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# Copyright (c) testtools developers. See LICENSE for details.
"""Tests for testtools._deferred."""
from testtools.helpers import try_import
from testtools.matchers import (
Equals,
MatchesException,
Raises,
)
from ._helpers import NeedsTwistedTestCase
DeferredNotFired = try_import(
'testtools.twistedsupport._deferred.DeferredNotFired')
extract_result = try_import(
'testtools.twistedsupport._deferred.extract_result')
defer = try_import('twisted.internet.defer')
Failure = try_import('twisted.python.failure.Failure')
class TestExtractResult(NeedsTwistedTestCase):
"""Tests for ``extract_result``."""
def test_not_fired(self):
# _spinner.extract_result raises _spinner.DeferredNotFired if it's
# given a Deferred that has not fired.
self.assertThat(
lambda: extract_result(defer.Deferred()),
Raises(MatchesException(DeferredNotFired)))
def test_success(self):
# _spinner.extract_result returns the value of the Deferred if it has
# fired successfully.
marker = object()
d = defer.succeed(marker)
self.assertThat(extract_result(d), Equals(marker))
def test_failure(self):
# _spinner.extract_result raises the failure's exception if it's given
# a Deferred that is failing.
try:
1/0
except ZeroDivisionError:
f = Failure()
d = defer.fail(f)
self.assertThat(
lambda: extract_result(d),
Raises(MatchesException(ZeroDivisionError)))
def test_suite():
from unittest import TestLoader, TestSuite
return TestLoader().loadTestsFromName(__name__)
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