New submission from Hmvp:
When using a mock and deleting a attribute reset_mock cannot be used anymore
since it tries to call reset_mock on the _deleted sentinel value.
Reproduction path:
```
from unittest.mock import MagicMock
mock = MagicMock()
mock.a = 'test'
del mock.a
mock.reset_mock()
```
Gives:
```
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.5/unittest/mock.py", line 544, in reset_mock
child.reset_mock(visited)
AttributeError: '_SentinelObject' object has no attribute 'reset_mock'
```
Expected result:
mock is reset without throwing an exception and the 'a' attribute is no longer
in a deleted state
Only checked 3.5 and current master if bug is present
----------
components: Library (Lib)
messages: 300090
nosy: hmvp
priority: normal
severity: normal
status: open
title: unittest mock's reset_mock throws an error when an attribute has been
deleted
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue31177>
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