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test: return frozen function from common.must[Not]Call

Rodrigo Muino Tomonari requested to merge github/fork/LiviaMedeiros/test-freeze-must-call into main

I wonder if it would make sense to return frozen functions from mustCall(), mustCallAtLeast(), mustNotCall() and mustSucceed().

Pros: implicit check that functions are never mutated, with no code cost.

Cons: impossible to monkey-patch them in tests.

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