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

A very simple example is that if you have a UserService that has @Autowired jpa resposiroty UserRepository

...
class UserService{

  @Autowired
  UserRepository userRepository;
...
}

then in the test class for UserService you will do

...
class TestUserService{
  @Mock 
  UserRepository userRepository;

  @InjectMocks
  UserService userService;

...
}

@InjectMocks tells the framework that take the @Mock UserRepository userRespository; and inject that into userService so rather than auto wiring a real instance of UserRepository a Mock of UserRepository will be injected in userService.