[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 12b9fb603eea9298c835bae5b8742db4fa52892e by Chris Withers (Miss Islington (bot)) in branch '3.6':
bpo-35330:  Don't call the wrapped object if `side_effect` is set (GH11034)
https://github.com/python/cpython/commit/12b9fb603eea9298c835bae5b8742db4fa52892e


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