CODEWITHSUNDEEP
javaspringspring-bootmockito
app
app

Reputation: 783

spring boot integration testing mock method returns null

I wrote simple spring boot application with Controller, Service and Business classes, but while writing integration test the mock method of Service is returning null

MockMainController

@RestController
public class MockMainController {

@Autowired
private MockBusiness mockBusiness;

@GetMapping("request")
public MockOutput mockRequest() {
    return mockBusiness.businessLogic(new MockInput());

      }

  }

MockBusiness

@Service
public class MockBusiness {

@Autowired
private MockService mockService;

public MockOutput businessLogic(MockInput input) {
    return mockService.serviceLogic(input);
    }
}

MockService

@Service
public class MockService {

@Autowired
private MockUtil mockUtil;

public MockOutput serviceLogic(MockInput input) {

    mockUtil.exchange(UriComponentsBuilder.fromUriString(" "), HttpMethod.GET, HttpEntity.EMPTY,
            new ParameterizedTypeReference<MockOutput>() {
            });
    return new MockOutput();

     }

 }

I'm trying to mock the MockService bean in application context using @MockBean

MockControllerTest

@SpringBootTest
@ActiveProfiles("test")
@Profile("test")
@RunWith(SpringJUnit4ClassRunner.class)
public class MockControllerTest {

@Autowired
private MockMainController mockMainController;

@MockBean
private MockService mockService;

@Test
public void controllerTest() {
    MockOutput output = mockMainController.mockRequest();
    given(this.mockService.serviceLogic(ArgumentMatchers.any(MockInput.class)))
            .willReturn(new MockOutput("hello", "success"));
    System.out.println(output);    //null
     }

 }

In the test method I created mock service bean using @MockBean I'm not having any error here but System.out.println(output); prints null

Upvotes: 2

Views: 2892

Answers (1)

Kamil Rafałko
Kamil Rafałko

Reputation: 330

You are getting null because of wrong statements order in your test method. You first call controller method and you get what's inside default @MockBean which is in this case null. Swap statement:

MockOutput output = mockMainController.mockRequest();

with 

given(this.mockService.serviceLogic(ArgumentMatchers.any(MockInput.class)))
        .willReturn(new MockOutput("hello", "success"));

and you will get expected result.

Upvotes: 2

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