Overriding beans in Integration tests

Question

For my Spring-Boot app I provide a RestTemplate though a @Configuration file so I can add sensible defaults(ex Timeouts). For my integration tests I would like to mock the R

Answer 1

1. You can use @Primary annotation:

@Configuration
public class MockRestTemplateConfiguration {

    @Bean
    @Primary
    public RestTemplate restTemplate() {
        return Mockito.mock(RestTemplate.class)
    }
}

BTW, I wrote blog post about faking Spring bean

2. But I would suggest to take a look at Spring RestTemplate testing support. This would be simple example:

  private MockRestServiceServer mockServer;

  @Autowired
  private RestTemplate restTemplate;

  @Autowired
  private UsersClient usersClient;

  @BeforeMethod
  public void init() {
    mockServer = MockRestServiceServer.createServer(restTemplate);
  }

  @Test
  public void testSingleGet() throws Exception {
    // GIVEN
    int testingIdentifier = 0;
    mockServer.expect(requestTo(USERS_URL + "/" + testingIdentifier))
      .andExpect(method(HttpMethod.GET))
      .andRespond(withSuccess(TEST_RECORD0, MediaType.APPLICATION_JSON));


    // WHEN
    User user = usersClient.getUser(testingIdentifier);

    // THEN
    mockServer.verify();
    assertEquals(user.getName(), USER0_NAME);
    assertEquals(user.getEmail(), USER0_EMAIL);
  }

More examples can be found in my Github repo here