Allow asserting that a mock will be called within a timeout

[jfornoff]

It'd be nice to have the option to assert that a mocked function will be called in a defined timeout.

:meck.wait supports it pretty directly, should be a good fit to expect(mod) |> to(receive ...).
Maybe something like expect(mod) |> to(receive ..., within: 500)?

[antonmi]

Hi @jfornoff !
Good idea!
Thank you!