Patcher's __exit__() is now never called if its __enter__() is failed.
Returning true from __exit__() silences now the exception.

Backports: 4b222c9491d1700e9bdd98e6889b8d0ea1c7321e
Signed-off-by: Chris Withers <chris@simplistix.co.uk>

…magic methods in MagicMock" (GH-19734)

* Revert "bpo-25597: Ensure wraps' return value is used for magic methods in MagicMock (#16029)"

This reverts commit 72b1004657e60c900e4cd031b2635b587f4b280e.

Backports: 521c8d6806adf0305c158d280ec00cca48e8ab22
Signed-off-by: Chris Withers <chris@simplistix.co.uk>

Currently, a Mock object which is not unsafe will raise an
AttributeError if an attribute with the prefix assert or assret is
accessed on it. This protects against misspellings of real assert
method calls, which lead to tests passing silently even if the tested
code does not satisfy the intended assertion.

Recently a check was done in a large code base (Google) and three
more frequent ways of misspelling assert were found causing harm:
asert, aseert, assrt. These are now added to the existing check.

Backports: 4662fa9bfe4a849fe87bfb321d8ef0956c89a772
Signed-off-by: Chris Withers <chris@simplistix.co.uk>

… call its __bool__ function (GH23613)

Check if NonCallableMock's spec_arg is not None instead of call its __bool__ function

Backports: c598a04dd29b89ad072245ddaf738badcfb41ac7
Signed-off-by: Chris Withers <chris@simplistix.co.uk>