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Metadata-Version: 1.1
Name: PyHamcrest
Version: 1.8.0
Summary: Hamcrest framework for matcher objects
Home-page: https://github.com/hamcrest/PyHamcrest
Author: Chris Rose
Author-email: offline@offby1.net
License: New BSD
Download-URL: http://pypi.python.org/packages/source/P/PyHamcrest/PyHamcrest-1.8.0.tar.gz
Description: PyHamcrest
        ==========
        
        .. image:: https://pypip.in/v/PyHamcrest/badge.png
                :alt: Release Status
                :target: https://crate.io/packages/PyHamcrest
        .. image:: https://pypip.in/d/PyHamcrest/badge.png
                :alt: Downloads
                :target: https://crate.io/packages/PyHamcrest
        .. image:: https://travis-ci.org/hamcrest/PyHamcrest.png?branch=master
                :alt: Build Status
                :target: https://travis-ci.org/hamcrest/PyHamcrest
        
        Introduction
        ============
        
        PyHamcrest is a framework for writing matcher objects, allowing you to
        declaratively define "match" rules. There are a number of situations where
        matchers are invaluable, such as UI validation, or data filtering, but it is in
        the area of writing flexible tests that matchers are most commonly used. This
        tutorial shows you how to use PyHamcrest for unit testing.
        
        When writing tests it is sometimes difficult to get the balance right between
        overspecifying the test (and making it brittle to changes), and not specifying
        enough (making the test less valuable since it continues to pass even when the
        thing being tested is broken). Having a tool that allows you to pick out
        precisely the aspect under test and describe the values it should have, to a
        controlled level of precision, helps greatly in writing tests that are "just
        right." Such tests fail when the behavior of the aspect under test deviates
        from the expected behavior, yet continue to pass when minor, unrelated changes
        to the behaviour are made.
        
        Installation
        ============
        
        Hamcrest can be installed using the usual Python packaging tools. It depends on
        distribute, but as long as you have a network connection when you install, the
        installation process will take care of that for you.
        
        My first PyHamcrest test
        ========================
        
        We'll start by writing a very simple PyUnit test, but instead of using PyUnit's
        ``assertEqual`` method, we'll use PyHamcrest's ``assert_that`` construct and
        the standard set of matchers:
        
        .. code:: python
        
         from hamcrest import *
         import unittest
        
         class BiscuitTest(unittest.TestCase):
             def testEquals(self):
                 theBiscuit = Biscuit('Ginger')
                 myBiscuit = Biscuit('Ginger')
                 assert_that(theBiscuit, equal_to(myBiscuit))
        
         if __name__ == '__main__':
             unittest.main()
        
        The ``assert_that`` function is a stylized sentence for making a test
        assertion. In this example, the subject of the assertion is the object
        ``theBiscuit``, which is the first method parameter. The second method
        parameter is a matcher for ``Biscuit`` objects, here a matcher that checks one
        object is equal to another using the Python ``==`` operator. The test passes
        since the ``Biscuit`` class defines an ``__eq__`` method.
        
        If you have more than one assertion in your test you can include an identifier
        for the tested value in the assertion:
        
        .. code:: python
        
         assert_that(theBiscuit.getChocolateChipCount(), equal_to(10), 'chocolate chips')
         assert_that(theBiscuit.getHazelnutCount(), equal_to(3), 'hazelnuts')
        
        As a convenience, assert_that can also be used to verify a boolean condition:
        
        .. code:: python
        
         assert_that(theBiscuit.isCooked(), 'cooked')
        
        This is equivalent to the ``assert_`` method of unittest.TestCase, but because
        it's a standalone function, it offers greater flexibility in test writing.
        
        
        Predefined matchers
        ===================
        
        PyHamcrest comes with a library of useful matchers:
        
        * Object
        
          * ``equal_to`` - match equal object
          * ``has_length`` - match ``len()``
          * ``has_property`` - match value of property with given name
          * ``has_properties`` - match an object that has all of the given properties.
          * ``has_string`` - match ``str()``
          * ``instance_of`` - match object type
          * ``none``, ``not_none`` - match ``None``, or not ``None``
          * ``same_instance`` - match same object
        
        * Number
        
          * ``close_to`` - match number close to a given value
          * ``greater_than``, ``greater_than_or_equal_to``, ``less_than``,
            ``less_than_or_equal_to`` - match numeric ordering
        
        * Text
        
          * ``contains_string`` - match part of a string
          * ``ends_with`` - match the end of a string
          * ``equal_to_ignoring_case`` - match the complete string but ignore case
          * ``equal_to_ignoring_whitespace`` - match the complete string but ignore extra whitespace
          * ``matches_regexp`` - match a regular expression in a string
          * ``starts_with`` - match the beginning of a string
          * ``string_contains_in_order`` - match parts of a string, in relative order
        
        * Logical
        
          * ``all_of`` - ``and`` together all matchers
          * ``any_of`` - ``or`` together all matchers
          * ``anything`` - match anything, useful in composite matchers when you don't care about a particular value
          * ``is_not`` - negate the matcher
        
        * Sequence
        
          * ``contains`` - exactly match the entire sequence
          * ``contains_inanyorder`` - match the entire sequence, but in any order
          * ``has_item`` - match if given item appears in the sequence
          * ``has_items`` - match if all given items appear in the sequence, in any order
          * ``is_in`` - match if item appears in the given sequence
          * ``only_contains`` - match if sequence's items appear in given list
        
        * Dictionary
        
          * ``has_entries`` - match dictionary with list of key-value pairs
          * ``has_entry`` - match dictionary containing a key-value pair
          * ``has_key`` - match dictionary with a key
          * ``has_value`` - match dictionary with a value
        
        * Decorator
        
          * ``calling`` - wrap a callable in a deffered object, for subsequent matching on calling behaviour
          * ``raises`` - Ensure that a deferred callable raises as expected
          * ``described_as`` - give the matcher a custom failure description
          * ``is_`` - decorator to improve readability - see `Syntactic sugar` below
        
        The arguments for many of these matchers accept not just a matching value, but
        another matcher, so matchers can be composed for greater flexibility. For
        example, ``only_contains(less_than(5))`` will match any sequence where every
        item is less than 5.
        
        
        Syntactic sugar
        ===============
        
        PyHamcrest strives to make your tests as readable as possible. For example, the
        ``is_`` matcher is a wrapper that doesn't add any extra behavior to the
        underlying matcher. The following assertions are all equivalent:
        
        .. code:: python
        
         assert_that(theBiscuit, equal_to(myBiscuit))
         assert_that(theBiscuit, is_(equal_to(myBiscuit)))
         assert_that(theBiscuit, is_(myBiscuit))
        
        The last form is allowed since ``is_(value)`` wraps most non-matcher arguments
        with ``equal_to``. But if the argument is a type, it is wrapped with
        ``instance_of``, so the following are also equivalent:
        
        .. code:: python
        
         assert_that(theBiscuit, instance_of(Biscuit))
         assert_that(theBiscuit, is_(instance_of(Biscuit)))
         assert_that(theBiscuit, is_(Biscuit))
        
        *Note that PyHamcrest's ``is_`` matcher is unrelated to Python's ``is``
        operator. The matcher for object identity is ``same_instance``.*
        
        
        Writing custom matchers
        =======================
        
        PyHamcrest comes bundled with lots of useful matchers, but you'll probably find
        that you need to create your own from time to time to fit your testing needs.
        This commonly occurs when you find a fragment of code that tests the same set
        of properties over and over again (and in different tests), and you want to
        bundle the fragment into a single assertion. By writing your own matcher you'll
        eliminate code duplication and make your tests more readable!
        
        Let's write our own matcher for testing if a calendar date falls on a Saturday.
        This is the test we want to write:
        
        .. code:: python
        
         def testDateIsOnASaturday(self):
             d = datetime.date(2008, 04, 26)
             assert_that(d, is_(on_a_saturday()))
        
        And here's the implementation:
        
        .. code:: python
        
         from hamcrest.core.base_matcher import BaseMatcher
         from hamcrest.core.helpers.hasmethod import hasmethod
        
         class IsGivenDayOfWeek(BaseMatcher):
        
             def __init__(self, day):
                 self.day = day  # Monday is 0, Sunday is 6
        
             def _matches(self, item):
                 if not hasmethod(item, 'weekday'):
                     return False
                 return item.weekday() == self.day
        
             def describe_to(self, description):
                 day_as_string = ['Monday', 'Tuesday', 'Wednesday', 'Thursday',
                                  'Friday', 'Saturday', 'Sunday']
                 description.append_text('calendar date falling on ')    \
                            .append_text(day_as_string[self.day])
        
         def on_a_saturday():
             return IsGivenDayOfWeek(5)
        
        For our Matcher implementation we implement the ``_matches`` method - which
        calls the ``weekday`` method after confirming that the argument (which may not
        be a date) has such a method - and the ``describe_to`` method - which is used
        to produce a failure message when a test fails. Here's an example of how the
        failure message looks:
        
        .. code:: python
        
         assert_that(datetime.date(2008, 04, 06), is_(on_a_saturday()))
        
        fails with the message::
        
            AssertionError:
            Expected: is calendar date falling on Saturday
                 got: <2008-04-06>
        
        Let's say this matcher is saved in a module named ``isgivendayofweek``. We
        could use it in our test by importing the factory function ``on_a_saturday``:
        
        .. code:: python
        
         from hamcrest import *
         import unittest
         from isgivendayofweek import on_a_saturday
        
         class DateTest(unittest.TestCase):
             def testDateIsOnASaturday(self):
                 d = datetime.date(2008, 04, 26)
                 assert_that(d, is_(on_a_saturday()))
        
         if __name__ == '__main__':
             unittest.main()
        
        Even though the ``on_a_saturday`` function creates a new matcher each time it
        is called, you should not assume this is the only usage pattern for your
        matcher. Therefore you should make sure your matcher is stateless, so a single
        instance can be reused between matches.
        
        
        More resources
        ==============
        
        * Documentation_
        * Package_
        * Sources_
        * Hamcrest_
        
        .. _Documentation: http://readthedocs.org/docs/pyhamcrest/en/V1.7.1/
        .. _Package: http://pypi.python.org/pypi/PyHamcrest
        .. _Sources: https://github.com/hamcrest/PyHamcrest
        .. _Hamcrest: http://hamcrest.org
        
Keywords: hamcrest matchers pyunit unit test testing unittest unittesting
Platform: All
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Natural Language :: English
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python :: 2.5
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3.2
Classifier: Programming Language :: Python :: 3.3
Classifier: Topic :: Software Development
Classifier: Topic :: Software Development :: Quality Assurance
Classifier: Topic :: Software Development :: Testing
Provides: hamcrest