Cheat Sheet

Unit Testing

@RunWith(MockitoJUnitRunner.class)
public class GradeServiceTest {


    @Mock
    private Dependency dependency;

    @InjectMocks
    private Service service;

}

1. @RunWith(MockitoJUnitRunner.class): class-level annotation where the target class can run tests.
2. @Mock: mocks a dependency.
3. @InjectMocks: creates an object and injects every mock into it.
4. @Test: method-level annotation that can run a test.

    @Test
    public void someUnitTest() {

        //1. Arrange: prepare the data needed to carry out the test.
        when(dependency.method()).thenReturn(someData); 

        //2. Act: call the method you want to test.
        Type result = service.method()

	//3. Assert: verify that the method is behaving correctly.
        assertEquals(expect, result);
        verify(mock, times(number of invokations)).method()
    }

Integration Testing

@SpringBootTest //starts up application context
@AutoConfigureMockMvc  // Configures the Mockmvc Bean
class TestClass {

    @Autowired
    private MockMvc mockMvc;

    @Test 
    public void test() throws Exception {

    // 1. Create request.

    RequestBuilder getRequest = MockMvcRequestBuilders.get("/path");
    RequestBuilder postRequest = MockMvcRequestBuilders.post("/path");

    // 2. Perform Request.

    mockMvc.perform(getRequest)

    mockMvc.perform(postRequest)
      .param(param, value)
      .param(param, value)
      .param(param, value)
      .param(param, value)

    // 3. Verify status, view, model, etc...

      .andExpect(status().isxxxSuccessful())

      .andExpect(view().name("view"))

      .andExpect(model().attributeExists("modelAttribute"));

      .andExpect(redirectedUrl("/path"));
    }


}