[code-quality] Need pointers on how to add test case in the test suite for the functionality I am adding.

[Ahirnish Pareek]

Hi Devs,

I am kind of confused as to how to write test case for my functionality. I
am adding the patch in typecheck.py. Is there any guide on adding new test
cases?

Thanks.

-- 
Regards,
Ahirnish
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