-----

- gh-102978: Fixes :func:`unittest.mock.patch` not enforcing function
signatures for methods decorated with ``classmethod`` or
``staticmethod`` when patch is called with ``autospec=True``.

- gh-103329: Regression tests for the behaviour of
``unittest.mock.PropertyMock`` were added.

-----

- gh-100740: Fix ``unittest.mock.Mock`` not respecting the spec for
attribute names prefixed with ``assert``.

- gh-100690: ``Mock`` objects which are not unsafe will now raise an
``AttributeError`` when accessing an attribute that matches the name of an
assertion but without the prefix ``assert_``, e.g. accessing
``called_once`` instead of ``assert_called_once``. This is in addition to
this already happening for accessing attributes with prefixes ``assert``,
``assret``, ``asert``, ``aseert``, and ``assrt``.

- gh-96127: ``inspect.signature`` was raising ``TypeError`` on call with
mock objects. Now it correctly returns ``(*args, **kwargs)`` as infered
signature.

-----

- gh-98624: Add a mutex to unittest.mock.NonCallableMock to protect
concurrent access to mock attributes.

- bpo-43478: Mocks can no longer be used as the specs for other Mocks. As a
result, an already-mocked object cannot have an attribute mocked using
`autospec=True` or be the subject of a `create_autospec(...)` call. This
can uncover bugs in tests since these Mock-derived Mocks will always pass
certain tests (e.g. isinstance) and builtin assert functions (e.g.
assert_called_once_with) will unconditionally pass.

- bpo-45156: Fixes infinite loop on :func:`unittest.mock.seal` of mocks
created by :func:`~unittest.create_autospec`.

- bpo-41403: Make :meth:`mock.patch` raise a :exc:`TypeError` with a
relevant error message on invalid arg. Previously it allowed a cryptic
:exc:`AttributeError` to escape.

- gh-91803: Fix an error when using a method of objects mocked with
:func:`unittest.mock.create_autospec` after it was sealed with
:func:`unittest.mock.seal` function.

- bpo-41877: AttributeError for suspected misspellings of assertions on
mocks are now pointing out that the cause are misspelled assertions and
also what to do if the misspelling is actually an intended attribute name.
The unittest.mock document is also updated to reflect the current set of
recognised misspellings.

- bpo-43478: Mocks can no longer be provided as the specs for other Mocks.
As a result, an already-mocked object cannot be passed to `mock.Mock()`.
This can uncover bugs in tests since these Mock-derived Mocks will always
pass certain tests (e.g. isinstance) and builtin assert functions (e.g.
assert_called_once_with) will unconditionally pass.

- bpo-45010: Remove support of special method ``__div__`` in
:mod:`unittest.mock`. It is not used in Python 3.

- gh-84753: :func:`inspect.iscoroutinefunction` now properly returns
``True`` when an instance of :class:`unittest.mock.AsyncMock` is passed to
it.  This makes it consistent with behavior of
:func:`asyncio.iscoroutinefunction`.  Patch by Mehdi ABAAKOUK.

- bpo-46852: Remove the undocumented private ``float.__set_format__()``
method, previously known as ``float.__setformat__()`` in Python 3.7. Its
docstring said: "You probably don't want to use this function. It exists
mainly to be used in Python's test suite." Patch by Victor Stinner.

- gh-98086: Make sure ``patch.dict()`` can be applied on async functions.

- gh-100287: Fix the interaction of :func:`unittest.mock.seal` with
:class:`unittest.mock.AsyncMock`.

- gh-83076: Instantiation of ``Mock()`` and ``AsyncMock()`` is now 3.8x
faster.

- bpo-41877: A check is added against misspellings of autospect, auto_spec
and set_spec being passed as arguments to patch, patch.object and
create_autospec.

-----

- bpo-42532: Remove unexpected call of ``__bool__`` when passing a
``spec_arg`` argument to a Mock.

- bpo-39966: Revert bpo-25597. :class:`unittest.mock.MagicMock` with
wraps' set uses default return values for magic methods.

- bpo-41877: Mock objects which are not unsafe will now raise an
AttributeError if an attribute with the prefix asert, aseert, or assrt is
accessed, in addition to this already happening for the prefixes assert or
assret.

- bpo-40126: Fixed reverting multiple patches in unittest.mock. Patcher's
``__exit__()`` is now never called if its ``__enter__()`` is failed.
Returning true from ``__exit__()`` silences now the exception.

-----

- bpo-39915: Ensure :attr:`unittest.mock.AsyncMock.await_args_list` has
call objects in the order of awaited arguments instead of using
:attr:`unittest.mock.Mock.call_args` which has the last value of the call.
Patch by Karthikeyan Singaravelan.

-----

- Remove the universal marker from the wheel.

-----

- No Changes from 4.0.0b1.

-------

- The release is a fresh cut of cpython's `4a686504`__. All changes to :mod:`mock`
from that commit and before are included in this release along with the
subsequent changes listed below.

__ https://github.com/python/cpython/commit/4a686504eb2bbf69adf78077458508a7ba131667

- bpo-37972: Subscripts to the `unittest.mock.call` objects now receive
the same chaining mechanism as any other custom attributes, so that the
following usage no longer raises a `TypeError`:

call().foo().__getitem__('bar')

Patch by blhsing

- bpo-38839: Fix some unused functions in tests. Patch by Adam Johnson.

- bpo-39485: Fix a bug in :func:`unittest.mock.create_autospec` that
would complain about the wrong number of arguments for custom descriptors
defined in an extension module returning functions.

- bpo-39082: Allow AsyncMock to correctly patch static/class methods

- bpo-38093: Fixes AsyncMock so it doesn't crash when used with
AsyncContextManagers or AsyncIterators.

- bpo-38859: AsyncMock now returns StopAsyncIteration on the exaustion of
a side_effects iterable. Since PEP-479 its Impossible to raise a
StopIteration exception from a coroutine.

- bpo-38163: Child mocks will now detect their type as either synchronous
or asynchronous, asynchronous child mocks will be AsyncMocks and
synchronous child mocks will be either MagicMock or Mock (depending on
their parent type).

- bpo-38473: Use signature from inner mock for autospecced methods
attached with :func:`unittest.mock.attach_mock`. Patch by Karthikeyan
Singaravelan.

- bpo-38136: Changes AsyncMock call count and await count to be two
different counters. Now await count only counts when a coroutine has been
awaited, not when it has been called, and vice-versa. Update the
documentation around this.

- bpo-37555: Fix `NonCallableMock._call_matcher` returning tuple instead
of `_Call` object when `self._spec_signature` exists. Patch by Elizabeth
Uselton

- bpo-37251: Remove `__code__` check in AsyncMock that incorrectly
evaluated function specs as async objects but failed to evaluate classes
with `__await__` but no `__code__` attribute defined as async objects.

- bpo-38669: Raise :exc:`TypeError` when passing target as a string with
:meth:`unittest.mock.patch.object`.

- bpo-25597: Ensure, if ``wraps`` is supplied to
:class:`unittest.mock.MagicMock`, it is used to calculate return values
for the magic methods instead of using the default return values. Patch by
Karthikeyan Singaravelan.

- bpo-38108: Any synchronous magic methods on an AsyncMock now return a
MagicMock. Any asynchronous magic methods on a MagicMock now return an
AsyncMock.

- bpo-21478: Record calls to parent when autospecced object is attached
to a mock using :func:`unittest.mock.attach_mock`. Patch by Karthikeyan
Singaravelan.

- bpo-38857: AsyncMock fix for return values that are awaitable types.
This also covers side_effect iterable values that happend to be awaitable,
and wraps callables that return an awaitable type. Before these awaitables
were being awaited instead of being returned as is.

- bpo-38932: Mock fully resets child objects on reset_mock(). Patch by
Vegard Stikbakke

- bpo-37685: Fixed ``__eq__``, ``__lt__`` etc implementations in some
classes. They now return :data:`NotImplemented` for unsupported type of
the other operand. This allows the other operand to play role (for example
the equality comparison with :data:`~unittest.mock.ANY` will return
``True``).

- bpo-37212: :func:`unittest.mock.call` now preserves the order of
keyword arguments in repr output. Patch by Karthikeyan Singaravelan.

- bpo-37828: Fix default mock name in
:meth:`unittest.mock.Mock.assert_called` exceptions. Patch by Abraham
Toriz Cruz.

- bpo-36871: Improve error handling for the assert_has_calls and
assert_has_awaits methods of mocks. Fixed a bug where any errors
encountered while binding the expected calls to the mock's spec were
silently swallowed, leading to misleading error output.

- bpo-21600: Fix :func:`mock.patch.stopall` to stop active patches that
were created with :func:`mock.patch.dict`.

- bpo-38161: Removes _AwaitEvent from AsyncMock.

- bpo-36871: Ensure method signature is used instead of constructor
signature of a class while asserting mock object against method calls.
Patch by Karthikeyan Singaravelan.

-----

- bpo-31855: :func:`unittest.mock.mock_open` results now respects the
argument of read([size]). Patch contributed by Rémi Lapeyre.

-----

- Include the license, readme and changelog in the source distribution.

-----

- Fixed patching of dictionaries, when specifying the target with a
unicode on Python 2.

-----

- Add missing ``funcsigs`` dependency on Python 2.

-----

- Fix packaging issue where ``six`` was missed as a dependency.

-----

- bpo-35226: Recursively check arguments when testing for equality of
:class:`unittest.mock.call` objects and add note that tracking of
parameters used to create ancestors of mocks in ``mock_calls`` is not
possible.

- bpo-31177: Fix bug that prevented using :meth:`reset_mock
<unittest.mock.Mock.reset_mock>` on mock instances with deleted attributes

- bpo-26704: Added test demonstrating double-patching of an instance
method.  Patch by Anthony Sottile.

- bpo-35500: Write expected and actual call parameters on separate lines
in :meth:`unittest.mock.Mock.assert_called_with` assertion errors.
Contributed by Susan Su.

- bpo-35330: When a :class:`Mock` instance was used to wrap an object, if
`side_effect` is used in one of the mocks of it methods, don't call the
original implementation and return the result of using the side effect the
same way that it is done with return_value.

- bpo-30541: Add new function to seal a mock and prevent the
automatically creation of child mocks. Patch by Mario Corchero.

- bpo-35022: :class:`unittest.mock.MagicMock` now supports the
``__fspath__`` method (from :class:`os.PathLike`).

- bpo-33516: :class:`unittest.mock.MagicMock` now supports the
``__round__`` magic method.

- bpo-35512: :func:`unittest.mock.patch.dict` used as a decorator with
string target resolves the target during function call instead of during
decorator construction. Patch by Karthikeyan Singaravelan.

- bpo-36366: Calling ``stop()`` on an unstarted or stopped
:func:`unittest.mock.patch` object will now return `None` instead of
raising :exc:`RuntimeError`, making the method idempotent. Patch
byKarthikeyan Singaravelan.

- bpo-35357: Internal attributes' names of unittest.mock._Call and
unittest.mock.MagicProxy (name, parent & from_kall) are now prefixed with
_mock_ in order to prevent clashes with widely used object attributes.
Fixed minor typo in test function name.

- bpo-20239: Allow repeated assignment deletion of
:class:`unittest.mock.Mock` attributes. Patch by Pablo Galindo.

- bpo-35082: Don't return deleted attributes when calling dir on a
:class:`unittest.mock.Mock`.

- bpo-0: Improved an error message when mock assert_has_calls fails.

- bpo-23078: Add support for :func:`classmethod` and :func:`staticmethod`
to :func:`unittest.mock.create_autospec`.  Initial patch by Felipe Ochoa.

- bpo-21478: Calls to a child function created with
:func:`unittest.mock.create_autospec` should propagate to the parent.
Patch by Karthikeyan Singaravelan.

- bpo-36598: Fix ``isinstance`` check for Mock objects with spec when the
code is executed under tracing. Patch by Karthikeyan Singaravelan.

- bpo-32933: :func:`unittest.mock.mock_open` now supports iteration over
the file contents. Patch by Tony Flury.

- bpo-21269: Add ``args`` and ``kwargs`` properties to mock call objects.
Contributed by Kumar Akshay.

- bpo-17185: Set ``__signature__`` on mock for :mod:`inspect` to get
signature. Patch by Karthikeyan Singaravelan.

- bpo-35047: ``unittest.mock`` now includes mock calls in exception
messages if ``assert_not_called``, ``assert_called_once``, or
``assert_called_once_with`` fails. Patch by Petter Strandmark.

- bpo-28380: unittest.mock Mock autospec functions now properly support
assert_called, assert_not_called, and assert_called_once.

- bpo-28735: Fixed the comparison of mock.MagickMock with mock.ANY.

- bpo-20804: The unittest.mock.sentinel attributes now preserve their
identity when they are copied or pickled.

- bpo-28961: Fix unittest.mock._Call helper: don't ignore the name parameter
anymore. Patch written by Jiajun Huang.

- bpo-26750: unittest.mock.create_autospec() now works properly for
subclasses of property() and other data descriptors.

- bpo-21271: New keyword only parameters in reset_mock call.

- bpo-26807: mock_open 'files' no longer error on readline at end of file.
Patch from Yolanda Robla.

- bpo-25195: Fix a regression in mock.MagicMock. _Call is a subclass of
tuple (changeset 3603bae63c13 only works for classes) so we need to
implement __ne__ ourselves.  Patch by Andrew Plummer.