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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+=========================
+ Mock Library Comparison
+=========================
+
+
+.. testsetup::
+
+ def assertEqual(a, b):
+ assert a == b, ("%r != %r" % (a, b))
+
+ def assertRaises(Exc, func):
+ try:
+ func()
+ except Exc:
+ return
+ assert False, ("%s not raised" % Exc)
+
+ sys.modules['somemodule'] = somemodule = mock.Mock(name='somemodule')
+ class SomeException(Exception):
+ some_method = method1 = method2 = None
+ some_other_object = SomeObject = SomeException
+
+
+A side-by-side comparison of how to accomplish some basic tasks with mock and
+some other popular Python mocking libraries and frameworks.
+
+These are:
+
+* `flexmock <http://pypi.python.org/pypi/flexmock>`_
+* `mox <http://pypi.python.org/pypi/mox>`_
+* `Mocker <http://niemeyer.net/mocker>`_
+* `dingus <http://pypi.python.org/pypi/dingus>`_
+* `fudge <http://pypi.python.org/pypi/fudge>`_
+
+Popular python mocking frameworks not yet represented here include
+`MiniMock <http://pypi.python.org/pypi/MiniMock>`_.
+
+`pMock <http://pmock.sourceforge.net/>`_ (last release 2004 and doesn't import
+in recent versions of Python) and
+`python-mock <http://python-mock.sourceforge.net/>`_ (last release 2005) are
+intentionally omitted.
+
+.. note::
+
+ A more up to date, and tested for all mock libraries (only the mock
+ examples on this page can be executed as doctests) version of this
+ comparison is maintained by Gary Bernhardt:
+
+ * `Python Mock Library Comparison
+ <http://garybernhardt.github.com/python-mock-comparison/>`_
+
+This comparison is by no means complete, and also may not be fully idiomatic
+for all the libraries represented. *Please* contribute corrections, missing
+comparisons, or comparisons for additional libraries to the `mock issue
+tracker <https://code.google.com/p/mock/issues/list>`_.
+
+This comparison page was originally created by the `Mox project
+<https://code.google.com/p/pymox/wiki/MoxComparison>`_ and then extended for
+`flexmock and mock <http://has207.github.com/flexmock/compare.html>`_ by
+Herman Sheremetyev. Dingus examples written by `Gary Bernhadt
+<http://garybernhardt.github.com/python-mock-comparison/>`_. fudge examples
+provided by `Kumar McMillan <http://farmdev.com/>`_.
+
+.. note::
+
+ The examples tasks here were originally created by Mox which is a mocking
+ *framework* rather than a library like mock. The tasks shown naturally
+ exemplify tasks that frameworks are good at and not the ones they make
+ harder. In particular you can take a `Mock` or `MagicMock` object and use
+ it in any way you want with no up-front configuration. The same is also
+ true for Dingus.
+
+ The examples for mock here assume version 0.7.0.
+
+
+Simple fake object
+~~~~~~~~~~~~~~~~~~
+
+.. doctest::
+
+ >>> # mock
+ >>> my_mock = mock.Mock()
+ >>> my_mock.some_method.return_value = "calculated value"
+ >>> my_mock.some_attribute = "value"
+ >>> assertEqual("calculated value", my_mock.some_method())
+ >>> assertEqual("value", my_mock.some_attribute)
+
+::
+
+ # Flexmock
+ mock = flexmock(some_method=lambda: "calculated value", some_attribute="value")
+ assertEqual("calculated value", mock.some_method())
+ assertEqual("value", mock.some_attribute)
+
+ # Mox
+ mock = mox.MockAnything()
+ mock.some_method().AndReturn("calculated value")
+ mock.some_attribute = "value"
+ mox.Replay(mock)
+ assertEqual("calculated value", mock.some_method())
+ assertEqual("value", mock.some_attribute)
+
+ # Mocker
+ mock = mocker.mock()
+ mock.some_method()
+ mocker.result("calculated value")
+ mocker.replay()
+ mock.some_attribute = "value"
+ assertEqual("calculated value", mock.some_method())
+ assertEqual("value", mock.some_attribute)
+
+::
+
+ >>> # Dingus
+ >>> my_dingus = dingus.Dingus(some_attribute="value",
+ ... some_method__returns="calculated value")
+ >>> assertEqual("calculated value", my_dingus.some_method())
+ >>> assertEqual("value", my_dingus.some_attribute)
+
+::
+
+ >>> # fudge
+ >>> my_fake = (fudge.Fake()
+ ... .provides('some_method')
+ ... .returns("calculated value")
+ ... .has_attr(some_attribute="value"))
+ ...
+ >>> assertEqual("calculated value", my_fake.some_method())
+ >>> assertEqual("value", my_fake.some_attribute)
+
+
+Simple mock
+~~~~~~~~~~~
+
+.. doctest::
+
+ >>> # mock
+ >>> my_mock = mock.Mock()
+ >>> my_mock.some_method.return_value = "value"
+ >>> assertEqual("value", my_mock.some_method())
+ >>> my_mock.some_method.assert_called_once_with()
+
+::
+
+ # Flexmock
+ mock = flexmock()
+ mock.should_receive("some_method").and_return("value").once
+ assertEqual("value", mock.some_method())
+
+ # Mox
+ mock = mox.MockAnything()
+ mock.some_method().AndReturn("value")
+ mox.Replay(mock)
+ assertEqual("value", mock.some_method())
+ mox.Verify(mock)
+
+ # Mocker
+ mock = mocker.mock()
+ mock.some_method()
+ mocker.result("value")
+ mocker.replay()
+ assertEqual("value", mock.some_method())
+ mocker.verify()
+
+::
+
+ >>> # Dingus
+ >>> my_dingus = dingus.Dingus(some_method__returns="value")
+ >>> assertEqual("value", my_dingus.some_method())
+ >>> assert my_dingus.some_method.calls().once()
+
+::
+
+ >>> # fudge
+ >>> @fudge.test
+ ... def test():
+ ... my_fake = (fudge.Fake()
+ ... .expects('some_method')
+ ... .returns("value")
+ ... .times_called(1))
+ ...
+ >>> test()
+ Traceback (most recent call last):
+ ...
+ AssertionError: fake:my_fake.some_method() was not called
+
+
+Creating partial mocks
+~~~~~~~~~~~~~~~~~~~~~~
+
+.. doctest::
+
+ >>> # mock
+ >>> SomeObject.some_method = mock.Mock(return_value='value')
+ >>> assertEqual("value", SomeObject.some_method())
+
+::
+
+ # Flexmock
+ flexmock(SomeObject).should_receive("some_method").and_return('value')
+ assertEqual("value", mock.some_method())
+
+ # Mox
+ mock = mox.MockObject(SomeObject)
+ mock.some_method().AndReturn("value")
+ mox.Replay(mock)
+ assertEqual("value", mock.some_method())
+ mox.Verify(mock)
+
+ # Mocker
+ mock = mocker.mock(SomeObject)
+ mock.Get()
+ mocker.result("value")
+ mocker.replay()
+ assertEqual("value", mock.some_method())
+ mocker.verify()
+
+::
+
+ >>> # Dingus
+ >>> object = SomeObject
+ >>> object.some_method = dingus.Dingus(return_value="value")
+ >>> assertEqual("value", object.some_method())
+
+::
+
+ >>> # fudge
+ >>> fake = fudge.Fake().is_callable().returns("<fudge-value>")
+ >>> with fudge.patched_context(SomeObject, 'some_method', fake):
+ ... s = SomeObject()
+ ... assertEqual("<fudge-value>", s.some_method())
+ ...
+
+
+Ensure calls are made in specific order
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. doctest::
+
+ >>> # mock
+ >>> my_mock = mock.Mock(spec=SomeObject)
+ >>> my_mock.method1()
+ <Mock name='mock.method1()' id='...'>
+ >>> my_mock.method2()
+ <Mock name='mock.method2()' id='...'>
+ >>> assertEqual(my_mock.mock_calls, [call.method1(), call.method2()])
+
+::
+
+ # Flexmock
+ mock = flexmock(SomeObject)
+ mock.should_receive('method1').once.ordered.and_return('first thing')
+ mock.should_receive('method2').once.ordered.and_return('second thing')
+
+ # Mox
+ mock = mox.MockObject(SomeObject)
+ mock.method1().AndReturn('first thing')
+ mock.method2().AndReturn('second thing')
+ mox.Replay(mock)
+ mox.Verify(mock)
+
+ # Mocker
+ mock = mocker.mock()
+ with mocker.order():
+ mock.method1()
+ mocker.result('first thing')
+ mock.method2()
+ mocker.result('second thing')
+ mocker.replay()
+ mocker.verify()
+
+::
+
+ >>> # Dingus
+ >>> my_dingus = dingus.Dingus()
+ >>> my_dingus.method1()
+ <Dingus ...>
+ >>> my_dingus.method2()
+ <Dingus ...>
+ >>> assertEqual(['method1', 'method2'], [call.name for call in my_dingus.calls])
+
+::
+
+ >>> # fudge
+ >>> @fudge.test
+ ... def test():
+ ... my_fake = (fudge.Fake()
+ ... .remember_order()
+ ... .expects('method1')
+ ... .expects('method2'))
+ ... my_fake.method2()
+ ... my_fake.method1()
+ ...
+ >>> test()
+ Traceback (most recent call last):
+ ...
+ AssertionError: Call #1 was fake:my_fake.method2(); Expected: #1 fake:my_fake.method1(), #2 fake:my_fake.method2(), end
+
+
+Raising exceptions
+~~~~~~~~~~~~~~~~~~
+
+.. doctest::
+
+ >>> # mock
+ >>> my_mock = mock.Mock()
+ >>> my_mock.some_method.side_effect = SomeException("message")
+ >>> assertRaises(SomeException, my_mock.some_method)
+
+::
+
+ # Flexmock
+ mock = flexmock()
+ mock.should_receive("some_method").and_raise(SomeException("message"))
+ assertRaises(SomeException, mock.some_method)
+
+ # Mox
+ mock = mox.MockAnything()
+ mock.some_method().AndRaise(SomeException("message"))
+ mox.Replay(mock)
+ assertRaises(SomeException, mock.some_method)
+ mox.Verify(mock)
+
+ # Mocker
+ mock = mocker.mock()
+ mock.some_method()
+ mocker.throw(SomeException("message"))
+ mocker.replay()
+ assertRaises(SomeException, mock.some_method)
+ mocker.verify()
+
+::
+
+ >>> # Dingus
+ >>> my_dingus = dingus.Dingus()
+ >>> my_dingus.some_method = dingus.exception_raiser(SomeException)
+ >>> assertRaises(SomeException, my_dingus.some_method)
+
+::
+
+ >>> # fudge
+ >>> my_fake = (fudge.Fake()
+ ... .is_callable()
+ ... .raises(SomeException("message")))
+ ...
+ >>> my_fake()
+ Traceback (most recent call last):
+ ...
+ SomeException: message
+
+
+Override new instances of a class
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. doctest::
+
+ >>> # mock
+ >>> with mock.patch('somemodule.Someclass') as MockClass:
+ ... MockClass.return_value = some_other_object
+ ... assertEqual(some_other_object, somemodule.Someclass())
+ ...
+
+
+::
+
+ # Flexmock
+ flexmock(some_module.SomeClass, new_instances=some_other_object)
+ assertEqual(some_other_object, some_module.SomeClass())
+
+ # Mox
+ # (you will probably have mox.Mox() available as self.mox in a real test)
+ mox.Mox().StubOutWithMock(some_module, 'SomeClass', use_mock_anything=True)
+ some_module.SomeClass().AndReturn(some_other_object)
+ mox.ReplayAll()
+ assertEqual(some_other_object, some_module.SomeClass())
+
+ # Mocker
+ instance = mocker.mock()
+ klass = mocker.replace(SomeClass, spec=None)
+ klass('expected', 'args')
+ mocker.result(instance)
+
+::
+
+ >>> # Dingus
+ >>> MockClass = dingus.Dingus(return_value=some_other_object)
+ >>> with dingus.patch('somemodule.SomeClass', MockClass):
+ ... assertEqual(some_other_object, somemodule.SomeClass())
+ ...
+
+::
+
+ >>> # fudge
+ >>> @fudge.patch('somemodule.SomeClass')
+ ... def test(FakeClass):
+ ... FakeClass.is_callable().returns(some_other_object)
+ ... assertEqual(some_other_object, somemodule.SomeClass())
+ ...
+ >>> test()
+
+
+Call the same method multiple times
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. note::
+
+ You don't need to do *any* configuration to call `mock.Mock()` methods
+ multiple times. Attributes like `call_count`, `call_args_list` and
+ `method_calls` provide various different ways of making assertions about
+ how the mock was used.
+
+.. doctest::
+
+ >>> # mock
+ >>> my_mock = mock.Mock()
+ >>> my_mock.some_method()
+ <Mock name='mock.some_method()' id='...'>
+ >>> my_mock.some_method()
+ <Mock name='mock.some_method()' id='...'>
+ >>> assert my_mock.some_method.call_count >= 2
+
+::
+
+ # Flexmock # (verifies that the method gets called at least twice)
+ flexmock(some_object).should_receive('some_method').at_least.twice
+
+ # Mox
+ # (does not support variable number of calls, so you need to create a new entry for each explicit call)
+ mock = mox.MockObject(some_object)
+ mock.some_method(mox.IgnoreArg(), mox.IgnoreArg())
+ mock.some_method(mox.IgnoreArg(), mox.IgnoreArg())
+ mox.Replay(mock)
+ mox.Verify(mock)
+
+ # Mocker
+ # (TODO)
+
+::
+
+ >>> # Dingus
+ >>> my_dingus = dingus.Dingus()
+ >>> my_dingus.some_method()
+ <Dingus ...>
+ >>> my_dingus.some_method()
+ <Dingus ...>
+ >>> assert len(my_dingus.calls('some_method')) == 2
+
+::
+
+ >>> # fudge
+ >>> @fudge.test
+ ... def test():
+ ... my_fake = fudge.Fake().expects('some_method').times_called(2)
+ ... my_fake.some_method()
+ ...
+ >>> test()
+ Traceback (most recent call last):
+ ...
+ AssertionError: fake:my_fake.some_method() was called 1 time(s). Expected 2.
+
+
+Mock chained methods
+~~~~~~~~~~~~~~~~~~~~
+
+.. doctest::
+
+ >>> # mock
+ >>> my_mock = mock.Mock()
+ >>> method3 = my_mock.method1.return_value.method2.return_value.method3
+ >>> method3.return_value = 'some value'
+ >>> assertEqual('some value', my_mock.method1().method2().method3(1, 2))
+ >>> method3.assert_called_once_with(1, 2)
+
+::
+
+ # Flexmock
+ # (intermediate method calls are automatically assigned to temporary fake objects
+ # and can be called with any arguments)
+ flexmock(some_object).should_receive(
+ 'method1.method2.method3'
+ ).with_args(arg1, arg2).and_return('some value')
+ assertEqual('some_value', some_object.method1().method2().method3(arg1, arg2))
+
+::
+
+ # Mox
+ mock = mox.MockObject(some_object)
+ mock2 = mox.MockAnything()
+ mock3 = mox.MockAnything()
+ mock.method1().AndReturn(mock1)
+ mock2.method2().AndReturn(mock2)
+ mock3.method3(arg1, arg2).AndReturn('some_value')
+ self.mox.ReplayAll()
+ assertEqual("some_value", some_object.method1().method2().method3(arg1, arg2))
+ self.mox.VerifyAll()
+
+ # Mocker
+ # (TODO)
+
+::
+
+ >>> # Dingus
+ >>> my_dingus = dingus.Dingus()
+ >>> method3 = my_dingus.method1.return_value.method2.return_value.method3
+ >>> method3.return_value = 'some value'
+ >>> assertEqual('some value', my_dingus.method1().method2().method3(1, 2))
+ >>> assert method3.calls('()', 1, 2).once()
+
+::
+
+ >>> # fudge
+ >>> @fudge.test
+ ... def test():
+ ... my_fake = fudge.Fake()
+ ... (my_fake
+ ... .expects('method1')
+ ... .returns_fake()
+ ... .expects('method2')
+ ... .returns_fake()
+ ... .expects('method3')
+ ... .with_args(1, 2)
+ ... .returns('some value'))
+ ... assertEqual('some value', my_fake.method1().method2().method3(1, 2))
+ ...
+ >>> test()
+
+
+Mocking a context manager
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Examples for mock, Dingus and fudge only (so far):
+
+.. doctest::
+
+ >>> # mock
+ >>> my_mock = mock.MagicMock()
+ >>> with my_mock:
+ ... pass
+ ...
+ >>> my_mock.__enter__.assert_called_with()
+ >>> my_mock.__exit__.assert_called_with(None, None, None)
+
+::
+
+
+ >>> # Dingus (nothing special here; all dinguses are "magic mocks")
+ >>> my_dingus = dingus.Dingus()
+ >>> with my_dingus:
+ ... pass
+ ...
+ >>> assert my_dingus.__enter__.calls()
+ >>> assert my_dingus.__exit__.calls('()', None, None, None)
+
+::
+
+ >>> # fudge
+ >>> my_fake = fudge.Fake().provides('__enter__').provides('__exit__')
+ >>> with my_fake:
+ ... pass
+ ...
+
+
+Mocking the builtin open used as a context manager
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Example for mock only (so far):
+
+.. doctest::
+
+ >>> # mock
+ >>> my_mock = mock.MagicMock()
+ >>> with mock.patch('__builtin__.open', my_mock):
+ ... manager = my_mock.return_value.__enter__.return_value
+ ... manager.read.return_value = 'some data'
+ ... with open('foo') as h:
+ ... data = h.read()
+ ...
+ >>> data
+ 'some data'
+ >>> my_mock.assert_called_once_with('foo')
+
+*or*:
+
+.. doctest::
+
+ >>> # mock
+ >>> with mock.patch('__builtin__.open') as my_mock:
+ ... my_mock.return_value.__enter__ = lambda s: s
+ ... my_mock.return_value.__exit__ = mock.Mock()
+ ... my_mock.return_value.read.return_value = 'some data'
+ ... with open('foo') as h:
+ ... data = h.read()
+ ...
+ >>> data
+ 'some data'
+ >>> my_mock.assert_called_once_with('foo')
+
+::
+
+ >>> # Dingus
+ >>> my_dingus = dingus.Dingus()
+ >>> with dingus.patch('__builtin__.open', my_dingus):
+ ... file_ = open.return_value.__enter__.return_value
+ ... file_.read.return_value = 'some data'
+ ... with open('foo') as h:
+ ... data = f.read()
+ ...
+ >>> data
+ 'some data'
+ >>> assert my_dingus.calls('()', 'foo').once()
+
+::
+
+ >>> # fudge
+ >>> from contextlib import contextmanager
+ >>> from StringIO import StringIO
+ >>> @contextmanager
+ ... def fake_file(filename):
+ ... yield StringIO('sekrets')
+ ...
+ >>> with fudge.patch('__builtin__.open') as fake_open:
+ ... fake_open.is_callable().calls(fake_file)
+ ... with open('/etc/password') as f:
+ ... data = f.read()
+ ...
+ fake:__builtin__.open
+ >>> data
+ 'sekrets' \ No newline at end of file