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

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

Thanks @mariocj89 for the explanation. I just got to the docs part about side_effect and return_value precedence. I am curious to know about the behavior as well and at least this can be added as a test as I see only around 3 tests for side_effect and there is no test for wraps behavior in this report I assume given that there were no test failures due to changing the logic.

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