Here's what I've finally settled on. We must use @SpringBootTest to load in the test properties (application-test.yaml) and get the @Value(..), but that unfortunately causes the whole application to run. To block out the real objects being used, and substitute mock objects instead, we can use @SpringBootTest with @Import(SomeConfiguration.class) as follows. This will make the mock object get picked up on running the @SpringBootTest test:
@SpringBootTest @Import(value = {MockAppServiceConfiguration.class, MockEmailServiceConfiguration.class}) // etc. any other mocked objects public class MyTest { }
example of a Mock Service Configuration:
public class MockEmailServiceConfiguration { // Replace with mock EmailService when running full-application @SpringBootTest tests @Bean public EmailService emailService(){ return new EmailService() { //... Override any service methods with a mock result (no real processing) }
Now you can run the test without getting real objects wired. But since we still need to unit-test the actual service class, I manually create my own Service object and do Mockito's testing on it with openMocks / @Mock / @InjectMocks). Here's Part 2 for testing the actual Service class:
@SpringBootTest @Import(value = {MockAr11ApplicationServiceConfiguration.class, /* Prevent the loading of the real Ar11ApplicationService during @SpringBootTest's full-application launch */ MockEmailServiceConfiguration.class}) /* Prevent the loading of the real EmailService during @SpringBootTest's full-application launch */ @ExtendWith(MockitoExtension.class) public class Ar11ApplicationServiceTest { // Custom object to be constructed for unit testing, includes DAO sub-object via InjectMocks @InjectMocks Ar11ApplicationServiceImpl ar11ApplicationServiceImpl; // Custom DAO sub-object to be constructed for this unit test via Mock @Mock private Ar11ApplicationDAO ar11ApplicationDAO; @BeforeEach void setUp() throws Exception { // Manually construct/wire my own custom objects for unit testing ar11ApplicationServiceImpl = new Ar11ApplicationServiceImpl(); ar11ApplicationDAO = new Ar11ApplicationDAO(); ar11ApplicationServiceImpl.setAr11ApplicationDAO(ar11ApplicationDAO); MockitoAnnotations.openMocks(this); // Set up mock behaviors for the DAO sub-object with when/then when(ar11ApplicationDAO.method(filename)).thenReturn(..) doNothing().when(ar11ApplicationDAO).voidMethod(params);
