[issue26323] Add assert_called() and assert_called_once() methods for mock objects

[Roundup Robot]

Roundup Robot added the comment:

New changeset bd75f8d34f97 by Victor Stinner in branch 'default':
Add Mock.assert_called()
https://hg.python.org/cpython/rev/bd75f8d34f97

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26323>
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