def test__logs_failures_from_cancellers(self):
logger = self.useFixture(TwistedLoggerFixture())
canceller = Mock()
canceller.side_effect = factory.make_exception()
dhooks = DeferredHooks()
d = Deferred(canceller)
dhooks.add(d)
dhooks.reset()
self.assertThat(dhooks.hooks, HasLength(0))
# The hook has not been fired, but because the user-supplied canceller
# has failed we're not in a position to know what to do. This reflects
# a programming error and not a run-time error that we ought to be
# prepared for, so it is left as-is.
self.assertThat(d, IsUnfiredDeferred())
self.assertDocTestMatches(
dedent("""\
Failure when cancelling hook.
Traceback (most recent call last):
...
maastesting.factory.TestException#...
"""),
logger.output,
)
def test__reset_cancels_all_hooks(self):
canceller = Mock()
dhooks = DeferredHooks()
d1, d2 = Deferred(canceller), Deferred(canceller)
dhooks.add(d1)
dhooks.add(d2)
dhooks.reset()
self.assertThat(dhooks.hooks, HasLength(0))
self.assertThat(canceller, MockCallsMatch(call(d1), call(d2)))
def test__reset_suppresses_CancelledError(self):
logger = self.useFixture(TwistedLoggerFixture())
dhooks = DeferredHooks()
d = Deferred()
dhooks.add(d)
dhooks.reset()
self.assertThat(dhooks.hooks, HasLength(0))
self.assertThat(extract_result(d), Is(None))
self.assertEqual("", logger.output)
def test__reset_cancels_in_reactor(self):
def validate_in_reactor(_):
self.assertTrue(isInIOThread())
dhooks = DeferredHooks()
d = Deferred()
d.addBoth(validate_in_reactor)
dhooks.add(d)
dhooks.reset()
self.assertThat(dhooks.hooks, HasLength(0))
self.assertThat(d, IsFiredDeferred())
def test__logs_failures_from_cancelled_hooks(self):
logger = self.useFixture(TwistedLoggerFixture())
error = factory.make_exception()
dhooks = DeferredHooks()
d = Deferred()
d.addBoth(lambda _: Failure(error))
dhooks.add(d)
dhooks.reset()
self.assertThat(dhooks.hooks, HasLength(0))
self.assertThat(d, IsFiredDeferred())
self.assertDocTestMatches(
dedent("""\
Failure when cancelling hook.
Traceback (most recent call last):
...
maastesting.factory.TestException#...
"""), logger.output)
def test__logs_failures_from_cancellers_when_hook_already_fired(self):
logger = self.useFixture(TwistedLoggerFixture())
def canceller(d):
d.callback(None)
raise factory.make_exception()
dhooks = DeferredHooks()
d = Deferred(canceller)
dhooks.add(d)
dhooks.reset()
self.assertThat(dhooks.hooks, HasLength(0))
self.assertThat(d, IsFiredDeferred())
self.assertDocTestMatches(
dedent("""\
Failure when cancelling hook.
Traceback (most recent call last):
...
maastesting.factory.TestException#...
"""), logger.output)
