[issue41877] Check against misspellings of assert etc. in mock

[Václav Brožek]

Change by Václav Brožek <vabr at google.com>:


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pull_requests: +22589
pull_request: https://github.com/python/cpython/pull/23729

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41877>
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