Usages of doThrow() doAnswer() doNothing() and doReturn() in mockito

Question

I was learning mockito and I understood the basic usages of the above mentioned functions from the link.

But I would like to know whether it can be used for any othe

Answer 1

It depends on the kind of test double you want to interact with:

• If you don't use doNothing and you mock an object, the real method is not called
• If you don't use doNothing and you spy an object, the real method is called

In other words, with mocking the only useful interactions with a collaborator are the ones that you provide. By default functions will return null, void methods do nothing.