Detect missing super calls in setup and teardown

[andyw8]

From the minitest README:

If you want to extend your test using setup/teardown via a module, just make sure you ALWAYS call super.

I'd love to have a cop to check for this.

Is your feature request related to a problem? Please describe.

While debugging some intermittently test failures, I found a missing setup call.

Describe the solution you'd like

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Describe alternatives you've considered

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Additional context

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[koic]

I think this is worth mentioning in the style guide. Can you open the proposal with example code to the Minitest Style Guide?
https://github.com/rubocop-hq/minitest-style-guide

[andyw8]

rubocop/minitest-style-guide#35

[tejasbubane]

Static analysis does not know if included module contains setup and teardown methods - so I am not sure if this cop can be implemented effectively.