Dynamicaly changing behavior of mocks in Mockito

Question

Hello I would like to know, if there is any way to dynamicaly modify behaviour of mocks in Mockito.

For example I have a method count() and I would like Mockito to return a value higher by one every time I call it on mock.

Thank you.

Answer 1

Of course, for your count()-method getting an increment the Mockito-Answer is the best way.

BTW: But nevertheless remind that you can 'change' (define) the behaviour of a mocked-method in case of subsequent invocations:

when(mock.someMethod("some arg"))
.thenThrow(new RuntimeException())
.thenReturn("foo");

Here you see first invocation throws a RuntimeException, the second invocation returns the String "foo" ...

Answer 2

Yes... Create an Answer and stub it out on your mock using doAnswer().