Testfixtures

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- Fixed bugs where using :attr:`not_there` to ensure a key or attribute was not there
but would be set by a test would result in the test attribute or key being left behind.

- Add support for comparing :func:`~functools.partial` instances and fix comparison of
functions and other objects where ``vars()`` returns an empty :class:`dict`.

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- Add the ability to ignore attributes of particular object types when using
:func:`compare`.

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- Fix bug when :func:`compare` was used with objects that had ``__slots__`` inherited from a
base class but where their ``__slots__`` was an empty sequence.

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- Fix bug when :func:`compare` was used with objects that had ``__slots__`` inherited from a
base class.

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- Experimental support for making assertions about events logged with Twisted's logging framework.

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- Fix problems on Python 2 when the rolling backport of `mock`__ was not installed.

__ https://mock.readthedocs.io