********************************************************************
            Can't use pdb.set_trace when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
            --Return--
            > testrunner-ex/sample2/sampletests_ntds.py(43)test_something3()->None
            -> import pdb; pdb.set_trace()
            (Pdb) c
            <BLANKLINE>
            **********************************************************************
            Can't use pdb.set_trace when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
            --Return--
            > testrunner-ex/sample2/sampletests_ntds.py(46)test_something4()->None
            -> import pdb; pdb.set_trace()
            (Pdb) c
            <BLANKLINE>
            **********************************************************************
            Can't use pdb.set_trace when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
            --Return--
            > testrunner-ex/sample2/sampletests_ntds.py(52)f()->None
            -> import pdb; pdb.set_trace()
            (Pdb) c
            <BLANKLINE>
            **********************************************************************
            Can't use pdb.set_trace when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
            --Return--
            > doctest.py(351)set_trace()->None
            -> Pdb().set_trace()
            (Pdb) c
            <BLANKLINE>
            **********************************************************************
            Can't use pdb.set_trace when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
            --Return--
            > doctest.py(351)set_trace()->None
            -> Pdb().set_trace()
            (Pdb) c
            <BLANKLINE>
            **********************************************************************
            Can't use pdb.set_trace when running a layer as a subprocess!
            **********************************************************************
            <BLANKLINE>
              Ran 7 tests with 0 failures, 0 errors and 0 skipped in 0.008 seconds.
              Tear down sample2.sampletests_ntds.Layer ... not supported
            Total: 8 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            False
        
        If you want to use pdb from a test in a layer that is run as a
        subprocess, then rerun the test runner selecting *just* that layer so
        that it's not run as a subprocess.
        
        
        If a test is run in a subprocess and it generates output on stderr (as
        stderrtest does), the output is ignored (but it doesn't cause a SubprocessError
        like it once did).
        
            >>> from six import StringIO
            >>> real_stderr = sys.stderr
            >>> sys.stderr = StringIO()
        
            >>> sys.argv = [testrunner_script, '-s', 'sample2', '--tests-pattern',
            ...     '(sampletests_ntd$|stderrtest)']
            >>> testrunner.run_internal(defaults)
            Running sample2.sampletests_ntd.Layer tests:
              Set up sample2.sampletests_ntd.Layer in 0.000 seconds.
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            Running sample2.stderrtest.Layer tests:
              Tear down sample2.sampletests_ntd.Layer ... not supported
              Running in a subprocess.
              Set up sample2.stderrtest.Layer in 0.000 seconds.
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.002 seconds.
              Tear down sample2.stderrtest.Layer in 0.000 seconds.
            Total: 2 tests, 0 failures, 0 errors and 0 skipped in 0.197 seconds.
            False
        
            >>> print((sys.stderr.getvalue()))
            A message on stderr.  Please ignore (expected in test output).
        
            >>> sys.stderr = real_stderr
        
        
        
        Egg Support
        ===========
        
        
        The `ftest` Setup Command
        -------------------------
        
        The `ftest` class is a proper `distutils` command and `zope.testrunner`
        exposes it as such via an entry point.
        
          >>> import pkg_resources
          >>> ws = pkg_resources.WorkingSet()
          >>> eps = dict([(ep.name, ep)
          ...             for ep in ws.iter_entry_points('distutils.commands')])
          >>> 'ftest' in eps
          True
          >>> eps['ftest']
          EntryPoint.parse('ftest = zope.testrunner.eggsupport:ftest')
        
        Let's now run this command:
        
          >>> import zope.testrunner
          >>> org_run = zope.testrunner.run
        
          >>> def run(args):
          ...     print(' '.join(args))
          >>> zope.testrunner.run = run
        
          >>> import os, tempfile, shutil
          >>> tmpdir = tempfile.mkdtemp()
          >>> srcdir = os.path.join(tmpdir, 'src')
          >>> os.mkdir(srcdir)
        
          >>> import setuptools.dist
          >>> dist = setuptools.dist.Distribution(
          ...     {'package_dir': {'': srcdir},
          ...      'script_name': __file__})
        
          >>> from zope.testrunner.eggsupport import ftest
          >>> ftest(dist).run()
          IGNORE_ME --test-path .../src
        
        Cleanup:
        
          >>> zope.testrunner.run = org_run
          >>> shutil.rmtree(tmpdir)
        
        
        Skipping Tests with Layers
        --------------------------
        
        The ``SkipLayers`` scanning test loader can replace the standard test loader,
        so that any tests that require layers are skipped. This is necessary, since
        the standard setuptools testing facility does not handle layers. It can be
        used as follows::
        
              setup(
              ...
              setup_requires=['eggtestinfo' # captures testing metadata in EGG-INFO
                             ],
              tests_require=['zope.testrunner',
                            ],
              ...
              test_loader='zope.testrunner.eggsupport:SkipLayers',
              ...
              )
        
        Let's now crete some test suites to make sure that all tests with layers are
        properly skipped.
        
          >>> import doctest
          >>> import unittest
        
          >>> all = unittest.TestSuite()
          >>> class T1(unittest.TestCase):
          ...     def test_t1(self):
          ...         pass
          >>> class T2(unittest.TestCase):
          ...     layer = 'layer'
          ...     def test_t2(self):
          ...         pass
          >>> T3 = doctest.DocTestSuite('zope.testrunner.find')
          >>> T4 = doctest.DocTestSuite('zope.testrunner.options')
          >>> T4.layer = 'layer'
          >>> T5 = doctest.DocFileSuite('testrunner.txt', package='zope.testrunner.tests')
          >>> T6 = doctest.DocFileSuite('testrunner-gc.txt', package='zope.testrunner.tests')
          >>> T6.layer = 'layer'
        
          >>> all = unittest.TestSuite((
          ...     unittest.makeSuite(T1), unittest.makeSuite(T2), T3, T4, T5, T6,
          ...     ))
        
        Let's return those tests from the scan:
        
          >>> from setuptools.command.test import ScanningLoader
          >>> orig_loadTestsFromModule = ScanningLoader.loadTestsFromModule
          >>> ScanningLoader.loadTestsFromModule = lambda *args: all
        
        Now we can retrieve the modules from the layer skipping loader:
        
          >>> from zope.testrunner.eggsupport import SkipLayers
          >>> filtered = SkipLayers().loadTestsFromModule('zope.testrunner')
        
          >>> len(filtered._tests)
          3
          >>> from pprint import pprint
          >>> pprint(filtered._tests)
          [<...T1 testMethod=test_t1>,
           StartUpFailure (zope.testrunner.find),
           .../zope/testrunner/tests/testrunner.txt]
        
        Cleanup:
        
          >>> ScanningLoader.loadTestsFromModule = orig_loadTestsFromModule
        
        When the distribution specified a ``test_suite``, another method is used to
        load the tests.
        
          >>> orig_loadTestsFromNames = ScanningLoader.loadTestsFromNames
          >>> ScanningLoader.loadTestsFromNames = lambda *args: all
        
        Now we can retrieve the modules from the layer skipping loader:
        
          >>> from zope.testrunner.eggsupport import SkipLayers
          >>> filtered = SkipLayers().loadTestsFromNames(
          ...     'zope.testrunner.tests.test_suite', 'zope.testrunner')
        
          >>> len(filtered._tests)
          3
          >>> from pprint import pprint
          >>> pprint(filtered._tests)
          [<...T1 testMethod=test_t1>,
           StartUpFailure (zope.testrunner.find),
           .../zope/testrunner/tests/testrunner.txt]
        
        Cleanup:
        
          >>> ScanningLoader.loadTestsFromNames = orig_loadTestsFromNames
        
        Code Coverage
        =============
        
        If the --coverage option is used, test coverage reports will be generated.  The
        directory name given as the parameter will be used to hold the reports.
        
        
            >>> import os.path, sys, tempfile
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
            >>> tempdir = tempfile.mkdtemp(prefix='zope.testrunner-')
            >>> coverage_dir = os.path.join(tempdir, 'coverage_dir')
        
            >>> sys.argv = ['test', '--coverage', coverage_dir]
        
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults)
            Running samplelayers.Layer1 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Ran 9 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            Running samplelayers.Layer11 tests:
              Set up samplelayers.Layer11 in 0.000 seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.125 seconds.
            Running samplelayers.Layer111 tests:
              Set up samplelayers.Layerx in 0.000 seconds.
              Set up samplelayers.Layer111 in 0.000 seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.125 seconds.
            Running samplelayers.Layer112 tests:
              Tear down samplelayers.Layer111 in 0.000 seconds.
              Set up samplelayers.Layer112 in 0.000 seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.125 seconds.
            Running samplelayers.Layer12 tests:
              Tear down samplelayers.Layer112 in 0.000 seconds.
              Tear down samplelayers.Layerx in 0.000 seconds.
              Tear down samplelayers.Layer11 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.140 seconds.
            Running samplelayers.Layer121 tests:
              Set up samplelayers.Layer121 in 0.000 seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.125 seconds.
            Running samplelayers.Layer122 tests:
              Tear down samplelayers.Layer121 in 0.000 seconds.
              Set up samplelayers.Layer122 in 0.000 seconds.
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.125 seconds.
            Running zope.testrunner.layer.UnitTests tests:
              Tear down samplelayers.Layer122 in 0.000 seconds.
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
              Set up zope.testrunner.layer.UnitTests in 0.000 seconds.
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in 0.687 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in 0.000 seconds.
            lines   cov%   module   (path)
            ...
               48   100%   sampletests.test1   (testrunner-ex/sampletests/test1.py)
               74   100%   sampletests.test11   (testrunner-ex/sampletests/test11.py)
               74   100%   sampletests.test111   (testrunner-ex/sampletests/test111.py)
               76   100%   sampletests.test112   (testrunner-ex/sampletests/test112.py)
               74   100%   sampletests.test12   (testrunner-ex/sampletests/test12.py)
               74   100%   sampletests.test121   (testrunner-ex/sampletests/test121.py)
               74   100%   sampletests.test122   (testrunner-ex/sampletests/test122.py)
               48   100%   sampletests.test_one   (testrunner-ex/sampletests/test_one.py)
              112    95%   sampletestsf   (testrunner-ex/sampletestsf.py)
            Total: 321 tests, 0 failures, 0 errors and 0 skipped in 0.630 seconds.
            False
        
        The directory specified with the --coverage option will have been created and
        will hold the coverage reports.
        
            >>> os.path.exists(coverage_dir)
            True
            >>> os.listdir(coverage_dir)
            [...]
        
        (We should clean up after ourselves.)
        
            >>> import shutil
            >>> shutil.rmtree(tempdir)
        
        
        Ignoring Tests
        --------------
        
        The ``trace`` module supports ignoring directories and modules based the test
        selection. Only directories selected for testing should report coverage. The
        test runner provides a custom implementation of the relevant API.
        
        The ``TestIgnore`` class, the class managing the ignoring, is initialized by
        passing the command line options. It uses the options to determine the
        directories that should be covered.
        
          >>> class FauxOptions(object):
          ...   package = None
          ...   test_path = [('/myproject/src/blah/foo', ''),
          ...                ('/myproject/src/blah/bar', '')]
          >>> from zope.testrunner import coverage
          >>> from zope.testrunner.find import test_dirs
          >>> ignore = coverage.TestIgnore(test_dirs(FauxOptions(), {}))
          >>> ignore._test_dirs
          ['/myproject/src/blah/foo/', '/myproject/src/blah/bar/']
        
        We can now ask whether a particular module should be ignored:
        
          >>> ignore.names('/myproject/src/blah/foo/baz.py', 'baz')
          False
          >>> ignore.names('/myproject/src/blah/bar/mine.py', 'mine')
          False
          >>> ignore.names('/myproject/src/blah/foo/__init__.py', 'foo')
          False
          >>> ignore.names('/myproject/src/blah/hello.py', 'hello')
          True
        
        When running the test runner, modules are sometimes created from text
        strings. Those should *always* be ignored:
        
          >>> ignore.names('/myproject/src/blah/hello.txt', '<string>')
          True
        
        To make this check fast, the class implements a cache. In an early
        implementation, the result was cached by the module name, which was a problem,
        since a lot of modules carry the same name (not the Python dotted name
        here!). So just because a module has the same name in an ignored and tested
        directory, does not mean it is always ignored:
        
          >>> ignore.names('/myproject/src/blah/module.py', 'module')
          True
          >>> ignore.names('/myproject/src/blah/foo/module.py', 'module')
          False
        
        Profiling
        =========
        The testrunner supports hotshot and cProfile profilers. Hotshot profiler
        support does not work with python2.6
        
            >>> import os.path, sys, tempfile
            >>> profiler = '--profile=hotshot'
            >>> if sys.hexversion >= 0x02060000:
            ...     profiler = '--profile=cProfile'
        
        The testrunner includes the ability to profile the test execution with hotshot
        via the --profile option, if it a python <= 2.6
        
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> sys.path.append(directory_with_tests)
        
            >>> tempdir = tempfile.mkdtemp(prefix='zope.testrunner-')
        
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     '--profile-directory', tempdir,
            ...     ]
        
            >>> sys.argv = [testrunner_script, profiler]
        
        When the tests are run, we get profiling output.
        
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults)
            Running samplelayers.Layer1 tests:
            ...
            Running samplelayers.Layer11 tests:
            ...
            Running zope.testrunner.layer.UnitTests tests:
            ...
               ncalls  tottime  percall  cumtime  percall filename:lineno(function)
            ...
            Total: ... tests, 0 failures, 0 errors and 0 skipped in ... seconds.
            False
        
        Profiling also works across layers.
        
            >>> sys.argv = [testrunner_script, '-ssample2', profiler,
            ...             '--tests-pattern', 'sampletests_ntd']
            >>> testrunner.run_internal(defaults)
            Running...
              Tear down ... not supported...
               ncalls  tottime  percall  cumtime  percall filename:lineno(function)...
        
        The testrunner creates temnporary files containing hotshot profiler
        data:
        
            >>> os.listdir(tempdir)
            ['tests_profile.cZj2jt.prof', 'tests_profile.yHD-so.prof']
        
        It deletes these when rerun.  We'll delete these ourselves:
        
            >>> import shutil
            >>> shutil.rmtree(tempdir)
        
        Running Without Source Code
        ===========================
        
        The ``--usecompiled`` option allows running tests in a tree without .py
        source code, provided compiled .pyc or .pyo files exist (without
        ``--usecompiled``, .py files are necessary).
        
        We have a very simple directory tree, under ``usecompiled/``, to test
        this.  Because we're going to delete its .py files, we want to work
        in a copy of that:
        
            >>> import os.path, shutil, sys, tempfile
            >>> directory_with_tests = tempfile.mkdtemp()
        
            >>> NEWNAME = "unlikely_package_name"
            >>> src = os.path.join(this_directory, 'testrunner-ex', 'usecompiled')
            >>> os.path.isdir(src)
            True
            >>> dst = os.path.join(directory_with_tests, NEWNAME)
            >>> os.path.isdir(dst)
            False
        
        Have to use our own copying code, to avoid copying read-only SVN files that
        can't be deleted later.
        
            >>> n = len(src) + 1
            >>> for root, dirs, files in os.walk(src):
            ...     dirs[:] = [d for d in dirs if d == "package"] # prune cruft
            ...     os.mkdir(os.path.join(dst, root[n:]))
            ...     for f in files:
            ...         _ = shutil.copy(os.path.join(root, f),
            ...                         os.path.join(dst, root[n:], f))
        
        Now run the tests in the copy:
        
            >>> from zope import testrunner
        
            >>> mydefaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^compiletest$',
            ...     '--package', NEWNAME,
            ...     '-vv',
            ...     ]
            >>> sys.argv = ['test']
            >>> testrunner.run_internal(mydefaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test1 (unlikely_package_name.compiletest.Test)
             test2 (unlikely_package_name.compiletest.Test)
             test1 (unlikely_package_name.package.compiletest.Test)
             test2 (unlikely_package_name.package.compiletest.Test)
              Ran 4 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        If we delete the source files, it's normally a disaster:  the test runner
        doesn't believe any test files, or even packages, exist.  Note that we pass
        ``--keepbytecode`` this time, because otherwise the test runner would
        delete the compiled Python files too:
        
            >>> for root, dirs, files in os.walk(dst):
            ...    for f in files:
            ...        if f.endswith(".py"):
            ...            os.remove(os.path.join(root, f))
            >>> testrunner.run_internal(mydefaults, ["test", "--keepbytecode"])
            Running tests at level 1
            Total: 0 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            False
        
        Finally, passing ``--usecompiled`` asks the test runner to treat .pyc
        and .pyo files as adequate replacements for .py files.  Note that the
        output is the same as when running with .py source above.  The absence
        of "removing stale bytecode ..." messages shows that ``--usecompiled``
        also implies ``--keepbytecode``:
        
            >>> if sys.version_info >= (3, 2):
            ...     # PEP-3147: pyc files in __pycache__ directories cannot be
            ...     # imported; legacy source-less imports need to use the legacy
            ...     # layout
            ...     for root, dirs, files in os.walk(dst):
            ...         for f in files:
            ...             if f.endswith((".pyc", ".pyo")):
            ...                 # "root/f" is "dirname/__pycache__/name.magic.ext"
            ...                 dirname = os.path.dirname(os.path.abspath(root))
            ...                 namewmagic, ext = os.path.splitext(os.path.basename(f))
            ...                 newname = os.path.splitext(namewmagic)[0] + ext
            ...                 os.rename(os.path.join(root, f),
            ...                           os.path.join(dirname, newname))
        
            >>> testrunner.run_internal(mydefaults, ["test", "--usecompiled"])
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test1 (unlikely_package_name.compiletest.Test)
             test2 (unlikely_package_name.compiletest.Test)
             test1 (unlikely_package_name.package.compiletest.Test)
             test2 (unlikely_package_name.package.compiletest.Test)
              Ran 4 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        Remove the temporary directory:
        
            >>> shutil.rmtree(directory_with_tests)
        
        Repeating Tests
        ===============
        
        The --repeat option can be used to repeat tests some number of times.
        Repeating tests is useful to help make sure that tests clean up after
        themselves.
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
            >>> sys.argv = 'test --layer 112 --layer UnitTests --repeat 3'.split()
            >>> from zope import testrunner
            >>> testrunner.run_internal(defaults)
            Running samplelayers.Layer112 tests:
              Set up samplelayers.Layerx in 0.000 seconds.
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer11 in 0.000 seconds.
              Set up samplelayers.Layer112 in 0.000 seconds.
            Iteration 1
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.010 seconds.
            Iteration 2
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.010 seconds.
            Iteration 3
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.010 seconds.
            Running zope.testrunner.layer.UnitTests tests:
              Tear down samplelayers.Layer112 in N.NNN seconds.
              Tear down samplelayers.Layerx in N.NNN seconds.
              Tear down samplelayers.Layer11 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            Iteration 1
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Iteration 2
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Iteration 3
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            Total: 182 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            False
        
        The tests are repeated by layer.  Layers are set up and torn down only
        once.
        
        Garbage Collection Control
        ==========================
        
        When having problems that seem to be caused my memory-management
        errors, it can be helpful to adjust Python's cyclic garbage collector
        or to get garbage colection statistics.  The --gc option can be used
        for this purpose.
        
        If you think you are getting a test failure due to a garbage
        collection problem, you can try disabling garbage collection by
        using the --gc option with a value of zero.
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = ['--path', directory_with_tests]
        
            >>> from zope import testrunner
        
            >>> sys.argv = 'test --tests-pattern ^gc0$ --gc 0 -vv'.split()
            >>> _ = testrunner.run_internal(defaults)
            Cyclic garbage collection is disabled.
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             make_sure_gc_is_disabled (gc0)
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
        
        Alternatively, if you think you are having a garbage collection
        related problem, you can cause garbage collection to happen more often
        by providing a low threshold:
            
            >>> sys.argv = 'test --tests-pattern ^gc1$ --gc 1 -vv'.split()
            >>> _ = testrunner.run_internal(defaults)
            Cyclic garbage collection threshold set to: (1,)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             make_sure_gc_threshold_is_one (gc1)
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
        You can specify up to 3 --gc options to set each of the 3 gc threshold
        values:
        
            
            >>> sys.argv = ('test --tests-pattern ^gcset$ --gc 701 --gc 11 --gc 9 -vv'
            ...             .split())
            >>> _ = testrunner.run_internal(defaults)
            Cyclic garbage collection threshold set to: (701, 11, 9)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             make_sure_gc_threshold_is_701_11_9 (gcset)
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
        Specifying more than 3 --gc options is not allowed:
        
        
            >>> from six import StringIO
            >>> out = StringIO()
            >>> stdout = sys.stdout
            >>> sys.stdout = out
        
            >>> sys.argv = ('test --tests-pattern ^gcset$ --gc 701 --gc 42 --gc 11 --gc 9 -vv'
            ...             .split())
            >>> _ = testrunner.run_internal(defaults)
            Traceback (most recent call last):
            ...
            SystemExit: 1
        
            >>> sys.stdout = stdout
        
            >>> print(out.getvalue())
            Too many --gc options
        
        Garbage Collection Statistics
        -----------------------------
        
        You can enable gc debugging statistics using the --gc-options (-G)
        option.  You should provide names of one or more of the flags
        described in the library documentation for the gc module.
        
        The output statistics are written to standard error.
        
            >>> from six import StringIO
            >>> err = StringIO()
            >>> stderr = sys.stderr
            >>> sys.stderr = err
            >>> sys.argv = ('test --tests-pattern ^gcstats$ -G DEBUG_STATS'
            ...             ' -G DEBUG_COLLECTABLE -vv'
            ...             .split())
            >>> _ = testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             generate_some_gc_statistics (gcstats)
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
            >>> sys.stderr = stderr
        
            >>> print(err.getvalue())        # doctest: +ELLIPSIS
            gc: collecting generation ...
        
        
        Debugging Memory Leaks
        ======================
        
        The --report-refcounts (-r) option can be used with the --repeat (-N)
        option to detect and diagnose memory leaks.  To use this option, you
        must configure Python with the --with-pydebug option. (On Unix, pass
        this option to configure and then build Python.)
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
            >>> from zope import testrunner
            
            >>> sys.argv = 'test --layer Layer11$ --layer Layer12$ -N4 -r'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running samplelayers.Layer11 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer11 in 0.000 seconds.
            Iteration 1
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.013 seconds.
            Iteration 2
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.012 seconds.
              sys refcount=100401   change=0     
            Iteration 3
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.012 seconds.
              sys refcount=100401   change=0     
            Iteration 4
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.013 seconds.
              sys refcount=100401   change=0     
            Running samplelayers.Layer12 tests:
              Tear down samplelayers.Layer11 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
            Iteration 1
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.013 seconds.
            Iteration 2
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.012 seconds.
              sys refcount=100411   change=0     
            Iteration 3
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.012 seconds.
              sys refcount=100411   change=0     
            Iteration 4
              Ran 26 tests with 0 failures, 0 errors and 0 skipped in 0.012 seconds.
              sys refcount=100411   change=0     
            Tearing down left over layers:
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
            Total: 68 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
        
        Each layer is repeated the requested number of times.  For each
        iteration after the first, the system refcount and change in system
        refcount is shown. The system refcount is the total of all refcount in
        the system.  When a refcount on any object is changed, the system
        refcount is changed by the same amount.  Tests that don't leak show
        zero changes in systen refcount.
        
        Let's look at an example test that leaks:
        
            >>> sys.argv = 'test --tests-pattern leak -N4 -r'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:...
            Iteration 1
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            Iteration 2
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
              sys refcount=92506    change=12
            Iteration 3
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
              sys refcount=92513    change=12
            Iteration 4
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
              sys refcount=92520    change=12
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
        Here we see that the system refcount is increating.  If we specify a
        verbosity greater than one, we can get details broken out by object
        type (or class):
        
            >>> sys.argv = 'test --tests-pattern leak -N5 -r -v'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:...
            Iteration 1
              Running:
                .
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            Iteration 2
              Running:
                .
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
              sum detail refcount=95832    sys refcount=105668   change=16    
                Leak details, changes in instances and refcounts by type/class:
                type/class                                               insts   refs
                -------------------------------------------------------  -----   ----
                classobj                                                     0      1
                dict                                                         2      2
                float                                                        1      1
                int                                                          2      2
                leak.ClassicLeakable                                         1      1
                leak.Leakable                                                1      1
                str                                                          0      4
                tuple                                                        1      1
                type                                                         0      3
                -------------------------------------------------------  -----   ----
                total                                                        8     16
            Iteration 3
              Running:
                .
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
              sum detail refcount=95844    sys refcount=105680   change=12    
                Leak details, changes in instances and refcounts by type/class:
                type/class                                               insts   refs
                -------------------------------------------------------  -----   ----
                classobj                                                     0      1
                dict                                                         2      2
                float                                                        1      1
                int                                                         -1      0
                leak.ClassicLeakable                                         1      1
                leak.Leakable                                                1      1
                str                                                          0      4
                tuple                                                        1      1
                type                                                         0      1
                -------------------------------------------------------  -----   ----
                total                                                        5     12
            Iteration 4
              Running:
                .
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
              sum detail refcount=95856    sys refcount=105692   change=12    
                Leak details, changes in instances and refcounts by type/class:
                type/class                                               insts   refs
                -------------------------------------------------------  -----   ----
                classobj                                                     0      1
                dict                                                         2      2
                float                                                        1      1
                leak.ClassicLeakable                                         1      1
                leak.Leakable                                                1      1
                str                                                          0      4
                tuple                                                        1      1
                type                                                         0      1
                -------------------------------------------------------  -----   ----
                total                                                        6     12
            Iteration 5
              Running:
                .
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
              sum detail refcount=95868    sys refcount=105704   change=12    
                Leak details, changes in instances and refcounts by type/class:
                type/class                                               insts   refs
                -------------------------------------------------------  -----   ----
                classobj                                                     0      1
                dict                                                         2      2
                float                                                        1      1
                leak.ClassicLeakable                                         1      1
                leak.Leakable                                                1      1
                str                                                          0      4
                tuple                                                        1      1
                type                                                         0      1
                -------------------------------------------------------  -----   ----
                total                                                        6     12
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
        It is instructive to analyze the results in some detail.  The test
        being run was designed to intentionally leak:
        
            class ClassicLeakable:
                def __init__(self):
                    self.x = 'x'
        
            class Leakable(object):
                def __init__(self):
                    self.x = 'x'
        
            leaked = []
        
            class TestSomething(unittest.TestCase):
        
                def testleak(self):
                    leaked.append((ClassicLeakable(), Leakable(), time.time()))
        
        Let's go through this by type.
        
        float, leak.ClassicLeakable, leak.Leakable, and tuple
            We leak one of these every time.  This is to be expected because
            we are adding one of these to the list every time.
        
        str
            We don't leak any instances, but we leak 4 references. These are
            due to the instance attributes avd values.
        
        dict
            We leak 2 of these, one for each ClassicLeakable and Leakable
            instance. 
        
        classobj
            We increase the number of classobj instance references by one each
            time because each ClassicLeakable instance has a reference to its
            class.  This instances increases the references in it's class,
            which increases the total number of references to classic classes
            (clasobj instances).
        
        type
            For most interations, we increase the number of type references by
            one for the same reason we increase the number of clasobj
            references by one.  The increase of the number of type references
            by 3 in the second iteration is puzzling, but illustrates that
            this sort of data is often puzzling.
        
        int
            The change in the number of int instances and references in this
            example is a side effect of the statistics being gathered.  Lots
            of integers are created to keep the memory statistics used here.
        
        The summary statistics include the sum of the detail refcounts.  (Note
        that this sum is less than the system refcount.  This is because the
        detailed analysis doesn't inspect every object. Not all objects in the
        system are returned by sys.getobjects.)
        
        Knitting in extra package directories
        =====================================
        
        Python packages have __path__ variables that can be manipulated to add
        extra directories cntaining software used in the packages.  The
        testrunner needs to be given extra information about this sort of
        situation.
        
        Let's look at an example.  The testrunner-ex-knit-lib directory
        is a directory that we want to add to the Python path, but that we
        don't want to search for tests.  It has a sample4 package and a
        products subpackage.  The products subpackage adds the
        testrunner-ex-knit-products to it's __path__.  We want to run tests
        from the testrunner-ex-knit-products directory.  When we import these
        tests, we need to import them from the sample4.products package.  We
        can't use the --path option to name testrunner-ex-knit-products.
        It isn't enough to add the containing directory to the test path
        because then we wouldn't be able to determine the package name
        properly.  We might be able to use the --package option to run the
        tests from the sample4/products package, but we want to run tests in
        testrunner-ex that aren't in this package.  
        
        We can use the --package-path option in this case.  The --package-path
        option is like the --test-path option in that it defines a path to be
        searched for tests without affecting the python path.  It differs in
        that it supplied a package name that is added a profex when importing
        any modules found.  The --package-path option takes *two* arguments, a
        package name and file path.
        
            >>> import os.path, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> sys.path.append(os.path.join(this_directory, 'testrunner-ex-pp-lib'))
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     '--package-path',
            ...     os.path.join(this_directory, 'testrunner-ex-pp-products'),
            ...     'sample4.products',
            ...     ]
        
            >>> from zope import testrunner
            
            >>> sys.argv = 'test --layer Layer111 -vv'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer111 tests:
              Set up samplelayers.Layerx in 0.000 seconds.
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer11 in 0.000 seconds.
              Set up samplelayers.Layer111 in 0.000 seconds.
              Running:
                test_x1 (sample1.sampletests.test111.TestA)
                test_y0 (sample1.sampletests.test111.TestA)
                ...
                test_y0 (sampletests.test111)
                test_z1 (sampletests.test111)
                testrunner-ex/sampletests/../sampletestsl.txt
                test_extra_test_in_products (sample4.products.sampletests.Test)
                test_another_test_in_products (sample4.products.more.sampletests.Test)
              Ran 28 tests with 0 failures, 0 errors and 0 skipped in 0.008 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer111 in 0.000 seconds.
              Tear down samplelayers.Layerx in 0.000 seconds.
              Tear down samplelayers.Layer11 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
        
        In the example, the last test, test_extra_test_in_products, came from
        the products directory.  As usual, we can select the knit-in packages
        or individual packages within knit-in packages:
        
            >>> sys.argv = 'test --package sample4.products -vv'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer111 tests:
              Set up samplelayers.Layerx in 0.000 seconds.
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer11 in 0.000 seconds.
              Set up samplelayers.Layer111 in 0.000 seconds.
              Running:
                test_extra_test_in_products (sample4.products.sampletests.Test)
                test_another_test_in_products (sample4.products.more.sampletests.Test)
              Ran 2 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer111 in 0.000 seconds.
              Tear down samplelayers.Layerx in 0.000 seconds.
              Tear down samplelayers.Layer11 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
        
            >>> sys.argv = 'test --package sample4.products.more -vv'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer111 tests:
              Set up samplelayers.Layerx in 0.000 seconds.
              Set up samplelayers.Layer1 in 0.000 seconds.
              Set up samplelayers.Layer11 in 0.000 seconds.
              Set up samplelayers.Layer111 in 0.000 seconds.
              Running:
                test_another_test_in_products (sample4.products.more.sampletests.Test)
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer111 in 0.000 seconds.
              Tear down samplelayers.Layerx in 0.000 seconds.
              Tear down samplelayers.Layer11 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
        
        
        testrunner Edge Cases
        =====================
        
        This document has some edge-case examples to test various aspects of
        the test runner.
        
        Separating Python path and test directories
        -------------------------------------------
        
        The --path option defines a directory to be searched for tests *and* a
        directory to be added to Python's search path.  The --test-path option
        can be used when you want to set a test search path without also
        affecting the Python path:
        
            >>> import os, sys
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        
            >>> from zope import testrunner
        
            >>> defaults = [
            ...     '--test-path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
            >>> sys.argv = ['test']
            >>> testrunner.run_internal(defaults)
            ... # doctest: +ELLIPSIS
            Test-module import failures:
            <BLANKLINE>
            Module: sampletestsf
            <BLANKLINE>
            Traceback (most recent call last):
            ImportError: No module named sampletestsf
            ...
        
            >>> sys.path.append(directory_with_tests)
            >>> sys.argv = ['test']
            >>> testrunner.run_internal(defaults)
            ... # doctest: +ELLIPSIS
            Running samplelayers.Layer1 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Ran 9 tests with 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            ...
            Running zope.testrunner.layer.UnitTests tests:
              Tear down samplelayers.Layer122 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 156 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            Total: 321 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            False
        
        Bug #251759: The test runner's protection against descending into non-package
        directories was ineffective, e.g. picking up tests from eggs that were stored
        close by:
        
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex-251759')
        
            >>> defaults = [
            ...     '--test-path', directory_with_tests,
            ...     ]
            >>> testrunner.run_internal(defaults)
            Total: 0 tests, 0 failures, 0 errors and 0 skipped in 0.000 seconds.
            False
        
        
        Debugging Edge Cases
        --------------------
        
            >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
            >>> defaults = [
            ...     '--test-path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
            >>> class Input:
            ...     def __init__(self, src):
            ...         self.lines = src.split('\n')
            ...     def readline(self):
            ...         line = self.lines.pop(0)
            ...         print(line)
            ...         return line+'\n'
        
            >>> real_stdin = sys.stdin
        
        Using pdb.set_trace in a function called by an ordinary test:
        
            >>> sys.stdin = Input('p x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t set_trace2').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +ELLIPSIS
            Running zope.testrunner.layer.UnitTests tests:...
            > testrunner-ex/sample3/sampletests_d.py(47)f()
            -> y = x
            (Pdb) p x
            1
            (Pdb) c
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in 0.001 seconds.
            ...
            False
        
        Using pdb.set_trace in a function called by a doctest in a doc string:
        
            >>> sys.stdin = Input('n\np x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t set_trace4').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            > testrunner-ex/sample3/sampletests_d.py(NNN)f()
            -> y = x
            (Pdb) n
            --Return--
            > ...->None
            -> y = x
            (Pdb) p x
            1
            (Pdb) c
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Using pdb in a docstring-based doctest
        
            >>> sys.stdin = Input('n\np x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t set_trace3').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            > <doctest sample3.sampletests_d.set_trace3[1]>(3)?()
            -> y = x
            (Pdb) n
            --Return--
            > ...->None
            -> y = x
            (Pdb) p x
            1
            (Pdb) c
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Using pdb.set_trace in a doc file:
        
        
            >>> sys.stdin = Input('n\np x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t set_trace5').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            > <doctest set_trace5.txt[1]>(3)?()
            -> y = x
            (Pdb) n
            --Return--
            > ...->None
            -> y = x
            (Pdb) p x
            1
            (Pdb) c
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Using pdb.set_trace in a function called by a doctest in a doc file:
        
        
            >>> sys.stdin = Input('n\np x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t set_trace6').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            > testrunner-ex/sample3/sampletests_d.py(NNN)f()
            -> y = x
            (Pdb) n
            --Return--
            > ...->None
            -> y = x
            (Pdb) p x
            1
            (Pdb) c
              Ran 1 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Post-mortem debugging function called from ordinary test:
        
            >>> sys.stdin = Input('p x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t post_mortem2 -D').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +NORMALIZE_WHITESPACE
            Running zope.testrunner.layer.UnitTests tests:...
            <BLANKLINE>
            <BLANKLINE>
            Error in test test_post_mortem2 (sample3.sampletests_d.TestSomething)
            Traceback (most recent call last):
              File "testrunner-ex/sample3/sampletests_d.py",
                   line 37, in test_post_mortem2
                g()
              File "testrunner-ex/sample3/sampletests_d.py", line 46, in g
                raise ValueError
            ValueError
            <BLANKLINE>
            ...ValueError
            <BLANKLINE>
            > testrunner-ex/sample3/sampletests_d.py(46)g()
            -> raise ValueError
            (Pdb) p x
            1
            (Pdb) c
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        Post-mortem debugging docstring-based doctest:
        
            >>> sys.stdin = Input('p x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t post_mortem3 -D').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +NORMALIZE_WHITESPACE
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Error in test post_mortem3 (sample3.sampletests_d)
            Traceback (most recent call last):
            ...UnexpectedException: testrunner-ex/sample3/sampletests_d.py:NNN (2 examples)>
            <BLANKLINE>
            ...ValueError
            <BLANKLINE>
            > <doctest sample3.sampletests_d.post_mortem3[1]>(1)?()
            (Pdb) p x
            1
            (Pdb) c
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Post-mortem debugging function called from docstring-based doctest:
        
            >>> sys.stdin = Input('p x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t post_mortem4 -D').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +NORMALIZE_WHITESPACE
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Error in test post_mortem4 (sample3.sampletests_d)
            Traceback (most recent call last):
            ...UnexpectedException: testrunner-ex/sample3/sampletests_d.py:NNN (1 example)>
            <BLANKLINE>
            ...ValueError
            <BLANKLINE>
            > testrunner-ex/sample3/sampletests_d.py(NNN)g()
            -> raise ValueError
            (Pdb) p x
            1
            (Pdb) c
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Post-mortem debugging file-based doctest:
        
            >>> sys.stdin = Input('p x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t post_mortem5 -D').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +NORMALIZE_WHITESPACE
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Error testrunner-ex/sample3/post_mortem5.txt
            Traceback (most recent call last):
            ...UnexpectedException: testrunner-ex/sample3/post_mortem5.txt:0 (2 examples)>
            <BLANKLINE>
            ...ValueError
            <BLANKLINE>
            > <doctest post_mortem5.txt[1]>(1)?()
            (Pdb) p x
            1
            (Pdb) c
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        
        Post-mortem debugging function called from file-based doctest:
        
            >>> sys.stdin = Input('p x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t post_mortem6 -D').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +NORMALIZE_WHITESPACE
            Running zope.testrunner.layer.UnitTests tests:...
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Error testrunner-ex/sample3/post_mortem6.txt
            Traceback (most recent call last):
              File ".../zope/testing/doctest/__init__.py", Line NNN, in debug
                runner.run(self._dt_test, clear_globs=False)
              File ".../zope/testing/doctest/__init__.py", Line NNN, in run
                r = DocTestRunner.run(self, test, compileflags, out, False)
              File ".../zope/testing/doctest/__init__.py", Line NNN, in run
                return self.__run(test, compileflags, out)
              File ".../zope/testing/doctest/__init__.py", Line NNN, in __run
                exc_info)
              File ".../zope/testing/doctest/__init__.py", Line NNN, in report_unexpected_exception
                raise UnexpectedException(test, example, exc_info)
            ...UnexpectedException: testrunner-ex/sample3/post_mortem6.txt:0 (2 examples)>
            <BLANKLINE>
            ...ValueError
            <BLANKLINE>
            > testrunner-ex/sample3/sampletests_d.py(NNN)g()
            -> raise ValueError
            (Pdb) p x
            1
            (Pdb) c
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Post-mortem debugging of a docstring doctest failure:
        
            >>> sys.stdin = Input('p x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t post_mortem_failure2 -D').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +NORMALIZE_WHITESPACE
            Running zope.testrunner.layer.UnitTests tests:...
            <BLANKLINE>
            <BLANKLINE>
            Error in test post_mortem_failure2 (sample3.sampletests_d)
            <BLANKLINE>
            File "testrunner-ex/sample3/sampletests_d.py",
                           line 81, in sample3.sampletests_d.post_mortem_failure2
            <BLANKLINE>
            x
            <BLANKLINE>
            Want:
            2
            <BLANKLINE>
            Got:
            1
            <BLANKLINE>
            <BLANKLINE>
            > testrunner-ex/sample3/sampletests_d.py(81)_()
            ...ValueError: Expected and actual output are different
            > <string>(1)...()
            (Pdb) p x
            1
            (Pdb) c
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        
        Post-mortem debugging of a docfile doctest failure:
        
            >>> sys.stdin = Input('p x\nc')
            >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
            ...             ' -t post_mortem_failure.txt -D').split()
            >>> try: testrunner.run_internal(defaults)
            ... finally: sys.stdin = real_stdin
            ... # doctest: +NORMALIZE_WHITESPACE
            Running zope.testrunner.layer.UnitTests tests:...
            <BLANKLINE>
            <BLANKLINE>
            Error in test /home/jim/z3/zope.testrunner/src/zope/testing/testrunner-ex/sample3/post_mortem_failure.txt
            <BLANKLINE>
            File "testrunner-ex/sample3/post_mortem_failure.txt",
                                              line 2, in post_mortem_failure.txt
            <BLANKLINE>
            x
            <BLANKLINE>
            Want:
            2
            <BLANKLINE>
            Got:
            1
            <BLANKLINE>
            <BLANKLINE>
            > testrunner-ex/sample3/post_mortem_failure.txt(2)_()
            ...ValueError:
            Expected and actual output are different
            > <string>(1)...()
            (Pdb) p x
            1
            (Pdb) c
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Post-mortem debugging with triple verbosity
        
            >>> sys.argv = 'test --layer samplelayers.Layer1$ -vvv -D'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running samplelayers.Layer1 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Running:
                test_x1 (sampletestsf.TestA1) (0.000 s)
                test_y0 (sampletestsf.TestA1) (0.000 s)
                test_z0 (sampletestsf.TestA1) (0.000 s)
                test_x0 (sampletestsf.TestB1) (0.000 s)
                test_y1 (sampletestsf.TestB1) (0.000 s)
                test_z0 (sampletestsf.TestB1) (0.000 s)
                test_1 (sampletestsf.TestNotMuch1) (0.000 s)
                test_2 (sampletestsf.TestNotMuch1) (0.000 s)
                test_3 (sampletestsf.TestNotMuch1) (0.000 s)
              Ran 9 tests with 0 failures, 0 errors and 0 skipped in 0.001 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer1 in 0.000 seconds.
            False
        
        Test Suites with None for suites or tests
        -----------------------------------------
        
            >>> sys.argv = ['test',
            ...             '--tests-pattern', '^sampletests_none_suite$',
            ...     ]
            >>> testrunner.run_internal(defaults)
            Test-module import failures:
            <BLANKLINE>
            Module: sample1.sampletests_none_suite
            <BLANKLINE>
            Traceback (most recent call last):
            TypeError: Invalid test_suite, None, in sample1.sampletests_none_suite
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Test-modules with import problems:
              sample1.sampletests_none_suite
            Total: 0 tests, 0 failures, 1 errors and 0 skipped in N.NNN seconds.
            True
        
        
            >>> sys.argv = ['test',
            ...             '--tests-pattern', '^sampletests_none_test$',
            ...     ]
            >>> testrunner.run_internal(defaults)
            Test-module import failures:
            <BLANKLINE>
            Module: sample1.sampletests_none_test
            <BLANKLINE>
            Traceback (most recent call last):
            TypeError: ...
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Test-modules with import problems:
              sample1.sampletests_none_test
            Total: 0 tests, 0 failures, 1 errors and 0 skipped in N.NNN seconds.
            True
        
        You must use --repeat with --report-refcounts
        ---------------------------------------------
        
        It is an error to specify --report-refcounts (-r) without specifying a
        repeat count greater than 1
        
            >>> sys.argv = 'test -r'.split()
            >>> testrunner.run_internal(defaults)
                    You must use the --repeat (-N) option to specify a repeat
                    count greater than 1 when using the --report_refcounts (-r)
                    option.
            <BLANKLINE>
            True
        
            >>> sys.argv = 'test -r -N1'.split()
            >>> testrunner.run_internal(defaults)
                    You must use the --repeat (-N) option to specify a repeat
                    count greater than 1 when using the --report_refcounts (-r)
                    option.
            <BLANKLINE>
            True
        
        
        Selection
        ---------
        
        Several tests can be excluded using the '!' notation:
        
            >>> sys.argv = 'test -u -vv -ssample1.sample13 -t!test_x -t!test_y'.split()
            >>> testrunner.run_internal(defaults)
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
             test_z0 (sample1.sample13.sampletests.TestA)
             test_z0 (sample1.sample13.sampletests.TestB)
             test_1 (sample1.sample13.sampletests.TestNotMuch)
             test_2 (sample1.sample13.sampletests.TestNotMuch)
             test_3 (sample1.sample13.sampletests.TestNotMuch)
             test_z1 (sample1.sample13.sampletests)
             testrunner-ex/sample1/sample13/../../sampletests.txt
              Ran 7 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            False
        
        Errors and Failures
        ===================
        
        Let's look at tests that have errors and failures, first we need to make a
        temporary copy of the entire testing directory (except .svn files which may
        be read only):
        
            >>> import os.path, sys, tempfile, shutil
            >>> tmpdir = tempfile.mkdtemp()
            >>> directory_with_tests = os.path.join(tmpdir, 'testrunner-ex')
            >>> source = os.path.join(this_directory, 'testrunner-ex')
            >>> n = len(source) + 1
            >>> for root, dirs, files in os.walk(source):
            ...     dirs[:] = [d for d in dirs if d != ".svn"] # prune cruft
            ...     os.mkdir(os.path.join(directory_with_tests, root[n:]))
            ...     for f in files:
            ...         _ = shutil.copy(os.path.join(root, f),
            ...                         os.path.join(directory_with_tests, root[n:], f))
        
            >>> from zope import testrunner
            >>> defaults = [
            ...     '--path', directory_with_tests,
            ...     '--tests-pattern', '^sampletestsf?$',
            ...     ]
        
            >>> sys.argv = 'test --tests-pattern ^sampletests(f|_e|_f)?$ '.split()
            >>> testrunner.run_internal(defaults)
            ... # doctest: +NORMALIZE_WHITESPACE +ELLIPSIS
            Running samplelayers.Layer1 tests:
            ...
            Running zope.testrunner.layer.UnitTests tests:
            ...
            <BLANKLINE>
            <BLANKLINE>
            Failure in test eek (sample2.sampletests_e)
            Failed doctest test for sample2.sampletests_e.eek
              File "testrunner-ex/sample2/sampletests_e.py", line 28, in eek
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_e.py", line 30, in sample2.sampletests_e.eek
            Failed example:
                f()
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_e.eek[0]>", line 1, in ?
                    f()
                  File "testrunner-ex/sample2/sampletests_e.py", line 19, in f
                    g()
                  File "testrunner-ex/sample2/sampletests_e.py", line 24, in g
                    x = y + 1
                   - __traceback_info__: I don't know what Y should be.
                NameError: global name 'y' is not defined
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Error in test test3 (sample2.sampletests_e.Test)
            Traceback (most recent call last):
              File "testrunner-ex/sample2/sampletests_e.py", line 43, in test3
                f()
              File "testrunner-ex/sample2/sampletests_e.py", line 19, in f
                g()
              File "testrunner-ex/sample2/sampletests_e.py", line 24, in g
                x = y + 1
               - __traceback_info__: I don't know what Y should be.
            NameError: global name 'y' is not defined
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Failure in test testrunner-ex/sample2/e.txt
            Failed doctest test for e.txt
              File "testrunner-ex/sample2/e.txt", line 0
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/e.txt", line 4, in e.txt
            Failed example:
                f()
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest e.txt[1]>", line 1, in ?
                    f()
                  File "<doctest e.txt[0]>", line 2, in f
                    return x
                NameError: global name 'x' is not defined
            <BLANKLINE>
            <BLANKLINE>
            <BLANKLINE>
            Failure in test test (sample2.sampletests_f.Test)
            Traceback (most recent call last):
              File "testrunner-ex/sample2/sampletests_f.py", line 21, in test
                self.assertEqual(1,0)
              File "/usr/local/python/2.3/lib/python2.3/unittest.py", line 302, in failUnlessEqual
                raise self.failureException, \
            AssertionError: 1 != 0
            <BLANKLINE>
              Ran 164 tests with 3 failures, 1 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            Total: 329 tests, 3 failures, 1 errors and 0 skipped in N.NNN seconds.
            True
        
        We see that we get an error report and a traceback for the failing
        test.  In addition, the test runner returned True, indicating that
        there was an error.
        
        If we ask for verbosity, the dotted output will be interrupted, and
        there'll be a summary of the errors at the end of the test:
        
            >>> sys.argv = 'test --tests-pattern ^sampletests(f|_e|_f)?$ -uv'.split()
            >>> testrunner.run_internal(defaults)
            ... # doctest: +NORMALIZE_WHITESPACE +REPORT_NDIFF
            Running tests at level 1
            Running zope.testrunner.layer.UnitTests tests:
            ...
              Running:
            .................................................................................................
            <BLANKLINE>
            Failure in test eek (sample2.sampletests_e)
            Failed doctest test for sample2.sampletests_e.eek
              File "testrunner-ex/sample2/sampletests_e.py", line 28, in eek
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_e.py", line 30,
                in sample2.sampletests_e.eek
            Failed example:
                f()
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_e.eek[0]>", line 1, in ?
                    f()
                  File "testrunner-ex/sample2/sampletests_e.py", line 19, in f
                    g()
                  File "testrunner-ex/sample2/sampletests_e.py", line 24, in g
                    x = y + 1
                   - __traceback_info__: I don't know what Y should be.
                NameError: global name 'y' is not defined
            <BLANKLINE>
            ...
            <BLANKLINE>
            <BLANKLINE>
            Error in test test3 (sample2.sampletests_e.Test)
            Traceback (most recent call last):
              File "testrunner-ex/sample2/sampletests_e.py", line 43, in test3
                f()
              File "testrunner-ex/sample2/sampletests_e.py", line 19, in f
                g()
              File "testrunner-ex/sample2/sampletests_e.py", line 24, in g
                x = y + 1
               - __traceback_info__: I don't know what Y should be.
            NameError: global name 'y' is not defined
            <BLANKLINE>
            ...
            <BLANKLINE>
            Failure in test testrunner-ex/sample2/e.txt
            Failed doctest test for e.txt
              File "testrunner-ex/sample2/e.txt", line 0
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/e.txt", line 4, in e.txt
            Failed example:
                f()
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest e.txt[1]>", line 1, in ?
                    f()
                  File "<doctest e.txt[0]>", line 2, in f
                    return x
                NameError: global name 'x' is not defined
            <BLANKLINE>
            .
            <BLANKLINE>
            Failure in test test (sample2.sampletests_f.Test)
            Traceback (most recent call last):
              File "testrunner-ex/sample2/sampletests_f.py", line 21, in test
                self.assertEqual(1,0)
              File ".../unittest.py", line 302, in failUnlessEqual
                raise self.failureException, \
            AssertionError: 1 != 0
            <BLANKLINE>
            ................................................................................................
            <BLANKLINE>
              Ran 164 tests with 3 failures, 1 errors and 0 skipped in 0.040 seconds.
            ...
            <BLANKLINE>
            Tests with errors:
               test3 (sample2.sampletests_e.Test)
            <BLANKLINE>
            Tests with failures:
               eek (sample2.sampletests_e)
               testrunner-ex/sample2/e.txt
               test (sample2.sampletests_f.Test)
            True
        
        Similarly for progress output, the progress ticker will be interrupted:
        
            >>> sys.argv = ('test --tests-pattern ^sampletests(f|_e|_f)?$ -u -ssample2'
            ...             ' -p').split()
            >>> testrunner.run_internal(defaults)
            ... # doctest: +NORMALIZE_WHITESPACE +REPORT_NDIFF
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Running:
                1/47 (2.1%)
            <BLANKLINE>
            Failure in test eek (sample2.sampletests_e)
            Failed doctest test for sample2.sampletests_e.eek
              File "testrunner-ex/sample2/sampletests_e.py", line 28, in eek
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_e.py", line 30, in sample2.sampletests_e.eek
            Failed example:
                f()
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_e.eek[0]>", line 1, in ?
                    f()
                  File "testrunner-ex/sample2/sampletests_e.py", line 19, in f
                    g()
                  File "testrunner-ex/sample2/sampletests_e.py", line 24, in g
                    x = y + 1
                   - __traceback_info__: I don't know what Y should be.
                NameError: global name 'y' is not defined
            <BLANKLINE>
                2/47 (4.3%)\r
                           \r
                3/47 (6.4%)\r
                           \r
                4/47 (8.5%)
            <BLANKLINE>
            Error in test test3 (sample2.sampletests_e.Test)
            Traceback (most recent call last):
              File "testrunner-ex/sample2/sampletests_e.py", line 43, in test3
                f()
              File "testrunner-ex/sample2/sampletests_e.py", line 19, in f
                g()
              File "testrunner-ex/sample2/sampletests_e.py", line 24, in g
                x = y + 1
               - __traceback_info__: I don't know what Y should be.
            NameError: global name 'y' is not defined
            <BLANKLINE>
                5/47 (10.6%)\r
                           \r
                6/47 (12.8%)\r
                            \r
                7/47 (14.9%)
            <BLANKLINE>
            Failure in test testrunner-ex/sample2/e.txt
            Failed doctest test for e.txt
              File "testrunner-ex/sample2/e.txt", line 0
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/e.txt", line 4, in e.txt
            Failed example:
                f()
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest e.txt[1]>", line 1, in ?
                    f()
                  File "<doctest e.txt[0]>", line 2, in f
                    return x
                NameError: global name 'x' is not defined
            <BLANKLINE>
                8/47 (17.0%)
            <BLANKLINE>
            Failure in test test (sample2.sampletests_f.Test)
            Traceback (most recent call last):
              File "testrunner-ex/sample2/sampletests_f.py", line 21, in test
                self.assertEqual(1,0)
              File ".../unittest.py", line 302, in failUnlessEqual
                raise self.failureException, \
            AssertionError: 1 != 0
            <BLANKLINE>
                9/47 (19.1%)\r
                            \r
                10/47 (21.3%)\r
                             \r
                11/47 (23.4%)\r
                             \r
                12/47 (25.5%)\r
                             \r
                13/47 (27.7%)\r
                             \r
                14/47 (29.8%)\r
                             \r
                15/47 (31.9%)\r
                             \r
                16/47 (34.0%)\r
                             \r
                17/47 (36.2%)\r
                             \r
                18/47 (38.3%)\r
                             \r
                19/47 (40.4%)\r
                             \r
                20/47 (42.6%)\r
                             \r
                21/47 (44.7%)\r
                             \r
                22/47 (46.8%)\r
                             \r
                23/47 (48.9%)\r
                             \r
                24/47 (51.1%)\r
                             \r
                25/47 (53.2%)\r
                             \r
                26/47 (55.3%)\r
                             \r
                27/47 (57.4%)\r
                             \r
                28/47 (59.6%)\r
                             \r
                29/47 (61.7%)\r
                             \r
                30/47 (63.8%)\r
                             \r
                31/47 (66.0%)\r
                             \r
                32/47 (68.1%)\r
                             \r
                33/47 (70.2%)\r
                             \r
                34/47 (72.3%)\r
                             \r
                35/47 (74.5%)\r
                             \r
                36/47 (76.6%)\r
                             \r
                37/47 (78.7%)\r
                             \r
                38/47 (80.9%)\r
                             \r
                39/47 (83.0%)\r
                             \r
                40/47 (85.1%)\r
                             \r
                41/47 (87.2%)\r
                             \r
                42/47 (89.4%)\r
                             \r
                43/47 (91.5%)\r
                             \r
                44/47 (93.6%)\r
                             \r
                45/47 (95.7%)\r
                             \r
                46/47 (97.9%)\r
                             \r
                47/47 (100.0%)\r
                              \r
            <BLANKLINE>
              Ran 47 tests with 3 failures, 1 errors and 0 skipped in 0.054 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            True
        
        If you also want a summary of errors at the end, ask for verbosity as well
        as progress output.
        
        
        Suppressing multiple doctest errors
        -----------------------------------
        
        Often, when a doctest example fails, the failure will cause later
        examples in the same test to fail.  Each failure is reported:
        
            >>> sys.argv = 'test --tests-pattern ^sampletests_1$'.split()
            >>> testrunner.run_internal(defaults) # doctest: +NORMALIZE_WHITESPACE
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Failure in test eek (sample2.sampletests_1)
            Failed doctest test for sample2.sampletests_1.eek
              File "testrunner-ex/sample2/sampletests_1.py", line 17, in eek
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_1.py", line 19,
                 in sample2.sampletests_1.eek
            Failed example:
                x = y
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_1.eek[0]>", line 1, in ?
                    x = y
                NameError: name 'y' is not defined
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_1.py", line 21,
                 in sample2.sampletests_1.eek
            Failed example:
                x
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_1.eek[1]>", line 1, in ?
                    x
                NameError: name 'x' is not defined
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_1.py", line 24,
                 in sample2.sampletests_1.eek
            Failed example:
                z = x + 1
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_1.eek[2]>", line 1, in ?
                    z = x + 1
                NameError: name 'x' is not defined
            <BLANKLINE>
              Ran 1 tests with 1 failures, 0 errors and 0 skipped in 0.002 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            True
        
        This can be a bit confusing, especially when there are enough tests
        that they scroll off a screen.  Often you just want to see the first
        failure.  This can be accomplished with the -1 option (for "just show
        me the first failed example in a doctest" :)
        
            >>> sys.argv = 'test --tests-pattern ^sampletests_1$ -1'.split()
            >>> testrunner.run_internal(defaults) # doctest:
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Failure in test eek (sample2.sampletests_1)
            Failed doctest test for sample2.sampletests_1.eek
              File "testrunner-ex/sample2/sampletests_1.py", line 17, in eek
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_1.py", line 19,
                 in sample2.sampletests_1.eek
            Failed example:
                x = y
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_1.eek[0]>", line 1, in ?
                    x = y
                NameError: name 'y' is not defined
            <BLANKLINE>
              Ran 1 tests with 1 failures, 0 errors and 0 skipped in 0.001 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            True
        
        The --hide-secondary-failures option is an alias for -1:
        
            >>> sys.argv = (
            ...     'test --tests-pattern ^sampletests_1$'
            ...     ' --hide-secondary-failures'
            ...     ).split()
            >>> testrunner.run_internal(defaults) # doctest:
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Failure in test eek (sample2.sampletests_1)
            Failed doctest test for sample2.sampletests_1.eek
              File "testrunner-ex/sample2/sampletests_1.py", line 17, in eek
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_1.py", line 19, in sample2.sampletests_1.eek
            Failed example:
                x = y
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_1.eek[0]>", line 1, in ?
                    x = y
                NameError: name 'y' is not defined
            <BLANKLINE>
              Ran 1 tests with 1 failures, 0 errors and 0 skipped in 0.001 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            True
        
        The --show-secondary-failures option counters -1 (or it's alias),
        causing the second and subsequent errors to be shown.  This is useful
        if -1 is provided by a test script by inserting it ahead of
        command-line options in sys.argv.
        
            >>> sys.argv = (
            ...     'test --tests-pattern ^sampletests_1$'
            ...     ' --hide-secondary-failures --show-secondary-failures'
            ...     ).split()
            >>> testrunner.run_internal(defaults) # doctest: +NORMALIZE_WHITESPACE
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Failure in test eek (sample2.sampletests_1)
            Failed doctest test for sample2.sampletests_1.eek
              File "testrunner-ex/sample2/sampletests_1.py", line 17, in eek
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_1.py", line 19, in sample2.sampletests_1.eek
            Failed example:
                x = y
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_1.eek[0]>", line 1, in ?
                    x = y
                NameError: name 'y' is not defined
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_1.py", line 21, in sample2.sampletests_1.eek
            Failed example:
                x
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_1.eek[1]>", line 1, in ?
                    x
                NameError: name 'x' is not defined
            ----------------------------------------------------------------------
            File "testrunner-ex/sample2/sampletests_1.py", line 24, in sample2.sampletests_1.eek
            Failed example:
                z = x + 1
            Exception raised:
                Traceback (most recent call last):
                  File ".../doctest.py", line 1256, in __run
                    compileflags, 1) in test.globs
                  File "<doctest sample2.sampletests_1.eek[2]>", line 1, in ?
                    z = x + 1
                NameError: name 'x' is not defined
            <BLANKLINE>
              Ran 1 tests with 1 failures, 0 errors and 0 skipped in 0.002 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            True
        
        
        Getting diff output for doctest failures
        ----------------------------------------
        
        If a doctest has large expected and actual output, it can be hard to
        see differences when expected and actual output differ.  The --ndiff,
        --udiff, and --cdiff options can be used to get diff output of various
        kinds.
        
            >>> sys.argv = 'test --tests-pattern ^pledge$'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Failure in test pledge (pledge)
            Failed doctest test for pledge.pledge
              File "testrunner-ex/pledge.py", line 24, in pledge
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/pledge.py", line 26, in pledge.pledge
            Failed example:
                print_pledge()
            Expected:
                I give my pledge, as an earthling,
                to save, and faithfully, to defend from waste,
                the natural resources of my planet.
                It's soils, minerals, forests, waters, and wildlife.
                <BLANKLINE>
            Got:
                I give my pledge, as and earthling,
                to save, and faithfully, to defend from waste,
                the natural resources of my planet.
                It's soils, minerals, forests, waters, and wildlife.
                <BLANKLINE>
            <BLANKLINE>
              Ran 1 tests with 1 failures, 0 errors and 0 skipped in 0.002 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
        Here, the actual output uses the word "and" rather than the word "an",
        but it's a bit hard to pick this out.  We can use the various diff
        outputs to see this better. We could modify the test to ask for diff
        output, but it's easier to use one of the diff options.
        
        The --ndiff option requests a diff using Python's ndiff utility. This
        is the only method that marks differences within lines as well as
        across lines. For example, if a line of expected output contains digit
        1 where actual output contains letter l, a line is inserted with a
        caret marking the mismatching column positions.
        
            >>> sys.argv = 'test --tests-pattern ^pledge$ --ndiff'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Failure in test pledge (pledge)
            Failed doctest test for pledge.pledge
              File "testrunner-ex/pledge.py", line 24, in pledge
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/pledge.py", line 26, in pledge.pledge
            Failed example:
                print_pledge()
            Differences (ndiff with -expected +actual):
                - I give my pledge, as an earthling,
                + I give my pledge, as and earthling,
                ?                        +
                  to save, and faithfully, to defend from waste,
                  the natural resources of my planet.
                  It's soils, minerals, forests, waters, and wildlife.
                <BLANKLINE>
            <BLANKLINE>
              Ran 1 tests with 1 failures, 0 errors and 0 skipped in 0.003 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
        The -udiff option requests a standard "unified" diff:
        
            >>> sys.argv = 'test --tests-pattern ^pledge$ --udiff'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Failure in test pledge (pledge)
            Failed doctest test for pledge.pledge
              File "testrunner-ex/pledge.py", line 24, in pledge
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/pledge.py", line 26, in pledge.pledge
            Failed example:
                print_pledge()
            Differences (unified diff with -expected +actual):
                @@ -1,3 +1,3 @@
                -I give my pledge, as an earthling,
                +I give my pledge, as and earthling,
                 to save, and faithfully, to defend from waste,
                 the natural resources of my planet.
            <BLANKLINE>
              Ran 1 tests with 1 failures, 0 errors and 0 skipped in 0.002 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
        The -cdiff option requests a standard "context" diff:
        
            >>> sys.argv = 'test --tests-pattern ^pledge$ --cdiff'.split()
            >>> _ = testrunner.run_internal(defaults)
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            <BLANKLINE>
            <BLANKLINE>
            Failure in test pledge (pledge)
            Failed doctest test for pledge.pledge
              File "testrunner-ex/pledge.py", line 24, in pledge
            <BLANKLINE>
            ----------------------------------------------------------------------
            File "testrunner-ex/pledge.py", line 26, in pledge.pledge
            Failed example:
                print_pledge()
            Differences (context diff with expected followed by actual):
                ***************
                *** 1,3 ****
                ! I give my pledge, as an earthling,
                  to save, and faithfully, to defend from waste,
                  the natural resources of my planet.
                --- 1,3 ----
                ! I give my pledge, as and earthling,
                  to save, and faithfully, to defend from waste,
                  the natural resources of my planet.
            <BLANKLINE>
              Ran 1 tests with 1 failures, 0 errors and 0 skipped in 0.002 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
        
        Specifying more than one diff option at once causes an error:
        
            >>> sys.argv = 'test --tests-pattern ^pledge$ --cdiff --udiff'.split()
            >>> _ = testrunner.run_internal(defaults)
            Traceback (most recent call last):
            ...
            SystemExit: 1
        
            >>> sys.argv = 'test --tests-pattern ^pledge$ --cdiff --ndiff'.split()
            >>> _ = testrunner.run_internal(defaults)
            Traceback (most recent call last):
            ...
            SystemExit: 1
        
            >>> sys.argv = 'test --tests-pattern ^pledge$ --udiff --ndiff'.split()
            >>> _ = testrunner.run_internal(defaults)
            Traceback (most recent call last):
            ...
            SystemExit: 1
        
        
        Testing-Module Import Errors
        ----------------------------
        
        If there are errors when importing a test module, these errors are
        reported.  In order to illustrate a module with a syntax error, we create
        one now:  this module used to be checked in to the project, but then it was
        included in distributions of projects using zope.testrunner too, and distutils
        complained about the syntax error when it compiled Python files during
        installation of such projects.  So first we create a module with bad syntax:
        
            >>> badsyntax_path = os.path.join(directory_with_tests,
            ...                               "sample2", "sampletests_i.py")
            >>> f = open(badsyntax_path, "w")
            >>> print("importx unittest", file=f)  # syntax error
            >>> f.close()
        
        Then run the tests:
        
            >>> sys.argv = ('test --tests-pattern ^sampletests(f|_i)?$ --layer 1 '
            ...            ).split()
            >>> testrunner.run_internal(defaults)
            ... # doctest: +NORMALIZE_WHITESPACE
            Test-module import failures:
            <BLANKLINE>
            Module: sample2.sampletests_i
            <BLANKLINE>
            Traceback (most recent call last):
              File "testrunner-ex/sample2/sampletests_i.py", line 1
                importx unittest
                               ^
            SyntaxError: invalid syntax
            <BLANKLINE>
            <BLANKLINE>
            Module: sample2.sample21.sampletests_i
            <BLANKLINE>
            Traceback (most recent call last):
              File "testrunner-ex/sample2/sample21/sampletests_i.py", line 15, in ?
                import zope.testrunner.huh
            ImportError: No module named huh
            <BLANKLINE>
            <BLANKLINE>
            Module: sample2.sample23.sampletests_i
            <BLANKLINE>
            Traceback (most recent call last):
              File "testrunner-ex/sample2/sample23/sampletests_i.py", line 18, in ?
                class Test(unittest.TestCase):
              File "testrunner-ex/sample2/sample23/sampletests_i.py", line 23, in Test
                raise TypeError('eek')
            TypeError: eek
            <BLANKLINE>
            <BLANKLINE>
            Running samplelayers.Layer1 tests:
              Set up samplelayers.Layer1 in 0.000 seconds.
              Ran 9 tests with 0 failures, 3 errors and 0 skipped in 0.000 seconds.
            Running samplelayers.Layer11 tests:
              Set up samplelayers.Layer11 in 0.000 seconds.
              Ran 26 tests with 0 failures, 3 errors and 0 skipped in 0.007 seconds.
            Running samplelayers.Layer111 tests:
              Set up samplelayers.Layerx in 0.000 seconds.
              Set up samplelayers.Layer111 in 0.000 seconds.
              Ran 26 tests with 0 failures, 3 errors and 0 skipped in 0.007 seconds.
            Running samplelayers.Layer112 tests:
              Tear down samplelayers.Layer111 in 0.000 seconds.
              Set up samplelayers.Layer112 in 0.000 seconds.
              Ran 26 tests with 0 failures, 3 errors and 0 skipped in 0.007 seconds.
            Running samplelayers.Layer12 tests:
              Tear down samplelayers.Layer112 in 0.000 seconds.
              Tear down samplelayers.Layerx in 0.000 seconds.
              Tear down samplelayers.Layer11 in 0.000 seconds.
              Set up samplelayers.Layer12 in 0.000 seconds.
              Ran 26 tests with 0 failures, 3 errors and 0 skipped in 0.007 seconds.
            Running samplelayers.Layer121 tests:
              Set up samplelayers.Layer121 in 0.000 seconds.
              Ran 26 tests with 0 failures, 3 errors and 0 skipped in 0.007 seconds.
            Running samplelayers.Layer122 tests:
              Tear down samplelayers.Layer121 in 0.000 seconds.
              Set up samplelayers.Layer122 in 0.000 seconds.
              Ran 26 tests with 0 failures, 3 errors and 0 skipped in 0.006 seconds.
            Tearing down left over layers:
              Tear down samplelayers.Layer122 in 0.000 seconds.
              Tear down samplelayers.Layer12 in 0.000 seconds.
              Tear down samplelayers.Layer1 in 0.000 seconds.
            <BLANKLINE>
            Test-modules with import problems:
              sample2.sampletests_i
              sample2.sample21.sampletests_i
              sample2.sample23.sampletests_i
            Total: 165 tests, 0 failures, 3 errors and 0 skipped in N.NNN seconds.
            True
        
        
        Reporting Errors to Calling Processes
        -------------------------------------
        
        The testrunner returns the error status, indicating that the tests
        failed.  This can be useful for an invoking process that wants to
        monitor the result of a test run.
        
        This is applied when invoking the testrunner using the ``run()`` function
        instead of ``run_internal()``:
        
            >>> sys.argv = (
            ...     'test --tests-pattern ^sampletests_1$'.split())
            >>> try:
            ...     testrunner.run(defaults)
            ... except SystemExit as e:
            ...     print('exited with code', e.code)
            ... else:
            ...     print('sys.exit was not called')
            ... # doctest: +ELLIPSIS
            Running zope.testrunner.layer.UnitTests tests:
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
            ...
              Ran 1 tests with 1 failures, 0 errors and 0 skipped in 0.002 seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            exited with code 1
        
        Passing tests exit with code 0 according to UNIX practices:
        
            >>> sys.argv = (
            ...     'test --tests-pattern ^sampletests$'.split())
            >>> try:
            ...     testrunner.run(defaults)
            ... except SystemExit as e2:
            ...     print('exited with code', e2.code)
            ... else:
            ...     print('sys.exit was not called')
            ... # doctest: +ELLIPSIS
            Running samplelayers.Layer11 tests:
            ...
            Running zope.testrunner.layer.UnitTests tests:
              Tear down samplelayers.Layer122 in N.NNN seconds.
              Tear down samplelayers.Layer12 in N.NNN seconds.
              Tear down samplelayers.Layer1 in N.NNN seconds.
              Set up zope.testrunner.layer.UnitTests in N.NNN seconds.
              Ran 130 tests with 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            Tearing down left over layers:
              Tear down zope.testrunner.layer.UnitTests in N.NNN seconds.
            Total: 286 tests, 0 failures, 0 errors and 0 skipped in N.NNN seconds.
            exited with code 0
        
        And remove the temporary directory:
        
            >>> shutil.rmtree(tmpdir)
        
        
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Console
Classifier: Framework :: Zope3
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: Zope Public License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.2
Classifier: Programming Language :: Python :: 3.3
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Topic :: Software Development :: Testing