What tools and approaches do you use for writing controller tests in your projects?

To test controllers in Java projects, the Spring Boot framework combined with the Spring MVC Test module (MockMvc) is often used. This tool allows writing integration tests that simulate HTTP requests to controllers without starting a full server.

Main approaches:

• Use @WebMvcTest to load only the web layer.
• Use MockMvc to send requests and verify responses.
• Mock the service layer with Mockito to isolate the controller.

Example of a controller test:

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

    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private MyService myService;

    @Test
    public void testGetEndpoint() throws Exception {
        when(myService.getData()).thenReturn("Hello");

        mockMvc.perform(get("/api/data"))
               .andExpect(status().isOk())
               .andExpect(content().string("Hello"));
    }
}

This approach allows quick verification of controller logic and interaction with services.