Hacktoberfestenhancementhelp wanted
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Description
Let's add an option --fail-if-warning, which'll look over issued warnings during test execution and fail them if warning issued. This can probably be done easily by patching Python's warning method and checking if it was called.
I see 3 cases to check for warnings:
1 - When importing test modules. 2 - When running individual tests. 3 - On shutdown.
For 1 & 2, this should be easy, not sure about 3.
An important feature of this, is to allow include / exclude paths to accept / ignore warnings. Eg: if a warning came from a third party library, there's sometimes little one can do, and we should ignore it. If warning came from the code being tested, it should surface.