/usr/share/pyshared/testtools/tests/test_deferredruntest.py is in python-testtools 0.9.14-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""Tests for the DeferredRunTest single test execution logic."""
import os
import signal
from testtools import (
skipIf,
TestCase,
TestResult,
)
from testtools.content import (
text_content,
)
from testtools.helpers import try_import
from testtools.matchers import (
Equals,
KeysEqual,
MatchesException,
Raises,
)
from testtools.runtest import RunTest
from testtools.testresult.doubles import ExtendedTestResult
from testtools.tests.test_spinner import NeedsTwistedTestCase
assert_fails_with = try_import('testtools.deferredruntest.assert_fails_with')
AsynchronousDeferredRunTest = try_import(
'testtools.deferredruntest.AsynchronousDeferredRunTest')
flush_logged_errors = try_import(
'testtools.deferredruntest.flush_logged_errors')
SynchronousDeferredRunTest = try_import(
'testtools.deferredruntest.SynchronousDeferredRunTest')
defer = try_import('twisted.internet.defer')
failure = try_import('twisted.python.failure')
log = try_import('twisted.python.log')
DelayedCall = try_import('twisted.internet.base.DelayedCall')
class X(object):
"""Tests that we run as part of our tests, nested to avoid discovery."""
class Base(TestCase):
def setUp(self):
super(X.Base, self).setUp()
self.calls = ['setUp']
self.addCleanup(self.calls.append, 'clean-up')
def test_something(self):
self.calls.append('test')
def tearDown(self):
self.calls.append('tearDown')
super(X.Base, self).tearDown()
class ErrorInSetup(Base):
expected_calls = ['setUp', 'clean-up']
expected_results = [('addError', RuntimeError)]
def setUp(self):
super(X.ErrorInSetup, self).setUp()
raise RuntimeError("Error in setUp")
class ErrorInTest(Base):
expected_calls = ['setUp', 'tearDown', 'clean-up']
expected_results = [('addError', RuntimeError)]
def test_something(self):
raise RuntimeError("Error in test")
class FailureInTest(Base):
expected_calls = ['setUp', 'tearDown', 'clean-up']
expected_results = [('addFailure', AssertionError)]
def test_something(self):
self.fail("test failed")
class ErrorInTearDown(Base):
expected_calls = ['setUp', 'test', 'clean-up']
expected_results = [('addError', RuntimeError)]
def tearDown(self):
raise RuntimeError("Error in tearDown")
class ErrorInCleanup(Base):
expected_calls = ['setUp', 'test', 'tearDown', 'clean-up']
expected_results = [('addError', ZeroDivisionError)]
def test_something(self):
self.calls.append('test')
self.addCleanup(lambda: 1/0)
class TestIntegration(NeedsTwistedTestCase):
def assertResultsMatch(self, test, result):
events = list(result._events)
self.assertEqual(('startTest', test), events.pop(0))
for expected_result in test.expected_results:
result = events.pop(0)
if len(expected_result) == 1:
self.assertEqual((expected_result[0], test), result)
else:
self.assertEqual((expected_result[0], test), result[:2])
error_type = expected_result[1]
self.assertIn(error_type.__name__, str(result[2]))
self.assertEqual([('stopTest', test)], events)
def test_runner(self):
result = ExtendedTestResult()
test = self.test_factory('test_something', runTest=self.runner)
test.run(result)
self.assertEqual(test.calls, self.test_factory.expected_calls)
self.assertResultsMatch(test, result)
def make_integration_tests():
from unittest import TestSuite
from testtools import clone_test_with_new_id
runners = [
('RunTest', RunTest),
('SynchronousDeferredRunTest', SynchronousDeferredRunTest),
('AsynchronousDeferredRunTest', AsynchronousDeferredRunTest),
]
tests = [
X.ErrorInSetup,
X.ErrorInTest,
X.ErrorInTearDown,
X.FailureInTest,
X.ErrorInCleanup,
]
base_test = X.TestIntegration('test_runner')
integration_tests = []
for runner_name, runner in runners:
for test in tests:
new_test = clone_test_with_new_id(
base_test, '%s(%s, %s)' % (
base_test.id(),
runner_name,
test.__name__))
new_test.test_factory = test
new_test.runner = runner
integration_tests.append(new_test)
return TestSuite(integration_tests)
class TestSynchronousDeferredRunTest(NeedsTwistedTestCase):
def make_result(self):
return ExtendedTestResult()
def make_runner(self, test):
return SynchronousDeferredRunTest(test, test.exception_handlers)
def test_success(self):
class SomeCase(TestCase):
def test_success(self):
return defer.succeed(None)
test = SomeCase('test_success')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
self.assertThat(
result._events, Equals([
('startTest', test),
('addSuccess', test),
('stopTest', test)]))
def test_failure(self):
class SomeCase(TestCase):
def test_failure(self):
return defer.maybeDeferred(self.fail, "Egads!")
test = SomeCase('test_failure')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
self.assertThat(
[event[:2] for event in result._events], Equals([
('startTest', test),
('addFailure', test),
('stopTest', test)]))
def test_setUp_followed_by_test(self):
class SomeCase(TestCase):
def setUp(self):
super(SomeCase, self).setUp()
return defer.succeed(None)
def test_failure(self):
return defer.maybeDeferred(self.fail, "Egads!")
test = SomeCase('test_failure')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
self.assertThat(
[event[:2] for event in result._events], Equals([
('startTest', test),
('addFailure', test),
('stopTest', test)]))
class TestAsynchronousDeferredRunTest(NeedsTwistedTestCase):
def make_reactor(self):
from twisted.internet import reactor
return reactor
def make_result(self):
return ExtendedTestResult()
def make_runner(self, test, timeout=None):
if timeout is None:
timeout = self.make_timeout()
return AsynchronousDeferredRunTest(
test, test.exception_handlers, timeout=timeout)
def make_timeout(self):
return 0.005
def test_setUp_returns_deferred_that_fires_later(self):
# setUp can return a Deferred that might fire at any time.
# AsynchronousDeferredRunTest will not go on to running the test until
# the Deferred returned by setUp actually fires.
call_log = []
marker = object()
d = defer.Deferred().addCallback(call_log.append)
class SomeCase(TestCase):
def setUp(self):
super(SomeCase, self).setUp()
call_log.append('setUp')
return d
def test_something(self):
call_log.append('test')
def fire_deferred():
self.assertThat(call_log, Equals(['setUp']))
d.callback(marker)
test = SomeCase('test_something')
timeout = self.make_timeout()
runner = self.make_runner(test, timeout=timeout)
result = self.make_result()
reactor = self.make_reactor()
reactor.callLater(timeout, fire_deferred)
runner.run(result)
self.assertThat(call_log, Equals(['setUp', marker, 'test']))
def test_calls_setUp_test_tearDown_in_sequence(self):
# setUp, the test method and tearDown can all return
# Deferreds. AsynchronousDeferredRunTest will make sure that each of
# these are run in turn, only going on to the next stage once the
# Deferred from the previous stage has fired.
call_log = []
a = defer.Deferred()
a.addCallback(lambda x: call_log.append('a'))
b = defer.Deferred()
b.addCallback(lambda x: call_log.append('b'))
c = defer.Deferred()
c.addCallback(lambda x: call_log.append('c'))
class SomeCase(TestCase):
def setUp(self):
super(SomeCase, self).setUp()
call_log.append('setUp')
return a
def test_success(self):
call_log.append('test')
return b
def tearDown(self):
super(SomeCase, self).tearDown()
call_log.append('tearDown')
return c
test = SomeCase('test_success')
timeout = self.make_timeout()
runner = self.make_runner(test, timeout)
result = self.make_result()
reactor = self.make_reactor()
def fire_a():
self.assertThat(call_log, Equals(['setUp']))
a.callback(None)
def fire_b():
self.assertThat(call_log, Equals(['setUp', 'a', 'test']))
b.callback(None)
def fire_c():
self.assertThat(
call_log, Equals(['setUp', 'a', 'test', 'b', 'tearDown']))
c.callback(None)
reactor.callLater(timeout * 0.25, fire_a)
reactor.callLater(timeout * 0.5, fire_b)
reactor.callLater(timeout * 0.75, fire_c)
runner.run(result)
self.assertThat(
call_log, Equals(['setUp', 'a', 'test', 'b', 'tearDown', 'c']))
def test_async_cleanups(self):
# Cleanups added with addCleanup can return
# Deferreds. AsynchronousDeferredRunTest will run each of them in
# turn.
class SomeCase(TestCase):
def test_whatever(self):
pass
test = SomeCase('test_whatever')
call_log = []
a = defer.Deferred().addCallback(lambda x: call_log.append('a'))
b = defer.Deferred().addCallback(lambda x: call_log.append('b'))
c = defer.Deferred().addCallback(lambda x: call_log.append('c'))
test.addCleanup(lambda: a)
test.addCleanup(lambda: b)
test.addCleanup(lambda: c)
def fire_a():
self.assertThat(call_log, Equals([]))
a.callback(None)
def fire_b():
self.assertThat(call_log, Equals(['a']))
b.callback(None)
def fire_c():
self.assertThat(call_log, Equals(['a', 'b']))
c.callback(None)
timeout = self.make_timeout()
reactor = self.make_reactor()
reactor.callLater(timeout * 0.25, fire_a)
reactor.callLater(timeout * 0.5, fire_b)
reactor.callLater(timeout * 0.75, fire_c)
runner = self.make_runner(test, timeout)
result = self.make_result()
runner.run(result)
self.assertThat(call_log, Equals(['a', 'b', 'c']))
def test_clean_reactor(self):
# If there's cruft left over in the reactor, the test fails.
reactor = self.make_reactor()
timeout = self.make_timeout()
class SomeCase(TestCase):
def test_cruft(self):
reactor.callLater(timeout * 10.0, lambda: None)
test = SomeCase('test_cruft')
runner = self.make_runner(test, timeout)
result = self.make_result()
runner.run(result)
self.assertThat(
[event[:2] for event in result._events],
Equals(
[('startTest', test),
('addError', test),
('stopTest', test)]))
error = result._events[1][2]
self.assertThat(error, KeysEqual('traceback', 'twisted-log'))
def test_exports_reactor(self):
# The reactor is set as an attribute on the test case.
reactor = self.make_reactor()
timeout = self.make_timeout()
class SomeCase(TestCase):
def test_cruft(self):
self.assertIs(reactor, self.reactor)
test = SomeCase('test_cruft')
runner = self.make_runner(test, timeout)
result = TestResult()
runner.run(result)
self.assertEqual([], result.errors)
self.assertEqual([], result.failures)
def test_unhandled_error_from_deferred(self):
# If there's a Deferred with an unhandled error, the test fails. Each
# unhandled error is reported with a separate traceback.
class SomeCase(TestCase):
def test_cruft(self):
# Note we aren't returning the Deferred so that the error will
# be unhandled.
defer.maybeDeferred(lambda: 1/0)
defer.maybeDeferred(lambda: 2/0)
test = SomeCase('test_cruft')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
error = result._events[1][2]
result._events[1] = ('addError', test, None)
self.assertThat(result._events, Equals(
[('startTest', test),
('addError', test, None),
('stopTest', test)]))
self.assertThat(
error, KeysEqual(
'twisted-log',
'unhandled-error-in-deferred',
'unhandled-error-in-deferred-1',
))
def test_unhandled_error_from_deferred_combined_with_error(self):
# If there's a Deferred with an unhandled error, the test fails. Each
# unhandled error is reported with a separate traceback, and the error
# is still reported.
class SomeCase(TestCase):
def test_cruft(self):
# Note we aren't returning the Deferred so that the error will
# be unhandled.
defer.maybeDeferred(lambda: 1/0)
2 / 0
test = SomeCase('test_cruft')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
error = result._events[1][2]
result._events[1] = ('addError', test, None)
self.assertThat(result._events, Equals(
[('startTest', test),
('addError', test, None),
('stopTest', test)]))
self.assertThat(
error, KeysEqual(
'traceback',
'twisted-log',
'unhandled-error-in-deferred',
))
@skipIf(os.name != "posix", "Sending SIGINT with os.kill is posix only")
def test_keyboard_interrupt_stops_test_run(self):
# If we get a SIGINT during a test run, the test stops and no more
# tests run.
SIGINT = getattr(signal, 'SIGINT', None)
if not SIGINT:
raise self.skipTest("SIGINT unavailable")
class SomeCase(TestCase):
def test_pause(self):
return defer.Deferred()
test = SomeCase('test_pause')
reactor = self.make_reactor()
timeout = self.make_timeout()
runner = self.make_runner(test, timeout * 5)
result = self.make_result()
reactor.callLater(timeout, os.kill, os.getpid(), SIGINT)
self.assertThat(lambda:runner.run(result),
Raises(MatchesException(KeyboardInterrupt)))
@skipIf(os.name != "posix", "Sending SIGINT with os.kill is posix only")
def test_fast_keyboard_interrupt_stops_test_run(self):
# If we get a SIGINT during a test run, the test stops and no more
# tests run.
SIGINT = getattr(signal, 'SIGINT', None)
if not SIGINT:
raise self.skipTest("SIGINT unavailable")
class SomeCase(TestCase):
def test_pause(self):
return defer.Deferred()
test = SomeCase('test_pause')
reactor = self.make_reactor()
timeout = self.make_timeout()
runner = self.make_runner(test, timeout * 5)
result = self.make_result()
reactor.callWhenRunning(os.kill, os.getpid(), SIGINT)
self.assertThat(lambda:runner.run(result),
Raises(MatchesException(KeyboardInterrupt)))
def test_timeout_causes_test_error(self):
# If a test times out, it reports itself as having failed with a
# TimeoutError.
class SomeCase(TestCase):
def test_pause(self):
return defer.Deferred()
test = SomeCase('test_pause')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
error = result._events[1][2]
self.assertThat(
[event[:2] for event in result._events], Equals(
[('startTest', test),
('addError', test),
('stopTest', test)]))
self.assertIn('TimeoutError', str(error['traceback']))
def test_convenient_construction(self):
# As a convenience method, AsynchronousDeferredRunTest has a
# classmethod that returns an AsynchronousDeferredRunTest
# factory. This factory has the same API as the RunTest constructor.
reactor = object()
timeout = object()
handler = object()
factory = AsynchronousDeferredRunTest.make_factory(reactor, timeout)
runner = factory(self, [handler])
self.assertIs(reactor, runner._reactor)
self.assertIs(timeout, runner._timeout)
self.assertIs(self, runner.case)
self.assertEqual([handler], runner.handlers)
def test_use_convenient_factory(self):
# Make sure that the factory can actually be used.
factory = AsynchronousDeferredRunTest.make_factory()
class SomeCase(TestCase):
run_tests_with = factory
def test_something(self):
pass
case = SomeCase('test_something')
case.run()
def test_convenient_construction_default_reactor(self):
# As a convenience method, AsynchronousDeferredRunTest has a
# classmethod that returns an AsynchronousDeferredRunTest
# factory. This factory has the same API as the RunTest constructor.
reactor = object()
handler = object()
factory = AsynchronousDeferredRunTest.make_factory(reactor=reactor)
runner = factory(self, [handler])
self.assertIs(reactor, runner._reactor)
self.assertIs(self, runner.case)
self.assertEqual([handler], runner.handlers)
def test_convenient_construction_default_timeout(self):
# As a convenience method, AsynchronousDeferredRunTest has a
# classmethod that returns an AsynchronousDeferredRunTest
# factory. This factory has the same API as the RunTest constructor.
timeout = object()
handler = object()
factory = AsynchronousDeferredRunTest.make_factory(timeout=timeout)
runner = factory(self, [handler])
self.assertIs(timeout, runner._timeout)
self.assertIs(self, runner.case)
self.assertEqual([handler], runner.handlers)
def test_convenient_construction_default_debugging(self):
# As a convenience method, AsynchronousDeferredRunTest has a
# classmethod that returns an AsynchronousDeferredRunTest
# factory. This factory has the same API as the RunTest constructor.
handler = object()
factory = AsynchronousDeferredRunTest.make_factory(debug=True)
runner = factory(self, [handler])
self.assertIs(self, runner.case)
self.assertEqual([handler], runner.handlers)
self.assertEqual(True, runner._debug)
def test_deferred_error(self):
class SomeTest(TestCase):
def test_something(self):
return defer.maybeDeferred(lambda: 1/0)
test = SomeTest('test_something')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
self.assertThat(
[event[:2] for event in result._events],
Equals([
('startTest', test),
('addError', test),
('stopTest', test)]))
error = result._events[1][2]
self.assertThat(error, KeysEqual('traceback', 'twisted-log'))
def test_only_addError_once(self):
# Even if the reactor is unclean and the test raises an error and the
# cleanups raise errors, we only called addError once per test.
reactor = self.make_reactor()
class WhenItRains(TestCase):
def it_pours(self):
# Add a dirty cleanup.
self.addCleanup(lambda: 3 / 0)
# Dirty the reactor.
from twisted.internet.protocol import ServerFactory
reactor.listenTCP(0, ServerFactory())
# Unhandled error.
defer.maybeDeferred(lambda: 2 / 0)
# Actual error.
raise RuntimeError("Excess precipitation")
test = WhenItRains('it_pours')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
self.assertThat(
[event[:2] for event in result._events],
Equals([
('startTest', test),
('addError', test),
('stopTest', test)]))
error = result._events[1][2]
self.assertThat(
error, KeysEqual(
'traceback',
'traceback-1',
'traceback-2',
'twisted-log',
'unhandled-error-in-deferred',
))
def test_log_err_is_error(self):
# An error logged during the test run is recorded as an error in the
# tests.
class LogAnError(TestCase):
def test_something(self):
try:
1/0
except ZeroDivisionError:
f = failure.Failure()
log.err(f)
test = LogAnError('test_something')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
self.assertThat(
[event[:2] for event in result._events],
Equals([
('startTest', test),
('addError', test),
('stopTest', test)]))
error = result._events[1][2]
self.assertThat(error, KeysEqual('logged-error', 'twisted-log'))
def test_log_err_flushed_is_success(self):
# An error logged during the test run is recorded as an error in the
# tests.
class LogAnError(TestCase):
def test_something(self):
try:
1/0
except ZeroDivisionError:
f = failure.Failure()
log.err(f)
flush_logged_errors(ZeroDivisionError)
test = LogAnError('test_something')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
self.assertThat(
result._events,
Equals([
('startTest', test),
('addSuccess', test, {'twisted-log': text_content('')}),
('stopTest', test)]))
def test_log_in_details(self):
class LogAnError(TestCase):
def test_something(self):
log.msg("foo")
1/0
test = LogAnError('test_something')
runner = self.make_runner(test)
result = self.make_result()
runner.run(result)
self.assertThat(
[event[:2] for event in result._events],
Equals([
('startTest', test),
('addError', test),
('stopTest', test)]))
error = result._events[1][2]
self.assertThat(error, KeysEqual('traceback', 'twisted-log'))
def test_debugging_unchanged_during_test_by_default(self):
debugging = [(defer.Deferred.debug, DelayedCall.debug)]
class SomeCase(TestCase):
def test_debugging_enabled(self):
debugging.append((defer.Deferred.debug, DelayedCall.debug))
test = SomeCase('test_debugging_enabled')
runner = AsynchronousDeferredRunTest(
test, handlers=test.exception_handlers,
reactor=self.make_reactor(), timeout=self.make_timeout())
runner.run(self.make_result())
self.assertEqual(debugging[0], debugging[1])
def test_debugging_enabled_during_test_with_debug_flag(self):
self.patch(defer.Deferred, 'debug', False)
self.patch(DelayedCall, 'debug', False)
debugging = []
class SomeCase(TestCase):
def test_debugging_enabled(self):
debugging.append((defer.Deferred.debug, DelayedCall.debug))
test = SomeCase('test_debugging_enabled')
runner = AsynchronousDeferredRunTest(
test, handlers=test.exception_handlers,
reactor=self.make_reactor(), timeout=self.make_timeout(),
debug=True)
runner.run(self.make_result())
self.assertEqual([(True, True)], debugging)
self.assertEqual(False, defer.Deferred.debug)
self.assertEqual(False, defer.Deferred.debug)
class TestAssertFailsWith(NeedsTwistedTestCase):
"""Tests for `assert_fails_with`."""
if SynchronousDeferredRunTest is not None:
run_tests_with = SynchronousDeferredRunTest
def test_assert_fails_with_success(self):
# assert_fails_with fails the test if it's given a Deferred that
# succeeds.
marker = object()
d = assert_fails_with(defer.succeed(marker), RuntimeError)
def check_result(failure):
failure.trap(self.failureException)
self.assertThat(
str(failure.value),
Equals("RuntimeError not raised (%r returned)" % (marker,)))
d.addCallbacks(
lambda x: self.fail("Should not have succeeded"), check_result)
return d
def test_assert_fails_with_success_multiple_types(self):
# assert_fails_with fails the test if it's given a Deferred that
# succeeds.
marker = object()
d = assert_fails_with(
defer.succeed(marker), RuntimeError, ZeroDivisionError)
def check_result(failure):
failure.trap(self.failureException)
self.assertThat(
str(failure.value),
Equals("RuntimeError, ZeroDivisionError not raised "
"(%r returned)" % (marker,)))
d.addCallbacks(
lambda x: self.fail("Should not have succeeded"), check_result)
return d
def test_assert_fails_with_wrong_exception(self):
# assert_fails_with fails the test if it's given a Deferred that
# succeeds.
d = assert_fails_with(
defer.maybeDeferred(lambda: 1/0), RuntimeError, KeyboardInterrupt)
def check_result(failure):
failure.trap(self.failureException)
lines = str(failure.value).splitlines()
self.assertThat(
lines[:2],
Equals([
("ZeroDivisionError raised instead of RuntimeError, "
"KeyboardInterrupt:"),
" Traceback (most recent call last):",
]))
d.addCallbacks(
lambda x: self.fail("Should not have succeeded"), check_result)
return d
def test_assert_fails_with_expected_exception(self):
# assert_fails_with calls back with the value of the failure if it's
# one of the expected types of failures.
try:
1/0
except ZeroDivisionError:
f = failure.Failure()
d = assert_fails_with(defer.fail(f), ZeroDivisionError)
return d.addCallback(self.assertThat, Equals(f.value))
def test_custom_failure_exception(self):
# If assert_fails_with is passed a 'failureException' keyword
# argument, then it will raise that instead of `AssertionError`.
class CustomException(Exception):
pass
marker = object()
d = assert_fails_with(
defer.succeed(marker), RuntimeError,
failureException=CustomException)
def check_result(failure):
failure.trap(CustomException)
self.assertThat(
str(failure.value),
Equals("RuntimeError not raised (%r returned)" % (marker,)))
return d.addCallbacks(
lambda x: self.fail("Should not have succeeded"), check_result)
class TestRunWithLogObservers(NeedsTwistedTestCase):
def test_restores_observers(self):
from testtools.deferredruntest import run_with_log_observers
from twisted.python import log
# Make sure there's at least one observer. This reproduces bug
# #926189.
log.addObserver(lambda *args: None)
observers = list(log.theLogPublisher.observers)
run_with_log_observers([], lambda: None)
self.assertEqual(observers, log.theLogPublisher.observers)
def test_suite():
from unittest import TestLoader, TestSuite
return TestSuite(
[TestLoader().loadTestsFromName(__name__),
make_integration_tests()])
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