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fakeable_test.py
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fakeable_test.py
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# -*- coding: utf-8 -*-
# Copyright 2013 Denver Coneybeare
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function
from __future__ import unicode_literals
import fakeable
import unittest
import six
class MyCoolClass(six.with_metaclass(fakeable.Fakeable)):
def __init__(self, arg1=None, arg2=None):
self.arg1 = arg1
self.arg2 = arg2
class MyUnfakeableClass(object):
def __init__(self, arg1=None, arg2=None):
self.arg1 = arg1
self.arg2 = arg2
class MyUnfakeableClass1(object):
def __init__(self, arg1=None, arg2=None):
self.arg1 = arg1
self.arg2 = arg2
class MyUnfakeableClass2(object):
def __init__(self, arg1=None, arg2=None):
self.arg1 = arg1
self.arg2 = arg2
class MyCoolClassCustomFakeName(six.with_metaclass(fakeable.Fakeable)):
__FAKE_NAME__ = "CustomName"
def __init__(self, arg1=None, arg2=None):
self.arg1 = arg1
self.arg2 = arg2
class FakeCreatedCallbackTester(object):
"""
An object that can be specified to add_created_callback() to
test that the expected invocations do (or do not) occur.
"""
NEXT_INDEX = 0
def __init__(self, test):
self.test = test
self.invocations = []
def __call__(self, name, obj, obj_type):
index = type(self).NEXT_INDEX
type(self).NEXT_INDEX += 1
invocation = self.Invocation(index, name, obj, obj_type)
self.invocations.append(invocation)
def assert_invoked_exactly_once(self):
num_invocations = len(self.invocations)
if num_invocations == 0:
self.test.fail(
"callback was not invoked, but expected exactly 1 invocation")
elif num_invocations > 1:
self.test.fail(
"callback was not invoked {} times, but expected exactly "
"1 invocation".format(num_invocations))
invocation = self.invocations[0]
return invocation
def assert_invocation_count(self, expected_count):
num_invocations = len(self.invocations)
if num_invocations != expected_count:
self.test.fail(
"callback was not invoked {} times, but expected exactly {} "
"invocations".format(num_invocations, expected_count))
return self.invocations[:expected_count]
class Invocation(object):
def __init__(self, index, name, obj, obj_type):
self.index = index
self.name = name
self.obj = obj
self.obj_type = obj_type
class Test_Fakeable___new__(fakeable.FakeableCleanupMixin, unittest.TestCase):
def test_DefaultFakeName(self):
self.assertEqual(MyCoolClass.__FAKE_NAME__, "MyCoolClass")
def test_CustomFakeName(self):
self.assertEqual(MyCoolClassCustomFakeName.__FAKE_NAME__, "CustomName")
def test_CustomFakeNameNotHashable(self):
with self.assertRaises(TypeError):
class NameNotHashable(six.with_metaclass(fakeable.Fakeable)):
__FAKE_NAME__ = set()
class Test_Fakeable___call__(fakeable.FakeableCleanupMixin, unittest.TestCase):
def test_NoFakeRegistered(self):
x = MyCoolClass()
self.assertIsInstance(x, MyCoolClass)
def test_NoFakeRegistered_PositionalArgs(self):
x = MyCoolClass(1, 2)
self.assertEqual(x.arg1, 1)
self.assertEqual(x.arg2, 2)
def test_NoFakeRegistered_KeywordArgs(self):
x = MyCoolClass(arg1=1, arg2=2)
self.assertEqual(x.arg1, 1)
self.assertEqual(x.arg2, 2)
def test_FakeObjectRegisteredByName(self):
fake_object = object()
fakeable.set_fake_object("MyCoolClass", fake_object)
x = MyCoolClass()
self.assertIs(x, fake_object)
def test_FakeObjectRegisteredByName_PositionalArgs(self):
fake_object = object()
fakeable.set_fake_object("MyCoolClass", fake_object)
x = MyCoolClass(1, 2)
self.assertIs(x, fake_object)
def test_FakeObjectRegisteredByName_KeywordArgs(self):
fake_object = object()
fakeable.set_fake_object("MyCoolClass", fake_object)
x = MyCoolClass(arg1=1, arg2=2)
self.assertIs(x, fake_object)
def test_FakeObjectRegisteredByClass(self):
fake_object = object()
fakeable.set_fake_object(MyCoolClass, fake_object)
x = MyCoolClass()
self.assertIs(x, fake_object)
def test_FakeObjectRegisteredByClass_PositionalArgs(self):
fake_object = object()
fakeable.set_fake_object(MyCoolClass, fake_object)
x = MyCoolClass(1, 2)
self.assertIs(x, fake_object)
def test_FakeObjectRegisteredByClass_KeywordArgs(self):
fake_object = object()
fakeable.set_fake_object(MyCoolClass, fake_object)
x = MyCoolClass(arg1=1, arg2=2)
self.assertIs(x, fake_object)
def test_FakeObjectRegisteredByCustomName(self):
fake_object = object()
fakeable.set_fake_object("CustomName", fake_object)
x = MyCoolClassCustomFakeName()
self.assertIs(x, fake_object)
def test_FakeObjectRegisteredByCustomName_PositionalArgs(self):
fake_object = object()
fakeable.set_fake_object("CustomName", fake_object)
x = MyCoolClassCustomFakeName(1, 2)
self.assertIs(x, fake_object)
def test_FakeObjectRegisteredByCustomName_KeywordArgs(self):
fake_object = object()
fakeable.set_fake_object("CustomName", fake_object)
x = MyCoolClassCustomFakeName(arg1=1, arg2=2)
self.assertIs(x, fake_object)
def test_2FakeObjectsRegisteredByName_OtherNameRegisteredAfter(self):
fake_object1 = object()
fake_object2 = object()
fakeable.set_fake_object("MyCoolClass", fake_object1)
fakeable.set_fake_object("SomeOtherClass", fake_object2)
x = MyCoolClass()
self.assertIs(x, fake_object1)
def test_2FakeObjectsRegisteredByName_OtherNameRegisteredBefore(self):
fake_object1 = object()
fake_object2 = object()
fakeable.set_fake_object("SomeOtherClass", fake_object1)
fakeable.set_fake_object("MyCoolClass", fake_object2)
x = MyCoolClass()
self.assertIs(x, fake_object2)
def test_FakeObjectRegisteredTwiceByName(self):
fake_object1 = object()
fake_object2 = object()
fakeable.set_fake_object("MyCoolClass", fake_object1)
fakeable.set_fake_object("MyCoolClass", fake_object2)
x = MyCoolClass()
self.assertIs(x, fake_object2)
def test_FakeObjectRegisteredByNameAndClass_NameRegisteredFirst(self):
fake_object1 = object()
fake_object2 = object()
fakeable.set_fake_object("MyCoolClass", fake_object1)
fakeable.set_fake_object(MyCoolClass, fake_object2)
x = MyCoolClass()
self.assertIs(x, fake_object2)
def test_FakeObjectRegisteredByNameAndClass_NameRegisteredAfter(self):
fake_object1 = object()
fake_object2 = object()
fakeable.set_fake_object(MyCoolClass, fake_object1)
fakeable.set_fake_object("MyCoolClass", fake_object2)
x = MyCoolClass()
self.assertIs(x, fake_object1)
def test_FakeClassRegisteredByName(self):
fakeable.set_fake_class("MyCoolClass", MyUnfakeableClass)
x = MyCoolClass()
self.assertIsInstance(x, MyUnfakeableClass)
def test_FakeClassRegisteredByName_PositionalArgs(self):
fakeable.set_fake_class("MyCoolClass", MyUnfakeableClass)
x = MyCoolClass(1, 2)
self.assertIsInstance(x, MyUnfakeableClass)
self.assertEqual(x.arg1, 1)
self.assertEqual(x.arg2, 2)
def test_FakeClassRegisteredByName_KeywordArgs(self):
fakeable.set_fake_class("MyCoolClass", MyUnfakeableClass)
x = MyCoolClass(arg1=1, arg2=2)
self.assertIsInstance(x, MyUnfakeableClass)
self.assertEqual(x.arg1, 1)
self.assertEqual(x.arg2, 2)
def test_FakeClassRegisteredByClass(self):
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass)
x = MyCoolClass()
self.assertIsInstance(x, MyUnfakeableClass)
def test_FakeClassRegisteredByClass_PositionalArgs(self):
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass)
x = MyCoolClass(1, 2)
self.assertIsInstance(x, MyUnfakeableClass)
self.assertEqual(x.arg1, 1)
self.assertEqual(x.arg2, 2)
def test_FakeClassRegisteredByClass_KeywordArgs(self):
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass)
x = MyCoolClass(arg1=1, arg2=2)
self.assertIsInstance(x, MyUnfakeableClass)
self.assertEqual(x.arg1, 1)
self.assertEqual(x.arg2, 2)
def test_2FakeClassesRegisteredByClass_OtherClassRegisteredAfter(self):
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass1)
fakeable.set_fake_class(MyCoolClassCustomFakeName, MyUnfakeableClass2)
x = MyCoolClass()
self.assertIsInstance(x, MyUnfakeableClass1)
def test_2FakeClassesRegisteredByClass_OtherClassRegisteredBefore(self):
fakeable.set_fake_class(MyCoolClassCustomFakeName, MyUnfakeableClass1)
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass2)
x = MyCoolClass()
self.assertIsInstance(x, MyUnfakeableClass2)
def test_FakeClassRegisteredTwiceByClass(self):
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass1)
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass2)
x = MyCoolClass()
self.assertIsInstance(x, MyUnfakeableClass2)
def test_ClassRegisteredByNameAndClass_NameRegisteredFirst(self):
fakeable.set_fake_class("MyCoolClass", MyUnfakeableClass1)
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass2)
x = MyCoolClass()
self.assertIsInstance(x, MyUnfakeableClass2)
def test_ClassRegisteredByNameAndClass_NameRegisteredAfter(self):
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass1)
fakeable.set_fake_class("MyCoolClass", MyUnfakeableClass2)
x = MyCoolClass()
self.assertIsInstance(x, MyUnfakeableClass1)
class Test_FakeableCleanupMixin(unittest.TestCase):
def test_setUp_SuperclassSetUpSuccessful(self):
fakeable.set_fake_object("MyCoolClass", object())
x = self.TestableFakeableCleanupMixin()
x.setUp()
obj = MyCoolClass()
self.assertIsInstance(
obj, MyCoolClass, "setUp() should have cleared all of the "
"registered fakes")
self.assertTrue(x.setUp_invoked)
def test_setUp_SuperclassSetUpRaisesException(self):
fake_my_cool_class_instance = object()
fakeable.set_fake_object("MyCoolClass", fake_my_cool_class_instance)
x = self.TestableFakeableCleanupMixin(setUp_exception=ValueError())
with self.assertRaises(ValueError):
x.setUp()
obj = MyCoolClass()
self.assertIs(
obj, fake_my_cool_class_instance, "setUp() should *not* have "
"cleared all of the registered fakes")
self.assertTrue(x.setUp_invoked)
def test_tearDown_SuperclassSetUpSuccessful(self):
fakeable.set_fake_object("MyCoolClass", object())
x = self.TestableFakeableCleanupMixin()
x.tearDown()
obj = MyCoolClass()
self.assertIsInstance(
obj, MyCoolClass, "tearDown() should have cleared all of the "
"registered fakes")
self.assertTrue(x.tearDown_invoked)
def test_tearDown_SuperclassSetUpRaisesException(self):
fakeable.set_fake_object("MyCoolClass", object())
x = self.TestableFakeableCleanupMixin(tearDown_exception=ValueError())
with self.assertRaises(ValueError):
x.tearDown()
obj = MyCoolClass()
self.assertIsInstance(
obj, MyCoolClass, "tearDown() should have cleared all of the "
"registered fakes")
self.assertTrue(x.tearDown_invoked)
class DemoBaseClass(object):
def __init__(self, setUp_exception=None, tearDown_exception=None):
self.setUp_exception = setUp_exception
self.tearDown_exception = tearDown_exception
self.setUp_invoked = False
self.tearDown_invoked = False
def setUp(self):
self.setUp_invoked = True
if self.setUp_exception is not None:
raise self.setUp_exception
def tearDown(self):
self.tearDown_invoked = True
if self.tearDown_exception is not None:
raise self.tearDown_exception
class TestableFakeableCleanupMixin(
fakeable.FakeableCleanupMixin, DemoBaseClass):
pass
class Test_add_created_callback(
fakeable.FakeableCleanupMixin, unittest.TestCase):
def test_NoFakeRegistered_DefaultFakeName(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
MyCoolClass()
invocation = callback.assert_invoked_exactly_once()
self.assertEqual(invocation.name, "MyCoolClass")
self.assertIsInstance(invocation.obj, MyCoolClass)
self.assertIs(invocation.obj_type, MyCoolClass)
def test_NoFakeRegistered_CustomFakeName(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
MyCoolClassCustomFakeName()
invocation = callback.assert_invoked_exactly_once()
self.assertEqual(invocation.name, "CustomName")
self.assertIsInstance(invocation.obj, MyCoolClassCustomFakeName)
self.assertIs(invocation.obj_type, MyCoolClassCustomFakeName)
def test_2FakeableInstancesCreated(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
MyCoolClass()
MyCoolClass()
invocations = callback.assert_invocation_count(2)
self.assertEqual(invocations[0].name, "MyCoolClass")
self.assertIsInstance(invocations[0].obj, MyCoolClass)
self.assertIs(invocations[0].obj_type, MyCoolClass)
self.assertEqual(invocations[1].name, "MyCoolClass")
self.assertIsInstance(invocations[1].obj, MyCoolClass)
self.assertIs(invocations[1].obj_type, MyCoolClass)
def test_2CallbacksRegistered(self):
callback1 = FakeCreatedCallbackTester(self)
callback2 = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback1)
fakeable.add_created_callback(callback2)
MyCoolClass()
invocation1 = callback1.assert_invoked_exactly_once()
self.assertEqual(invocation1.name, "MyCoolClass")
self.assertIsInstance(invocation1.obj, MyCoolClass)
self.assertIs(invocation1.obj_type, MyCoolClass)
invocation2 = callback2.assert_invoked_exactly_once()
self.assertIs(invocation2.name, invocation1.name)
self.assertIs(invocation2.obj, invocation1.obj)
self.assertIs(invocation2.obj_type, invocation1.obj_type)
def test_2CallbacksRegistered_InvokedInCorrectOrder(self):
callback1 = FakeCreatedCallbackTester(self)
callback2 = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback1)
fakeable.add_created_callback(callback2)
MyCoolClass()
invocation1 = callback1.assert_invoked_exactly_once()
invocation2 = callback2.assert_invoked_exactly_once()
self.assertLess(invocation1.index, invocation2.index)
def test_CallbackRegisteredTwice(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fakeable.add_created_callback(callback)
MyCoolClass()
invocations = callback.assert_invocation_count(2)
self.assertEqual(invocations[0].name, "MyCoolClass")
self.assertIsInstance(invocations[0].obj, MyCoolClass)
self.assertIs(invocations[0].obj_type, MyCoolClass)
self.assertEqual(invocations[1].name, "MyCoolClass")
self.assertIsInstance(invocations[1].obj, MyCoolClass)
self.assertIs(invocations[1].obj_type, MyCoolClass)
def test_FakeObjectRegisteredByName(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fake_object = object()
fakeable.set_fake_object("MyCoolClass", fake_object)
MyCoolClass()
invocation = callback.assert_invoked_exactly_once()
self.assertEqual(invocation.name, "MyCoolClass")
self.assertIs(invocation.obj, fake_object)
self.assertIs(invocation.obj_type, MyCoolClass)
def test_FakeObjectRegisteredByName_2InstancesCreated(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fake_object = object()
fakeable.set_fake_object("MyCoolClass", fake_object)
MyCoolClass()
MyCoolClass()
invocations = callback.assert_invocation_count(2)
self.assertEqual(invocations[0].name, "MyCoolClass")
self.assertIs(invocations[0].obj, fake_object)
self.assertIs(invocations[0].obj_type, MyCoolClass)
self.assertEqual(invocations[1].name, "MyCoolClass")
self.assertIs(invocations[1].obj, fake_object)
self.assertIs(invocations[1].obj_type, MyCoolClass)
def test_FakeObjectRegisteredByClass(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fake_object = object()
fakeable.set_fake_object(MyCoolClass, fake_object)
MyCoolClass()
invocation = callback.assert_invoked_exactly_once()
self.assertEqual(invocation.name, "MyCoolClass")
self.assertIs(invocation.obj, fake_object)
self.assertIs(invocation.obj_type, MyCoolClass)
def test_FakeObjectRegisteredByClass_2InstancesCreated(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fake_object = object()
fakeable.set_fake_object(MyCoolClass, fake_object)
MyCoolClass()
MyCoolClass()
invocations = callback.assert_invocation_count(2)
self.assertEqual(invocations[0].name, "MyCoolClass")
self.assertIs(invocations[0].obj, fake_object)
self.assertIs(invocations[0].obj_type, MyCoolClass)
self.assertEqual(invocations[1].name, "MyCoolClass")
self.assertIs(invocations[1].obj, fake_object)
self.assertIs(invocations[1].obj_type, MyCoolClass)
def test_FakeClassRegisteredByName(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fakeable.set_fake_class("MyCoolClass", MyUnfakeableClass)
MyCoolClass()
invocation = callback.assert_invoked_exactly_once()
self.assertEqual(invocation.name, "MyCoolClass")
self.assertIsInstance(invocation.obj, MyUnfakeableClass)
self.assertIs(invocation.obj_type, MyCoolClass)
def test_FakeClassRegisteredByName_2InstancesCreated(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fakeable.set_fake_class("MyCoolClass", MyUnfakeableClass)
MyCoolClass()
MyCoolClass()
invocations = callback.assert_invocation_count(2)
self.assertEqual(invocations[0].name, "MyCoolClass")
self.assertIsInstance(invocations[0].obj, MyUnfakeableClass)
self.assertIs(invocations[0].obj_type, MyCoolClass)
self.assertEqual(invocations[1].name, "MyCoolClass")
self.assertIsInstance(invocations[1].obj, MyUnfakeableClass)
self.assertIs(invocations[1].obj_type, MyCoolClass)
self.assertIsNot(invocations[0].obj, invocations[1].obj)
def test_FakeClassRegisteredByClass(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass)
MyCoolClass()
invocation = callback.assert_invoked_exactly_once()
self.assertEqual(invocation.name, "MyCoolClass")
self.assertIsInstance(invocation.obj, MyUnfakeableClass)
self.assertIs(invocation.obj_type, MyCoolClass)
def test_FakeClassRegisteredByClass_2InstancesCreated(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fakeable.set_fake_class(MyCoolClass, MyUnfakeableClass)
MyCoolClass()
MyCoolClass()
invocations = callback.assert_invocation_count(2)
self.assertEqual(invocations[0].name, "MyCoolClass")
self.assertIsInstance(invocations[0].obj, MyUnfakeableClass)
self.assertIs(invocations[0].obj_type, MyCoolClass)
self.assertEqual(invocations[1].name, "MyCoolClass")
self.assertIsInstance(invocations[1].obj, MyUnfakeableClass)
self.assertIs(invocations[1].obj_type, MyCoolClass)
class Test_remove_created_callback(
fakeable.FakeableCleanupMixin, unittest.TestCase):
def test_0CallbacksAdded_RemoveNeverAddedCallback(self):
callback = FakeCreatedCallbackTester(self)
retval = fakeable.remove_created_callback(callback)
self.assertIs(retval, False)
fakeable.add_created_callback(callback)
MyCoolClass()
callback.assert_invoked_exactly_once()
def test_1CallbacksAdded_RemoveNeverAddedCallback(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
retval = fakeable.remove_created_callback(object())
self.assertIs(retval, False)
MyCoolClass()
callback.assert_invoked_exactly_once()
def test_1CallbacksAdded_RemoveTheAddedCallback(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
retval = fakeable.remove_created_callback(callback)
self.assertIs(retval, True)
MyCoolClass()
callback.assert_invocation_count(0)
def test_2CallbacksAdded_RemoveNeverAddedCallback(self):
callback1 = FakeCreatedCallbackTester(self)
callback2 = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback1)
fakeable.add_created_callback(callback2)
retval = fakeable.remove_created_callback(object())
self.assertIs(retval, False)
MyCoolClass()
callback1.assert_invoked_exactly_once()
callback2.assert_invoked_exactly_once()
def test_2CallbacksAdded_Remove1stAddedCallback(self):
callback1 = FakeCreatedCallbackTester(self)
callback2 = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback1)
fakeable.add_created_callback(callback2)
retval = fakeable.remove_created_callback(callback1)
self.assertIs(retval, True)
MyCoolClass()
callback1.assert_invocation_count(0)
callback2.assert_invoked_exactly_once()
def test_2CallbacksAdded_Remove2ndAddedCallback(self):
callback1 = FakeCreatedCallbackTester(self)
callback2 = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback1)
fakeable.add_created_callback(callback2)
retval = fakeable.remove_created_callback(callback2)
self.assertIs(retval, True)
MyCoolClass()
callback1.assert_invoked_exactly_once()
callback2.assert_invocation_count(0)
def test_2CallbacksAdded_RemoveBothAddedCallbacks(self):
callback1 = FakeCreatedCallbackTester(self)
callback2 = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback1)
fakeable.add_created_callback(callback2)
retval1 = fakeable.remove_created_callback(callback1)
self.assertIs(retval1, True)
retval2 = fakeable.remove_created_callback(callback2)
self.assertIs(retval2, True)
MyCoolClass()
callback1.assert_invocation_count(0)
callback2.assert_invocation_count(0)
def test_1CallbacksAdded2Times_RemoveTheAddedCallback1Time(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fakeable.add_created_callback(callback)
retval = fakeable.remove_created_callback(callback)
self.assertIs(retval, True)
MyCoolClass()
callback.assert_invoked_exactly_once()
def test_1CallbacksAdded2Times_RemoveTheAddedCallback2Times(self):
callback = FakeCreatedCallbackTester(self)
fakeable.add_created_callback(callback)
fakeable.add_created_callback(callback)
retval1 = fakeable.remove_created_callback(callback)
self.assertIs(retval1, True)
retval2 = fakeable.remove_created_callback(callback)
self.assertIs(retval2, True)
MyCoolClass()
callback.assert_invocation_count(0)
if __name__ == "__main__":
unittest.main()