[issue35047] Better error messages in unittest.mock

[Petter S]

Change by Petter S <petter.strandmark at gmail.com>:


----------
pull_requests: +13628
pull_request: https://github.com/python/cpython/pull/13746

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35047>
_______________________________________