[issue33667] Mock calls on mutable objects

[Pawel]

New submission from Pawel <inne.poczta at gmail.com>:

When method of mocked object is called multiple times with mutable object as parameter and attribute of this object has been updated between calls, mock_calls is only aware of the last value. I think it unexpected behaviour, that mock doesn't track value changes.
I've attached example code

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components: Tests
files: test.py
messages: 317849
nosy: pawelj
priority: normal
severity: normal
status: open
title: Mock calls on mutable objects
type: behavior
versions: Python 3.5, Python 3.6
Added file: https://bugs.python.org/file47618/test.py

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<https://bugs.python.org/issue33667>
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