Mockito, testing, nulls and exceptions

[eyalroth]

@morgen-peschke

I’m very interested in this particular interaction, as Mockito is the most common source of NPEs I have to deal with

And usually with Mockito it means that a mock was invoked with the wrong arguments. It’s a more permissive way of testing; the restrictive way is to throw a particular exception when a mock is invoked with the wrong arguments instead of returning null. In any case, it usually doesn’t mean that the tested code is expected handle nulls.