Fail fast on duplicated parameterized entries

[kornicameister]

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Ref: https://github.com/kornicameister/loguru-mypy/pull/31#discussion_r470841984

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Idea here is to check if parametrized contains a duplicated dictionaries and if so fail fast the test. Problem though is that pytest behavior on parameterized is different...basically pytest does not seem to care if you have duplicates.

Thing to think about for a minute, I guess :)

[sobolevn]

Yes, let's do that! Each test runs for a while. And it might be helpful to find duplicates and reduce the overall time.

[kornicameister]

I can't promise when :( if someone else is willing to jump in, go ahead ;) I will happily review.