[issue28911] Clarify the behaviour of assert_called_once_with

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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nosy: +berker.peksag, michael.foord -153957
stage:  -> patch review
type: enhancement -> behavior
versions:  -Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28911>
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