I found this while trying to test an async context manager. This is a critical feature to enable migrations to async code, as the impossibility to test something properly is not acceptable in many environments.

Implementing it in a way that __call__ returns an object capable of being coroutine or normal function would avoid having to implement Async specific Mocks, wouldn't it? I am not too confident, but would it be doable to have an implementation that depends on whether _is_coroutine is accessed or not?

I don't like it, but I really don't like the fact that we need to patch different all the methods depending on whether they are coroutine or not.

Obviously, having the __acall__ method would really help solving this issue.