test_ok2/changelog/3191.feature.rst

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A warning is now issued when assertions are made for ``None``.
This is a common source of confusion among new users, which write::
assert mocked_object.assert_called_with(3, 4, 5, key='value')
When they should write::
mocked_object.assert_called_with(3, 4, 5, key='value')
Because the ``assert_called_with`` method of mock objects already executes an assertion.
This warning will not be issued when ``None`` is explicitly checked. An assertion like::
assert variable is None
will not issue the warning.