[issue35330] When using mock to wrap an existing object, side_effect requires return_value

[Chris Withers]

Chris Withers <chris at withers.org> added the comment:


New changeset f05df0a4b679d0acfd0b1fe6187ba2d553b37afa by Chris Withers (Mario Corchero) in branch 'master':
bpo-35330:  Don't call the wrapped object if `side_effect` is set (GH10973)
https://github.com/python/cpython/commit/f05df0a4b679d0acfd0b1fe6187ba2d553b37afa


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<https://bugs.python.org/issue35330>
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