Is Expectations redundant if I have Verifications in my test?

Question

I\'m confused as to the purpose of and difference between expectations and verifications. E.g.

@Tested FooServiceImpl fooService;
@Injectable FooDao fooDao;

@Te         


        

Answer 1

The purpose of Expectations is to allow a test to record expected results for mocked methods and/or constructors, as needed by the code under test.

The purpose of Verifications is to allow a test to verify expected invocations to mocked methods and/or constructors, as made by the code under test.

So, normally, a test wouldn't both record and verify the same expectation (where an "expectation" specifies a set of invocations to mocked methods/constructors that are expected to occur when the code under test is exercised).

With that in mind, the example test would look like this:

@Tested FooServiceImpl fooService;
@Injectable FooDao fooDao;

@Test
public void callsFooDaoDelete() throws Exception {
    fooService.delete(1L);

    new Verifications() {{ fooDao.delete(1L); }};
}