[throw_m239339]

> Anyway, why do you claim any of that is specific to OOP?

There is no need for Mocks or Fakes with pure functions.

[marcosdumay]

And in what paradigm do your programs consist of only pure functions? Certainly not on FP, where IO is explicitly added to a lot of code.

Anyway, there isn't much difference between mocking a unity and passing some static data into your functions and comparing the results with the expected ones.