What are some examples of using Mockito in Spring testing?

What are some examples of using Mockito in Spring testing?

Mockito is a popular mocking framework for unit tests in Java. In Spring, you can use it to mock dependencies. For example, you can mock a service in a controller test to isolate the controller's behavior.

Can you show me a code example?

Sure! Here's a simple example:

@RunWith(SpringRunner.class)
@WebMvcTest(MyController.class)
public class MyControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private MyService myService;

    @Test
    public void testGetSomething() throws Exception {
        when(myService.getSomething()).thenReturn(new MyObject());

        mockMvc.perform(get("/something"))
               .andExpect(status().isOk());
    }
}

What if I want to test a service that interacts with a repository?

You can use Mockito to mock the repository as well. Here's an example:

@RunWith(SpringRunner.class)
@SpringBootTest
public class MyServiceTest {

    @MockBean
    private MyRepository myRepository;

    @Autowired
    private MyService myService;

    @Test
    public void testServiceMethod() {
        when(myRepository.findById(1L)).thenReturn(Optional.of(new MyEntity()));
        MyEntity entity = myService.getEntity(1L);
        assertNotNull(entity);
    }
}