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Added: incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/magicmock.txt
URL: http://svn.apache.org/viewvc/incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/magicmock.txt?rev=1442010&view=auto
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--- incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/magicmock.txt (added)
+++ incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/magicmock.txt Mon Feb 4 02:23:55 2013
@@ -0,0 +1,258 @@
+
+.. currentmodule:: mock
+
+
+.. _magic-methods:
+
+Mocking Magic Methods
+=====================
+
+.. currentmodule:: mock
+
+:class:`Mock` supports mocking `magic methods
+<http://www.ironpythoninaction.com/magic-methods.html>`_. This allows mock
+objects to replace containers or other objects that implement Python
+protocols.
+
+Because magic methods are looked up differently from normal methods [#]_, this
+support has been specially implemented. This means that only specific magic
+methods are supported. The supported list includes *almost* all of them. If
+there are any missing that you need please let us know!
+
+You mock magic methods by setting the method you are interested in to a function
+or a mock instance. If you are using a function then it *must* take ``self`` as
+the first argument [#]_.
+
+.. doctest::
+
+ >>> def __str__(self):
+ ... return 'fooble'
+ ...
+ >>> mock = Mock()
+ >>> mock.__str__ = __str__
+ >>> str(mock)
+ 'fooble'
+
+ >>> mock = Mock()
+ >>> mock.__str__ = Mock()
+ >>> mock.__str__.return_value = 'fooble'
+ >>> str(mock)
+ 'fooble'
+
+ >>> mock = Mock()
+ >>> mock.__iter__ = Mock(return_value=iter([]))
+ >>> list(mock)
+ []
+
+One use case for this is for mocking objects used as context managers in a
+`with` statement:
+
+.. doctest::
+
+ >>> mock = Mock()
+ >>> mock.__enter__ = Mock(return_value='foo')
+ >>> mock.__exit__ = Mock(return_value=False)
+ >>> with mock as m:
+ ... assert m == 'foo'
+ ...
+ >>> mock.__enter__.assert_called_with()
+ >>> mock.__exit__.assert_called_with(None, None, None)
+
+Calls to magic methods do not appear in :attr:`~Mock.method_calls`, but they
+are recorded in :attr:`~Mock.mock_calls`.
+
+.. note::
+
+ If you use the `spec` keyword argument to create a mock then attempting to
+ set a magic method that isn't in the spec will raise an `AttributeError`.
+
+The full list of supported magic methods is:
+
+* ``__hash__``, ``__sizeof__``, ``__repr__`` and ``__str__``
+* ``__dir__``, ``__format__`` and ``__subclasses__``
+* ``__floor__``, ``__trunc__`` and ``__ceil__``
+* Comparisons: ``__cmp__``, ``__lt__``, ``__gt__``, ``__le__``, ``__ge__``,
+ ``__eq__`` and ``__ne__``
+* Container methods: ``__getitem__``, ``__setitem__``, ``__delitem__``,
+ ``__contains__``, ``__len__``, ``__iter__``, ``__getslice__``,
+ ``__setslice__``, ``__reversed__`` and ``__missing__``
+* Context manager: ``__enter__`` and ``__exit__``
+* Unary numeric methods: ``__neg__``, ``__pos__`` and ``__invert__``
+* The numeric methods (including right hand and in-place variants):
+ ``__add__``, ``__sub__``, ``__mul__``, ``__div__``,
+ ``__floordiv__``, ``__mod__``, ``__divmod__``, ``__lshift__``,
+ ``__rshift__``, ``__and__``, ``__xor__``, ``__or__``, and ``__pow__``
+* Numeric conversion methods: ``__complex__``, ``__int__``, ``__float__``,
+ ``__index__`` and ``__coerce__``
+* Descriptor methods: ``__get__``, ``__set__`` and ``__delete__``
+* Pickling: ``__reduce__``, ``__reduce_ex__``, ``__getinitargs__``,
+ ``__getnewargs__``, ``__getstate__`` and ``__setstate__``
+
+
+The following methods are supported in Python 2 but don't exist in Python 3:
+
+* ``__unicode__``, ``__long__``, ``__oct__``, ``__hex__`` and ``__nonzero__``
+* ``__truediv__`` and ``__rtruediv__``
+
+The following methods are supported in Python 3 but don't exist in Python 2:
+
+* ``__bool__`` and ``__next__``
+
+The following methods exist but are *not* supported as they are either in use by
+mock, can't be set dynamically, or can cause problems:
+
+* ``__getattr__``, ``__setattr__``, ``__init__`` and ``__new__``
+* ``__prepare__``, ``__instancecheck__``, ``__subclasscheck__``, ``__del__``
+
+
+
+Magic Mock
+==========
+
+There are two `MagicMock` variants: `MagicMock` and `NonCallableMagicMock`.
+
+
+.. class:: MagicMock(*args, **kw)
+
+ ``MagicMock`` is a subclass of :class:`Mock` with default implementations
+ of most of the magic methods. You can use ``MagicMock`` without having to
+ configure the magic methods yourself.
+
+ The constructor parameters have the same meaning as for :class:`Mock`.
+
+ If you use the `spec` or `spec_set` arguments then *only* magic methods
+ that exist in the spec will be created.
+
+
+.. class:: NonCallableMagicMock(*args, **kw)
+
+ A non-callable version of `MagicMock`.
+
+ The constructor parameters have the same meaning as for
+ :class:`MagicMock`, with the exception of `return_value` and
+ `side_effect` which have no meaning on a non-callable mock.
+
+The magic methods are setup with `MagicMock` objects, so you can configure them
+and use them in the usual way:
+
+.. doctest::
+
+ >>> mock = MagicMock()
+ >>> mock[3] = 'fish'
+ >>> mock.__setitem__.assert_called_with(3, 'fish')
+ >>> mock.__getitem__.return_value = 'result'
+ >>> mock[2]
+ 'result'
+
+By default many of the protocol methods are required to return objects of a
+specific type. These methods are preconfigured with a default return value, so
+that they can be used without you having to do anything if you aren't interested
+in the return value. You can still *set* the return value manually if you want
+to change the default.
+
+Methods and their defaults:
+
+* ``__lt__``: NotImplemented
+* ``__gt__``: NotImplemented
+* ``__le__``: NotImplemented
+* ``__ge__``: NotImplemented
+* ``__int__`` : 1
+* ``__contains__`` : False
+* ``__len__`` : 1
+* ``__iter__`` : iter([])
+* ``__exit__`` : False
+* ``__complex__`` : 1j
+* ``__float__`` : 1.0
+* ``__bool__`` : True
+* ``__nonzero__`` : True
+* ``__oct__`` : '1'
+* ``__hex__`` : '0x1'
+* ``__long__`` : long(1)
+* ``__index__`` : 1
+* ``__hash__`` : default hash for the mock
+* ``__str__`` : default str for the mock
+* ``__unicode__`` : default unicode for the mock
+* ``__sizeof__``: default sizeof for the mock
+
+For example:
+
+.. doctest::
+
+ >>> mock = MagicMock()
+ >>> int(mock)
+ 1
+ >>> len(mock)
+ 0
+ >>> hex(mock)
+ '0x1'
+ >>> list(mock)
+ []
+ >>> object() in mock
+ False
+
+The two equality method, `__eq__` and `__ne__`, are special (changed in
+0.7.2). They do the default equality comparison on identity, using a side
+effect, unless you change their return value to return something else:
+
+.. doctest::
+
+ >>> MagicMock() == 3
+ False
+ >>> MagicMock() != 3
+ True
+ >>> mock = MagicMock()
+ >>> mock.__eq__.return_value = True
+ >>> mock == 3
+ True
+
+In `0.8` the `__iter__` also gained special handling implemented with a
+side effect. The return value of `MagicMock.__iter__` can be any iterable
+object and isn't required to be an iterator:
+
+.. doctest::
+
+ >>> mock = MagicMock()
+ >>> mock.__iter__.return_value = ['a', 'b', 'c']
+ >>> list(mock)
+ ['a', 'b', 'c']
+ >>> list(mock)
+ ['a', 'b', 'c']
+
+If the return value *is* an iterator, then iterating over it once will consume
+it and subsequent iterations will result in an empty list:
+
+.. doctest::
+
+ >>> mock.__iter__.return_value = iter(['a', 'b', 'c'])
+ >>> list(mock)
+ ['a', 'b', 'c']
+ >>> list(mock)
+ []
+
+``MagicMock`` has all of the supported magic methods configured except for some
+of the obscure and obsolete ones. You can still set these up if you want.
+
+Magic methods that are supported but not setup by default in ``MagicMock`` are:
+
+* ``__cmp__``
+* ``__getslice__`` and ``__setslice__``
+* ``__coerce__``
+* ``__subclasses__``
+* ``__dir__``
+* ``__format__``
+* ``__get__``, ``__set__`` and ``__delete__``
+* ``__reversed__`` and ``__missing__``
+* ``__reduce__``, ``__reduce_ex__``, ``__getinitargs__``, ``__getnewargs__``,
+ ``__getstate__`` and ``__setstate__``
+* ``__getformat__`` and ``__setformat__``
+
+
+
+------------
+
+.. [#] Magic methods *should* be looked up on the class rather than the
+ instance. Different versions of Python are inconsistent about applying this
+ rule. The supported protocol methods should work with all supported versions
+ of Python.
+.. [#] The function is basically hooked up to the class, but each ``Mock``
+ instance is kept isolated from the others.
Added: incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/mock.txt
URL: http://svn.apache.org/viewvc/incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/mock.txt?rev=1442010&view=auto
==============================================================================
--- incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/mock.txt (added)
+++ incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/mock.txt Mon Feb 4 02:23:55 2013
@@ -0,0 +1,842 @@
+The Mock Class
+==============
+
+.. currentmodule:: mock
+
+.. testsetup::
+
+ class SomeClass:
+ pass
+
+
+`Mock` is a flexible mock object intended to replace the use of stubs and
+test doubles throughout your code. Mocks are callable and create attributes as
+new mocks when you access them [#]_. Accessing the same attribute will always
+return the same mock. Mocks record how you use them, allowing you to make
+assertions about what your code has done to them.
+
+:class:`MagicMock` is a subclass of `Mock` with all the magic methods
+pre-created and ready to use. There are also non-callable variants, useful
+when you are mocking out objects that aren't callable:
+:class:`NonCallableMock` and :class:`NonCallableMagicMock`
+
+The :func:`patch` decorators makes it easy to temporarily replace classes
+in a particular module with a `Mock` object. By default `patch` will create
+a `MagicMock` for you. You can specify an alternative class of `Mock` using
+the `new_callable` argument to `patch`.
+
+
+.. index:: side_effect
+.. index:: return_value
+.. index:: wraps
+.. index:: name
+.. index:: spec
+
+.. class:: Mock(spec=None, side_effect=None, return_value=DEFAULT, wraps=None, name=None, spec_set=None, **kwargs)
+
+ Create a new `Mock` object. `Mock` takes several optional arguments
+ that specify the behaviour of the Mock object:
+
+ * `spec`: This can be either a list of strings or an existing object (a
+ class or instance) that acts as the specification for the mock object. If
+ you pass in an object then a list of strings is formed by calling dir on
+ the object (excluding unsupported magic attributes and methods).
+ Accessing any attribute not in this list will raise an `AttributeError`.
+
+ If `spec` is an object (rather than a list of strings) then
+ :attr:`__class__` returns the class of the spec object. This allows mocks
+ to pass `isinstance` tests.
+
+ * `spec_set`: A stricter variant of `spec`. If used, attempting to *set*
+ or get an attribute on the mock that isn't on the object passed as
+ `spec_set` will raise an `AttributeError`.
+
+ * `side_effect`: A function to be called whenever the Mock is called. See
+ the :attr:`~Mock.side_effect` attribute. Useful for raising exceptions or
+ dynamically changing return values. The function is called with the same
+ arguments as the mock, and unless it returns :data:`DEFAULT`, the return
+ value of this function is used as the return value.
+
+ Alternatively `side_effect` can be an exception class or instance. In
+ this case the exception will be raised when the mock is called.
+
+ If `side_effect` is an iterable then each call to the mock will return
+ the next value from the iterable. If any of the members of the iterable
+ are exceptions they will be raised instead of returned.
+
+ A `side_effect` can be cleared by setting it to `None`.
+
+ * `return_value`: The value returned when the mock is called. By default
+ this is a new Mock (created on first access). See the
+ :attr:`return_value` attribute.
+
+ * `wraps`: Item for the mock object to wrap. If `wraps` is not None then
+ calling the Mock will pass the call through to the wrapped object
+ (returning the real result and ignoring `return_value`). Attribute access
+ on the mock will return a Mock object that wraps the corresponding
+ attribute of the wrapped object (so attempting to access an attribute
+ that doesn't exist will raise an `AttributeError`).
+
+ If the mock has an explicit `return_value` set then calls are not passed
+ to the wrapped object and the `return_value` is returned instead.
+
+ * `name`: If the mock has a name then it will be used in the repr of the
+ mock. This can be useful for debugging. The name is propagated to child
+ mocks.
+
+ Mocks can also be called with arbitrary keyword arguments. These will be
+ used to set attributes on the mock after it is created. See the
+ :meth:`configure_mock` method for details.
+
+
+ .. method:: assert_called_with(*args, **kwargs)
+
+ This method is a convenient way of asserting that calls are made in a
+ particular way:
+
+ .. doctest::
+
+ >>> mock = Mock()
+ >>> mock.method(1, 2, 3, test='wow')
+ <Mock name='mock.method()' id='...'>
+ >>> mock.method.assert_called_with(1, 2, 3, test='wow')
+
+
+ .. method:: assert_called_once_with(*args, **kwargs)
+
+ Assert that the mock was called exactly once and with the specified
+ arguments.
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=None)
+ >>> mock('foo', bar='baz')
+ >>> mock.assert_called_once_with('foo', bar='baz')
+ >>> mock('foo', bar='baz')
+ >>> mock.assert_called_once_with('foo', bar='baz')
+ Traceback (most recent call last):
+ ...
+ AssertionError: Expected to be called once. Called 2 times.
+
+
+ .. method:: assert_any_call(*args, **kwargs)
+
+ assert the mock has been called with the specified arguments.
+
+ The assert passes if the mock has *ever* been called, unlike
+ :meth:`assert_called_with` and :meth:`assert_called_once_with` that
+ only pass if the call is the most recent one.
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=None)
+ >>> mock(1, 2, arg='thing')
+ >>> mock('some', 'thing', 'else')
+ >>> mock.assert_any_call(1, 2, arg='thing')
+
+
+ .. method:: assert_has_calls(calls, any_order=False)
+
+ assert the mock has been called with the specified calls.
+ The `mock_calls` list is checked for the calls.
+
+ If `any_order` is False (the default) then the calls must be
+ sequential. There can be extra calls before or after the
+ specified calls.
+
+ If `any_order` is True then the calls can be in any order, but
+ they must all appear in :attr:`mock_calls`.
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=None)
+ >>> mock(1)
+ >>> mock(2)
+ >>> mock(3)
+ >>> mock(4)
+ >>> calls = [call(2), call(3)]
+ >>> mock.assert_has_calls(calls)
+ >>> calls = [call(4), call(2), call(3)]
+ >>> mock.assert_has_calls(calls, any_order=True)
+
+
+ .. method:: reset_mock()
+
+ The reset_mock method resets all the call attributes on a mock object:
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=None)
+ >>> mock('hello')
+ >>> mock.called
+ True
+ >>> mock.reset_mock()
+ >>> mock.called
+ False
+
+ This can be useful where you want to make a series of assertions that
+ reuse the same object. Note that `reset_mock` *doesn't* clear the
+ return value, :attr:`side_effect` or any child attributes you have
+ set using normal assignment. Child mocks and the return value mock
+ (if any) are reset as well.
+
+
+ .. method:: mock_add_spec(spec, spec_set=False)
+
+ Add a spec to a mock. `spec` can either be an object or a
+ list of strings. Only attributes on the `spec` can be fetched as
+ attributes from the mock.
+
+ If `spec_set` is `True` then only attributes on the spec can be set.
+
+
+ .. method:: attach_mock(mock, attribute)
+
+ Attach a mock as an attribute of this one, replacing its name and
+ parent. Calls to the attached mock will be recorded in the
+ :attr:`method_calls` and :attr:`mock_calls` attributes of this one.
+
+
+ .. method:: configure_mock(**kwargs)
+
+ Set attributes on the mock through keyword arguments.
+
+ Attributes plus return values and side effects can be set on child
+ mocks using standard dot notation and unpacking a dictionary in the
+ method call:
+
+ .. doctest::
+
+ >>> mock = Mock()
+ >>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
+ >>> mock.configure_mock(**attrs)
+ >>> mock.method()
+ 3
+ >>> mock.other()
+ Traceback (most recent call last):
+ ...
+ KeyError
+
+ The same thing can be achieved in the constructor call to mocks:
+
+ .. doctest::
+
+ >>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
+ >>> mock = Mock(some_attribute='eggs', **attrs)
+ >>> mock.some_attribute
+ 'eggs'
+ >>> mock.method()
+ 3
+ >>> mock.other()
+ Traceback (most recent call last):
+ ...
+ KeyError
+
+ `configure_mock` exists to make it easier to do configuration
+ after the mock has been created.
+
+
+ .. method:: __dir__()
+
+ `Mock` objects limit the results of `dir(some_mock)` to useful results.
+ For mocks with a `spec` this includes all the permitted attributes
+ for the mock.
+
+ See :data:`FILTER_DIR` for what this filtering does, and how to
+ switch it off.
+
+
+ .. method:: _get_child_mock(**kw)
+
+ Create the child mocks for attributes and return value.
+ By default child mocks will be the same type as the parent.
+ Subclasses of Mock may want to override this to customize the way
+ child mocks are made.
+
+ For non-callable mocks the callable variant will be used (rather than
+ any custom subclass).
+
+
+ .. attribute:: called
+
+ A boolean representing whether or not the mock object has been called:
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=None)
+ >>> mock.called
+ False
+ >>> mock()
+ >>> mock.called
+ True
+
+ .. attribute:: call_count
+
+ An integer telling you how many times the mock object has been called:
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=None)
+ >>> mock.call_count
+ 0
+ >>> mock()
+ >>> mock()
+ >>> mock.call_count
+ 2
+
+
+ .. attribute:: return_value
+
+ Set this to configure the value returned by calling the mock:
+
+ .. doctest::
+
+ >>> mock = Mock()
+ >>> mock.return_value = 'fish'
+ >>> mock()
+ 'fish'
+
+ The default return value is a mock object and you can configure it in
+ the normal way:
+
+ .. doctest::
+
+ >>> mock = Mock()
+ >>> mock.return_value.attribute = sentinel.Attribute
+ >>> mock.return_value()
+ <Mock name='mock()()' id='...'>
+ >>> mock.return_value.assert_called_with()
+
+ `return_value` can also be set in the constructor:
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=3)
+ >>> mock.return_value
+ 3
+ >>> mock()
+ 3
+
+
+ .. attribute:: side_effect
+
+ This can either be a function to be called when the mock is called,
+ or an exception (class or instance) to be raised.
+
+ If you pass in a function it will be called with same arguments as the
+ mock and unless the function returns the :data:`DEFAULT` singleton the
+ call to the mock will then return whatever the function returns. If the
+ function returns :data:`DEFAULT` then the mock will return its normal
+ value (from the :attr:`return_value`.
+
+ An example of a mock that raises an exception (to test exception
+ handling of an API):
+
+ .. doctest::
+
+ >>> mock = Mock()
+ >>> mock.side_effect = Exception('Boom!')
+ >>> mock()
+ Traceback (most recent call last):
+ ...
+ Exception: Boom!
+
+ Using `side_effect` to return a sequence of values:
+
+ .. doctest::
+
+ >>> mock = Mock()
+ >>> mock.side_effect = [3, 2, 1]
+ >>> mock(), mock(), mock()
+ (3, 2, 1)
+
+ The `side_effect` function is called with the same arguments as the
+ mock (so it is wise for it to take arbitrary args and keyword
+ arguments) and whatever it returns is used as the return value for
+ the call. The exception is if `side_effect` returns :data:`DEFAULT`,
+ in which case the normal :attr:`return_value` is used.
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=3)
+ >>> def side_effect(*args, **kwargs):
+ ... return DEFAULT
+ ...
+ >>> mock.side_effect = side_effect
+ >>> mock()
+ 3
+
+ `side_effect` can be set in the constructor. Here's an example that
+ adds one to the value the mock is called with and returns it:
+
+ .. doctest::
+
+ >>> side_effect = lambda value: value + 1
+ >>> mock = Mock(side_effect=side_effect)
+ >>> mock(3)
+ 4
+ >>> mock(-8)
+ -7
+
+ Setting `side_effect` to `None` clears it:
+
+ .. doctest::
+
+ >>> from mock import Mock
+ >>> m = Mock(side_effect=KeyError, return_value=3)
+ >>> m()
+ Traceback (most recent call last):
+ ...
+ KeyError
+ >>> m.side_effect = None
+ >>> m()
+ 3
+
+
+ .. attribute:: call_args
+
+ This is either `None` (if the mock hasn't been called), or the
+ arguments that the mock was last called with. This will be in the
+ form of a tuple: the first member is any ordered arguments the mock
+ was called with (or an empty tuple) and the second member is any
+ keyword arguments (or an empty dictionary).
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=None)
+ >>> print mock.call_args
+ None
+ >>> mock()
+ >>> mock.call_args
+ call()
+ >>> mock.call_args == ()
+ True
+ >>> mock(3, 4)
+ >>> mock.call_args
+ call(3, 4)
+ >>> mock.call_args == ((3, 4),)
+ True
+ >>> mock(3, 4, 5, key='fish', next='w00t!')
+ >>> mock.call_args
+ call(3, 4, 5, key='fish', next='w00t!')
+
+ `call_args`, along with members of the lists :attr:`call_args_list`,
+ :attr:`method_calls` and :attr:`mock_calls` are :data:`call` objects.
+ These are tuples, so they can be unpacked to get at the individual
+ arguments and make more complex assertions. See
+ :ref:`calls as tuples <calls-as-tuples>`.
+
+
+ .. attribute:: call_args_list
+
+ This is a list of all the calls made to the mock object in sequence
+ (so the length of the list is the number of times it has been
+ called). Before any calls have been made it is an empty list. The
+ :data:`call` object can be used for conveniently constructing lists of
+ calls to compare with `call_args_list`.
+
+ .. doctest::
+
+ >>> mock = Mock(return_value=None)
+ >>> mock()
+ >>> mock(3, 4)
+ >>> mock(key='fish', next='w00t!')
+ >>> mock.call_args_list
+ [call(), call(3, 4), call(key='fish', next='w00t!')]
+ >>> expected = [(), ((3, 4),), ({'key': 'fish', 'next': 'w00t!'},)]
+ >>> mock.call_args_list == expected
+ True
+
+ Members of `call_args_list` are :data:`call` objects. These can be
+ unpacked as tuples to get at the individual arguments. See
+ :ref:`calls as tuples <calls-as-tuples>`.
+
+
+ .. attribute:: method_calls
+
+ As well as tracking calls to themselves, mocks also track calls to
+ methods and attributes, and *their* methods and attributes:
+
+ .. doctest::
+
+ >>> mock = Mock()
+ >>> mock.method()
+ <Mock name='mock.method()' id='...'>
+ >>> mock.property.method.attribute()
+ <Mock name='mock.property.method.attribute()' id='...'>
+ >>> mock.method_calls
+ [call.method(), call.property.method.attribute()]
+
+ Members of `method_calls` are :data:`call` objects. These can be
+ unpacked as tuples to get at the individual arguments. See
+ :ref:`calls as tuples <calls-as-tuples>`.
+
+
+ .. attribute:: mock_calls
+
+ `mock_calls` records *all* calls to the mock object, its methods, magic
+ methods *and* return value mocks.
+
+ .. doctest::
+
+ >>> mock = MagicMock()
+ >>> result = mock(1, 2, 3)
+ >>> mock.first(a=3)
+ <MagicMock name='mock.first()' id='...'>
+ >>> mock.second()
+ <MagicMock name='mock.second()' id='...'>
+ >>> int(mock)
+ 1
+ >>> result(1)
+ <MagicMock name='mock()()' id='...'>
+ >>> expected = [call(1, 2, 3), call.first(a=3), call.second(),
+ ... call.__int__(), call()(1)]
+ >>> mock.mock_calls == expected
+ True
+
+ Members of `mock_calls` are :data:`call` objects. These can be
+ unpacked as tuples to get at the individual arguments. See
+ :ref:`calls as tuples <calls-as-tuples>`.
+
+
+ .. attribute:: __class__
+
+ Normally the `__class__` attribute of an object will return its type.
+ For a mock object with a `spec` `__class__` returns the spec class
+ instead. This allows mock objects to pass `isinstance` tests for the
+ object they are replacing / masquerading as:
+
+ .. doctest::
+
+ >>> mock = Mock(spec=3)
+ >>> isinstance(mock, int)
+ True
+
+ `__class__` is assignable to, this allows a mock to pass an
+ `isinstance` check without forcing you to use a spec:
+
+ .. doctest::
+
+ >>> mock = Mock()
+ >>> mock.__class__ = dict
+ >>> isinstance(mock, dict)
+ True
+
+.. class:: NonCallableMock(spec=None, wraps=None, name=None, spec_set=None, **kwargs)
+
+ A non-callable version of `Mock`. The constructor parameters have the same
+ meaning of `Mock`, with the exception of `return_value` and `side_effect`
+ which have no meaning on a non-callable mock.
+
+Mock objects that use a class or an instance as a `spec` or `spec_set` are able
+to pass `isintance` tests:
+
+.. doctest::
+
+ >>> mock = Mock(spec=SomeClass)
+ >>> isinstance(mock, SomeClass)
+ True
+ >>> mock = Mock(spec_set=SomeClass())
+ >>> isinstance(mock, SomeClass)
+ True
+
+The `Mock` classes have support for mocking magic methods. See :ref:`magic
+methods <magic-methods>` for the full details.
+
+The mock classes and the :func:`patch` decorators all take arbitrary keyword
+arguments for configuration. For the `patch` decorators the keywords are
+passed to the constructor of the mock being created. The keyword arguments
+are for configuring attributes of the mock:
+
+.. doctest::
+
+ >>> m = MagicMock(attribute=3, other='fish')
+ >>> m.attribute
+ 3
+ >>> m.other
+ 'fish'
+
+The return value and side effect of child mocks can be set in the same way,
+using dotted notation. As you can't use dotted names directly in a call you
+have to create a dictionary and unpack it using `**`:
+
+.. doctest::
+
+ >>> attrs = {'method.return_value': 3, 'other.side_effect': KeyError}
+ >>> mock = Mock(some_attribute='eggs', **attrs)
+ >>> mock.some_attribute
+ 'eggs'
+ >>> mock.method()
+ 3
+ >>> mock.other()
+ Traceback (most recent call last):
+ ...
+ KeyError
+
+
+.. class:: PropertyMock(*args, **kwargs)
+
+ A mock intended to be used as a property, or other descriptor, on a class.
+ `PropertyMock` provides `__get__` and `__set__` methods so you can specify
+ a return value when it is fetched.
+
+ Fetching a `PropertyMock` instance from an object calls the mock, with
+ no args. Setting it calls the mock with the value being set.
+
+ .. doctest::
+
+ >>> class Foo(object):
+ ... @property
+ ... def foo(self):
+ ... return 'something'
+ ... @foo.setter
+ ... def foo(self, value):
+ ... pass
+ ...
+ >>> with patch('__main__.Foo.foo', new_callable=PropertyMock) as mock_foo:
+ ... mock_foo.return_value = 'mockity-mock'
+ ... this_foo = Foo()
+ ... print this_foo.foo
+ ... this_foo.foo = 6
+ ...
+ mockity-mock
+ >>> mock_foo.mock_calls
+ [call(), call(6)]
+
+Because of the way mock attributes are stored you can't directly attach a
+`PropertyMock` to a mock object. Instead you can attach it to the mock type
+object:
+
+.. doctest::
+
+ >>> m = MagicMock()
+ >>> p = PropertyMock(return_value=3)
+ >>> type(m).foo = p
+ >>> m.foo
+ 3
+ >>> p.assert_called_once_with()
+
+
+.. index:: __call__
+.. index:: calling
+
+Calling
+=======
+
+Mock objects are callable. The call will return the value set as the
+:attr:`~Mock.return_value` attribute. The default return value is a new Mock
+object; it is created the first time the return value is accessed (either
+explicitly or by calling the Mock) - but it is stored and the same one
+returned each time.
+
+Calls made to the object will be recorded in the attributes
+like :attr:`~Mock.call_args` and :attr:`~Mock.call_args_list`.
+
+If :attr:`~Mock.side_effect` is set then it will be called after the call has
+been recorded, so if `side_effect` raises an exception the call is still
+recorded.
+
+The simplest way to make a mock raise an exception when called is to make
+:attr:`~Mock.side_effect` an exception class or instance:
+
+.. doctest::
+
+ >>> m = MagicMock(side_effect=IndexError)
+ >>> m(1, 2, 3)
+ Traceback (most recent call last):
+ ...
+ IndexError
+ >>> m.mock_calls
+ [call(1, 2, 3)]
+ >>> m.side_effect = KeyError('Bang!')
+ >>> m('two', 'three', 'four')
+ Traceback (most recent call last):
+ ...
+ KeyError: 'Bang!'
+ >>> m.mock_calls
+ [call(1, 2, 3), call('two', 'three', 'four')]
+
+If `side_effect` is a function then whatever that function returns is what
+calls to the mock return. The `side_effect` function is called with the
+same arguments as the mock. This allows you to vary the return value of the
+call dynamically, based on the input:
+
+.. doctest::
+
+ >>> def side_effect(value):
+ ... return value + 1
+ ...
+ >>> m = MagicMock(side_effect=side_effect)
+ >>> m(1)
+ 2
+ >>> m(2)
+ 3
+ >>> m.mock_calls
+ [call(1), call(2)]
+
+If you want the mock to still return the default return value (a new mock), or
+any set return value, then there are two ways of doing this. Either return
+`mock.return_value` from inside `side_effect`, or return :data:`DEFAULT`:
+
+.. doctest::
+
+ >>> m = MagicMock()
+ >>> def side_effect(*args, **kwargs):
+ ... return m.return_value
+ ...
+ >>> m.side_effect = side_effect
+ >>> m.return_value = 3
+ >>> m()
+ 3
+ >>> def side_effect(*args, **kwargs):
+ ... return DEFAULT
+ ...
+ >>> m.side_effect = side_effect
+ >>> m()
+ 3
+
+To remove a `side_effect`, and return to the default behaviour, set the
+`side_effect` to `None`:
+
+.. doctest::
+
+ >>> m = MagicMock(return_value=6)
+ >>> def side_effect(*args, **kwargs):
+ ... return 3
+ ...
+ >>> m.side_effect = side_effect
+ >>> m()
+ 3
+ >>> m.side_effect = None
+ >>> m()
+ 6
+
+The `side_effect` can also be any iterable object. Repeated calls to the mock
+will return values from the iterable (until the iterable is exhausted and
+a `StopIteration` is raised):
+
+.. doctest::
+
+ >>> m = MagicMock(side_effect=[1, 2, 3])
+ >>> m()
+ 1
+ >>> m()
+ 2
+ >>> m()
+ 3
+ >>> m()
+ Traceback (most recent call last):
+ ...
+ StopIteration
+
+If any members of the iterable are exceptions they will be raised instead of
+returned:
+
+.. doctest::
+
+ >>> iterable = (33, ValueError, 66)
+ >>> m = MagicMock(side_effect=iterable)
+ >>> m()
+ 33
+ >>> m()
+ Traceback (most recent call last):
+ ...
+ ValueError
+ >>> m()
+ 66
+
+
+.. _deleting-attributes:
+
+Deleting Attributes
+===================
+
+Mock objects create attributes on demand. This allows them to pretend to be
+objects of any type.
+
+You may want a mock object to return `False` to a `hasattr` call, or raise an
+`AttributeError` when an attribute is fetched. You can do this by providing
+an object as a `spec` for a mock, but that isn't always convenient.
+
+You "block" attributes by deleting them. Once deleted, accessing an attribute
+will raise an `AttributeError`.
+
+.. doctest::
+
+ >>> mock = MagicMock()
+ >>> hasattr(mock, 'm')
+ True
+ >>> del mock.m
+ >>> hasattr(mock, 'm')
+ False
+ >>> del mock.f
+ >>> mock.f
+ Traceback (most recent call last):
+ ...
+ AttributeError: f
+
+
+Attaching Mocks as Attributes
+=============================
+
+When you attach a mock as an attribute of another mock (or as the return
+value) it becomes a "child" of that mock. Calls to the child are recorded in
+the :attr:`~Mock.method_calls` and :attr:`~Mock.mock_calls` attributes of the
+parent. This is useful for configuring child mocks and then attaching them to
+the parent, or for attaching mocks to a parent that records all calls to the
+children and allows you to make assertions about the order of calls between
+mocks:
+
+.. doctest::
+
+ >>> parent = MagicMock()
+ >>> child1 = MagicMock(return_value=None)
+ >>> child2 = MagicMock(return_value=None)
+ >>> parent.child1 = child1
+ >>> parent.child2 = child2
+ >>> child1(1)
+ >>> child2(2)
+ >>> parent.mock_calls
+ [call.child1(1), call.child2(2)]
+
+The exception to this is if the mock has a name. This allows you to prevent
+the "parenting" if for some reason you don't want it to happen.
+
+.. doctest::
+
+ >>> mock = MagicMock()
+ >>> not_a_child = MagicMock(name='not-a-child')
+ >>> mock.attribute = not_a_child
+ >>> mock.attribute()
+ <MagicMock name='not-a-child()' id='...'>
+ >>> mock.mock_calls
+ []
+
+Mocks created for you by :func:`patch` are automatically given names. To
+attach mocks that have names to a parent you use the :meth:`~Mock.attach_mock`
+method:
+
+.. doctest::
+
+ >>> thing1 = object()
+ >>> thing2 = object()
+ >>> parent = MagicMock()
+ >>> with patch('__main__.thing1', return_value=None) as child1:
+ ... with patch('__main__.thing2', return_value=None) as child2:
+ ... parent.attach_mock(child1, 'child1')
+ ... parent.attach_mock(child2, 'child2')
+ ... child1('one')
+ ... child2('two')
+ ...
+ >>> parent.mock_calls
+ [call.child1('one'), call.child2('two')]
+
+
+-----
+
+.. [#] The only exceptions are magic methods and attributes (those that have
+ leading and trailing double underscores). Mock doesn't create these but
+ instead of raises an ``AttributeError``. This is because the interpreter
+ will often implicitly request these methods, and gets *very* confused to
+ get a new Mock object when it expects a magic method. If you need magic
+ method support see :ref:`magic methods <magic-methods>`.
Added: incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/patch.txt
URL: http://svn.apache.org/viewvc/incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/patch.txt?rev=1442010&view=auto
==============================================================================
--- incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/patch.txt (added)
+++ incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/patch.txt Mon Feb 4 02:23:55 2013
@@ -0,0 +1,636 @@
+==================
+ Patch Decorators
+==================
+
+
+.. currentmodule:: mock
+
+.. testsetup::
+
+ class SomeClass(object):
+ static_method = None
+ class_method = None
+ attribute = None
+
+ sys.modules['package'] = package = Mock(name='package')
+ sys.modules['package.module'] = package.module
+
+ class TestCase(unittest2.TestCase):
+ def run(self):
+ result = unittest2.TestResult()
+ super(unittest2.TestCase, self).run(result)
+ assert result.wasSuccessful()
+
+.. testcleanup::
+
+ patch.TEST_PREFIX = 'test'
+
+
+The patch decorators are used for patching objects only within the scope of
+the function they decorate. They automatically handle the unpatching for you,
+even if exceptions are raised. All of these functions can also be used in with
+statements or as class decorators.
+
+
+patch
+=====
+
+.. note::
+
+ `patch` is straightforward to use. The key is to do the patching in the
+ right namespace. See the section `where to patch`_.
+
+.. function:: patch(target, new=DEFAULT, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)
+
+ `patch` acts as a function decorator, class decorator or a context
+ manager. Inside the body of the function or with statement, the `target`
+ is patched with a `new` object. When the function/with statement exits
+ the patch is undone.
+
+ If `new` is omitted, then the target is replaced with a
+ :class:`MagicMock`. If `patch` is used as a decorator and `new` is
+ omitted, the created mock is passed in as an extra argument to the
+ decorated function. If `patch` is used as a context manager the created
+ mock is returned by the context manager.
+
+ `target` should be a string in the form `'package.module.ClassName'`. The
+ `target` is imported and the specified object replaced with the `new`
+ object, so the `target` must be importable from the environment you are
+ calling `patch` from. The target is imported when the decorated function
+ is executed, not at decoration time.
+
+ The `spec` and `spec_set` keyword arguments are passed to the `MagicMock`
+ if patch is creating one for you.
+
+ In addition you can pass `spec=True` or `spec_set=True`, which causes
+ patch to pass in the object being mocked as the spec/spec_set object.
+
+ `new_callable` allows you to specify a different class, or callable object,
+ that will be called to create the `new` object. By default `MagicMock` is
+ used.
+
+ A more powerful form of `spec` is `autospec`. If you set `autospec=True`
+ then the mock with be created with a spec from the object being replaced.
+ All attributes of the mock will also have the spec of the corresponding
+ attribute of the object being replaced. Methods and functions being mocked
+ will have their arguments checked and will raise a `TypeError` if they are
+ called with the wrong signature. For mocks
+ replacing a class, their return value (the 'instance') will have the same
+ spec as the class. See the :func:`create_autospec` function and
+ :ref:`auto-speccing`.
+
+ Instead of `autospec=True` you can pass `autospec=some_object` to use an
+ arbitrary object as the spec instead of the one being replaced.
+
+ By default `patch` will fail to replace attributes that don't exist. If
+ you pass in `create=True`, and the attribute doesn't exist, patch will
+ create the attribute for you when the patched function is called, and
+ delete it again afterwards. This is useful for writing tests against
+ attributes that your production code creates at runtime. It is off by by
+ default because it can be dangerous. With it switched on you can write
+ passing tests against APIs that don't actually exist!
+
+ Patch can be used as a `TestCase` class decorator. It works by
+ decorating each test method in the class. This reduces the boilerplate
+ code when your test methods share a common patchings set. `patch` finds
+ tests by looking for method names that start with `patch.TEST_PREFIX`.
+ By default this is `test`, which matches the way `unittest` finds tests.
+ You can specify an alternative prefix by setting `patch.TEST_PREFIX`.
+
+ Patch can be used as a context manager, with the with statement. Here the
+ patching applies to the indented block after the with statement. If you
+ use "as" then the patched object will be bound to the name after the
+ "as"; very useful if `patch` is creating a mock object for you.
+
+ `patch` takes arbitrary keyword arguments. These will be passed to
+ the `Mock` (or `new_callable`) on construction.
+
+ `patch.dict(...)`, `patch.multiple(...)` and `patch.object(...)` are
+ available for alternate use-cases.
+
+`patch` as function decorator, creating the mock for you and passing it into
+the decorated function:
+
+.. doctest::
+
+ >>> @patch('__main__.SomeClass')
+ ... def function(normal_argument, mock_class):
+ ... print mock_class is SomeClass
+ ...
+ >>> function(None)
+ True
+
+
+Patching a class replaces the class with a `MagicMock` *instance*. If the
+class is instantiated in the code under test then it will be the
+:attr:`~Mock.return_value` of the mock that will be used.
+
+If the class is instantiated multiple times you could use
+:attr:`~Mock.side_effect` to return a new mock each time. Alternatively you
+can set the `return_value` to be anything you want.
+
+To configure return values on methods of *instances* on the patched class
+you must do this on the `return_value`. For example:
+
+.. doctest::
+
+ >>> class Class(object):
+ ... def method(self):
+ ... pass
+ ...
+ >>> with patch('__main__.Class') as MockClass:
+ ... instance = MockClass.return_value
+ ... instance.method.return_value = 'foo'
+ ... assert Class() is instance
+ ... assert Class().method() == 'foo'
+ ...
+
+If you use `spec` or `spec_set` and `patch` is replacing a *class*, then the
+return value of the created mock will have the same spec.
+
+.. doctest::
+
+ >>> Original = Class
+ >>> patcher = patch('__main__.Class', spec=True)
+ >>> MockClass = patcher.start()
+ >>> instance = MockClass()
+ >>> assert isinstance(instance, Original)
+ >>> patcher.stop()
+
+The `new_callable` argument is useful where you want to use an alternative
+class to the default :class:`MagicMock` for the created mock. For example, if
+you wanted a :class:`NonCallableMock` to be used:
+
+.. doctest::
+
+ >>> thing = object()
+ >>> with patch('__main__.thing', new_callable=NonCallableMock) as mock_thing:
+ ... assert thing is mock_thing
+ ... thing()
+ ...
+ Traceback (most recent call last):
+ ...
+ TypeError: 'NonCallableMock' object is not callable
+
+Another use case might be to replace an object with a `StringIO` instance:
+
+.. doctest::
+
+ >>> from StringIO import StringIO
+ >>> def foo():
+ ... print 'Something'
+ ...
+ >>> @patch('sys.stdout', new_callable=StringIO)
+ ... def test(mock_stdout):
+ ... foo()
+ ... assert mock_stdout.getvalue() == 'Something\n'
+ ...
+ >>> test()
+
+When `patch` is creating a mock for you, it is common that the first thing
+you need to do is to configure the mock. Some of that configuration can be done
+in the call to patch. Any arbitrary keywords you pass into the call will be
+used to set attributes on the created mock:
+
+.. doctest::
+
+ >>> patcher = patch('__main__.thing', first='one', second='two')
+ >>> mock_thing = patcher.start()
+ >>> mock_thing.first
+ 'one'
+ >>> mock_thing.second
+ 'two'
+
+As well as attributes on the created mock attributes, like the
+:attr:`~Mock.return_value` and :attr:`~Mock.side_effect`, of child mocks can
+also be configured. These aren't syntactically valid to pass in directly as
+keyword arguments, but a dictionary with these as keys can still be expanded
+into a `patch` call using `**`:
+
+.. doctest::
+
+ >>> config = {'method.return_value': 3, 'other.side_effect': KeyError}
+ >>> patcher = patch('__main__.thing', **config)
+ >>> mock_thing = patcher.start()
+ >>> mock_thing.method()
+ 3
+ >>> mock_thing.other()
+ Traceback (most recent call last):
+ ...
+ KeyError
+
+
+patch.object
+============
+
+.. function:: patch.object(target, attribute, new=DEFAULT, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)
+
+ patch the named member (`attribute`) on an object (`target`) with a mock
+ object.
+
+ `patch.object` can be used as a decorator, class decorator or a context
+ manager. Arguments `new`, `spec`, `create`, `spec_set`, `autospec` and
+ `new_callable` have the same meaning as for `patch`. Like `patch`,
+ `patch.object` takes arbitrary keyword arguments for configuring the mock
+ object it creates.
+
+ When used as a class decorator `patch.object` honours `patch.TEST_PREFIX`
+ for choosing which methods to wrap.
+
+You can either call `patch.object` with three arguments or two arguments. The
+three argument form takes the object to be patched, the attribute name and the
+object to replace the attribute with.
+
+When calling with the two argument form you omit the replacement object, and a
+mock is created for you and passed in as an extra argument to the decorated
+function:
+
+.. doctest::
+
+ >>> @patch.object(SomeClass, 'class_method')
+ ... def test(mock_method):
+ ... SomeClass.class_method(3)
+ ... mock_method.assert_called_with(3)
+ ...
+ >>> test()
+
+`spec`, `create` and the other arguments to `patch.object` have the same
+meaning as they do for `patch`.
+
+
+patch.dict
+==========
+
+.. function:: patch.dict(in_dict, values=(), clear=False, **kwargs)
+
+ Patch a dictionary, or dictionary like object, and restore the dictionary
+ to its original state after the test.
+
+ `in_dict` can be a dictionary or a mapping like container. If it is a
+ mapping then it must at least support getting, setting and deleting items
+ plus iterating over keys.
+
+ `in_dict` can also be a string specifying the name of the dictionary, which
+ will then be fetched by importing it.
+
+ `values` can be a dictionary of values to set in the dictionary. `values`
+ can also be an iterable of `(key, value)` pairs.
+
+ If `clear` is True then the dictionary will be cleared before the new
+ values are set.
+
+ `patch.dict` can also be called with arbitrary keyword arguments to set
+ values in the dictionary.
+
+ `patch.dict` can be used as a context manager, decorator or class
+ decorator. When used as a class decorator `patch.dict` honours
+ `patch.TEST_PREFIX` for choosing which methods to wrap.
+
+`patch.dict` can be used to add members to a dictionary, or simply let a test
+change a dictionary, and ensure the dictionary is restored when the test
+ends.
+
+.. doctest::
+
+ >>> from mock import patch
+ >>> foo = {}
+ >>> with patch.dict(foo, {'newkey': 'newvalue'}):
+ ... assert foo == {'newkey': 'newvalue'}
+ ...
+ >>> assert foo == {}
+
+ >>> import os
+ >>> with patch.dict('os.environ', {'newkey': 'newvalue'}):
+ ... print os.environ['newkey']
+ ...
+ newvalue
+ >>> assert 'newkey' not in os.environ
+
+Keywords can be used in the `patch.dict` call to set values in the dictionary:
+
+.. doctest::
+
+ >>> mymodule = MagicMock()
+ >>> mymodule.function.return_value = 'fish'
+ >>> with patch.dict('sys.modules', mymodule=mymodule):
+ ... import mymodule
+ ... mymodule.function('some', 'args')
+ ...
+ 'fish'
+
+`patch.dict` can be used with dictionary like objects that aren't actually
+dictionaries. At the very minimum they must support item getting, setting,
+deleting and either iteration or membership test. This corresponds to the
+magic methods `__getitem__`, `__setitem__`, `__delitem__` and either
+`__iter__` or `__contains__`.
+
+.. doctest::
+
+ >>> class Container(object):
+ ... def __init__(self):
+ ... self.values = {}
+ ... def __getitem__(self, name):
+ ... return self.values[name]
+ ... def __setitem__(self, name, value):
+ ... self.values[name] = value
+ ... def __delitem__(self, name):
+ ... del self.values[name]
+ ... def __iter__(self):
+ ... return iter(self.values)
+ ...
+ >>> thing = Container()
+ >>> thing['one'] = 1
+ >>> with patch.dict(thing, one=2, two=3):
+ ... assert thing['one'] == 2
+ ... assert thing['two'] == 3
+ ...
+ >>> assert thing['one'] == 1
+ >>> assert list(thing) == ['one']
+
+
+patch.multiple
+==============
+
+.. function:: patch.multiple(target, spec=None, create=False, spec_set=None, autospec=None, new_callable=None, **kwargs)
+
+ Perform multiple patches in a single call. It takes the object to be
+ patched (either as an object or a string to fetch the object by importing)
+ and keyword arguments for the patches::
+
+ with patch.multiple(settings, FIRST_PATCH='one', SECOND_PATCH='two'):
+ ...
+
+ Use :data:`DEFAULT` as the value if you want `patch.multiple` to create
+ mocks for you. In this case the created mocks are passed into a decorated
+ function by keyword, and a dictionary is returned when `patch.multiple` is
+ used as a context manager.
+
+ `patch.multiple` can be used as a decorator, class decorator or a context
+ manager. The arguments `spec`, `spec_set`, `create`, `autospec` and
+ `new_callable` have the same meaning as for `patch`. These arguments will
+ be applied to *all* patches done by `patch.multiple`.
+
+ When used as a class decorator `patch.multiple` honours `patch.TEST_PREFIX`
+ for choosing which methods to wrap.
+
+If you want `patch.multiple` to create mocks for you, then you can use
+:data:`DEFAULT` as the value. If you use `patch.multiple` as a decorator
+then the created mocks are passed into the decorated function by keyword.
+
+.. doctest::
+
+ >>> thing = object()
+ >>> other = object()
+
+ >>> @patch.multiple('__main__', thing=DEFAULT, other=DEFAULT)
+ ... def test_function(thing, other):
+ ... assert isinstance(thing, MagicMock)
+ ... assert isinstance(other, MagicMock)
+ ...
+ >>> test_function()
+
+`patch.multiple` can be nested with other `patch` decorators, but put arguments
+passed by keyword *after* any of the standard arguments created by `patch`:
+
+.. doctest::
+
+ >>> @patch('sys.exit')
+ ... @patch.multiple('__main__', thing=DEFAULT, other=DEFAULT)
+ ... def test_function(mock_exit, other, thing):
+ ... assert 'other' in repr(other)
+ ... assert 'thing' in repr(thing)
+ ... assert 'exit' in repr(mock_exit)
+ ...
+ >>> test_function()
+
+If `patch.multiple` is used as a context manager, the value returned by the
+context manger is a dictionary where created mocks are keyed by name:
+
+.. doctest::
+
+ >>> with patch.multiple('__main__', thing=DEFAULT, other=DEFAULT) as values:
+ ... assert 'other' in repr(values['other'])
+ ... assert 'thing' in repr(values['thing'])
+ ... assert values['thing'] is thing
+ ... assert values['other'] is other
+ ...
+
+
+.. _start-and-stop:
+
+patch methods: start and stop
+=============================
+
+All the patchers have `start` and `stop` methods. These make it simpler to do
+patching in `setUp` methods or where you want to do multiple patches without
+nesting decorators or with statements.
+
+To use them call `patch`, `patch.object` or `patch.dict` as normal and keep a
+reference to the returned `patcher` object. You can then call `start` to put
+the patch in place and `stop` to undo it.
+
+If you are using `patch` to create a mock for you then it will be returned by
+the call to `patcher.start`.
+
+.. doctest::
+
+ >>> patcher = patch('package.module.ClassName')
+ >>> from package import module
+ >>> original = module.ClassName
+ >>> new_mock = patcher.start()
+ >>> assert module.ClassName is not original
+ >>> assert module.ClassName is new_mock
+ >>> patcher.stop()
+ >>> assert module.ClassName is original
+ >>> assert module.ClassName is not new_mock
+
+
+A typical use case for this might be for doing multiple patches in the `setUp`
+method of a `TestCase`:
+
+.. doctest::
+
+ >>> class MyTest(TestCase):
+ ... def setUp(self):
+ ... self.patcher1 = patch('package.module.Class1')
+ ... self.patcher2 = patch('package.module.Class2')
+ ... self.MockClass1 = self.patcher1.start()
+ ... self.MockClass2 = self.patcher2.start()
+ ...
+ ... def tearDown(self):
+ ... self.patcher1.stop()
+ ... self.patcher2.stop()
+ ...
+ ... def test_something(self):
+ ... assert package.module.Class1 is self.MockClass1
+ ... assert package.module.Class2 is self.MockClass2
+ ...
+ >>> MyTest('test_something').run()
+
+.. caution::
+
+ If you use this technique you must ensure that the patching is "undone" by
+ calling `stop`. This can be fiddlier than you might think, because if an
+ exception is raised in the setUp then tearDown is not called. `unittest2
+ <http://pypi.python.org/pypi/unittest2>`_ cleanup functions make this
+ easier.
+
+ .. doctest::
+
+ >>> class MyTest(TestCase):
+ ... def setUp(self):
+ ... patcher = patch('package.module.Class')
+ ... self.MockClass = patcher.start()
+ ... self.addCleanup(patcher.stop)
+ ...
+ ... def test_something(self):
+ ... assert package.module.Class is self.MockClass
+ ...
+ >>> MyTest('test_something').run()
+
+ As an added bonus you no longer need to keep a reference to the `patcher`
+ object.
+
+It is also possible to stop all patches which have been started by using
+`patch.stopall`.
+
+.. function:: patch.stopall
+
+ Stop all active patches. Only stops patches started with `start`.
+
+
+TEST_PREFIX
+===========
+
+All of the patchers can be used as class decorators. When used in this way
+they wrap every test method on the class. The patchers recognise methods that
+start with `test` as being test methods. This is the same way that the
+`unittest.TestLoader` finds test methods by default.
+
+It is possible that you want to use a different prefix for your tests. You can
+inform the patchers of the different prefix by setting `patch.TEST_PREFIX`:
+
+.. doctest::
+
+ >>> patch.TEST_PREFIX = 'foo'
+ >>> value = 3
+ >>>
+ >>> @patch('__main__.value', 'not three')
+ ... class Thing(object):
+ ... def foo_one(self):
+ ... print value
+ ... def foo_two(self):
+ ... print value
+ ...
+ >>>
+ >>> Thing().foo_one()
+ not three
+ >>> Thing().foo_two()
+ not three
+ >>> value
+ 3
+
+
+Nesting Patch Decorators
+========================
+
+If you want to perform multiple patches then you can simply stack up the
+decorators.
+
+You can stack up multiple patch decorators using this pattern:
+
+.. doctest::
+
+ >>> @patch.object(SomeClass, 'class_method')
+ ... @patch.object(SomeClass, 'static_method')
+ ... def test(mock1, mock2):
+ ... assert SomeClass.static_method is mock1
+ ... assert SomeClass.class_method is mock2
+ ... SomeClass.static_method('foo')
+ ... SomeClass.class_method('bar')
+ ... return mock1, mock2
+ ...
+ >>> mock1, mock2 = test()
+ >>> mock1.assert_called_once_with('foo')
+ >>> mock2.assert_called_once_with('bar')
+
+
+Note that the decorators are applied from the bottom upwards. This is the
+standard way that Python applies decorators. The order of the created mocks
+passed into your test function matches this order.
+
+Like all context-managers patches can be nested using contextlib's nested
+function; *every* patching will appear in the tuple after "as":
+
+.. doctest::
+
+ >>> from contextlib import nested
+ >>> with nested(
+ ... patch('package.module.ClassName1'),
+ ... patch('package.module.ClassName2')
+ ... ) as (MockClass1, MockClass2):
+ ... assert package.module.ClassName1 is MockClass1
+ ... assert package.module.ClassName2 is MockClass2
+ ...
+
+
+.. _where-to-patch:
+
+Where to patch
+==============
+
+`patch` works by (temporarily) changing the object that a *name* points to with
+another one. There can be many names pointing to any individual object, so
+for patching to work you must ensure that you patch the name used by the system
+under test.
+
+The basic principle is that you patch where an object is *looked up*, which
+is not necessarily the same place as where it is defined. A couple of
+examples will help to clarify this.
+
+Imagine we have a project that we want to test with the following structure::
+
+ a.py
+ -> Defines SomeClass
+
+ b.py
+ -> from a import SomeClass
+ -> some_function instantiates SomeClass
+
+Now we want to test `some_function` but we want to mock out `SomeClass` using
+`patch`. The problem is that when we import module b, which we will have to
+do then it imports `SomeClass` from module a. If we use `patch` to mock out
+`a.SomeClass` then it will have no effect on our test; module b already has a
+reference to the *real* `SomeClass` and it looks like our patching had no
+effect.
+
+The key is to patch out `SomeClass` where it is used (or where it is looked up
+). In this case `some_function` will actually look up `SomeClass` in module b,
+where we have imported it. The patching should look like:
+
+ `@patch('b.SomeClass')`
+
+However, consider the alternative scenario where instead of `from a import
+SomeClass` module b does `import a` and `some_function` uses `a.SomeClass`. Both
+of these import forms are common. In this case the class we want to patch is
+being looked up on the a module and so we have to patch `a.SomeClass` instead:
+
+ `@patch('a.SomeClass')`
+
+
+Patching Descriptors and Proxy Objects
+======================================
+
+Since version 0.6.0 both patch_ and patch.object_ have been able to correctly
+patch and restore descriptors: class methods, static methods and properties.
+You should patch these on the *class* rather than an instance.
+
+Since version 0.7.0 patch_ and patch.object_ work correctly with some objects
+that proxy attribute access, like the `django setttings object
+<http://www.voidspace.org.uk/python/weblog/arch_d7_2010_12_04.shtml#e1198>`_.
+
+.. note::
+
+ In django `import settings` and `from django.conf import settings`
+ return different objects. If you are using libraries / apps that do both you
+ may have to patch both. Grrr...
Added: incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/docs/sentinel.txt
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@@ -0,0 +1,58 @@
+==========
+ Sentinel
+==========
+
+
+.. currentmodule:: mock
+
+.. testsetup::
+
+ class ProductionClass(object):
+ def something(self):
+ return self.method()
+
+ class Test(unittest2.TestCase):
+ def testSomething(self):
+ pass
+ self = Test('testSomething')
+
+
+.. data:: sentinel
+
+ The ``sentinel`` object provides a convenient way of providing unique
+ objects for your tests.
+
+ Attributes are created on demand when you access them by name. Accessing
+ the same attribute will always return the same object. The objects
+ returned have a sensible repr so that test failure messages are readable.
+
+
+.. data:: DEFAULT
+
+ The `DEFAULT` object is a pre-created sentinel (actually
+ `sentinel.DEFAULT`). It can be used by :attr:`~Mock.side_effect`
+ functions to indicate that the normal return value should be used.
+
+
+Sentinel Example
+================
+
+Sometimes when testing you need to test that a specific object is passed as an
+argument to another method, or returned. It can be common to create named
+sentinel objects to test this. `sentinel` provides a convenient way of
+creating and testing the identity of objects like this.
+
+In this example we monkey patch `method` to return
+`sentinel.some_object`:
+
+.. doctest::
+
+ >>> real = ProductionClass()
+ >>> real.method = Mock(name="method")
+ >>> real.method.return_value = sentinel.some_object
+ >>> result = real.method()
+ >>> assert result is sentinel.some_object
+ >>> sentinel.some_object
+ sentinel.some_object
+
+
Added: incubator/ambari/branches/branch-1.2/ambari-common/src/test/python/mock/extendmock.py
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@@ -0,0 +1 @@
+# merged into mock.py in Mock 0.7