MockMvc로 웹 계층 테스트하기

Testing the Web Layer

@WebMvcTest

@WebMvcTest(UserController.class)
class UserControllerTest {
    @Autowired
    MockMvc mockMvc;

    @MockBean
    UserService userService;
}

MockMvc.perform

mockMvc.perform(get("/users/1"))
    .andExpect(status().isOk());

Mocking the Service

@Test
void returnsUser() throws Exception {
    when(userService.getById("1"))
        .thenReturn(new User("1", "Alice"));

    mockMvc.perform(get("/users/1"))
        .andExpect(status().isOk());
}

Asserting JSON with jsonPath

mockMvc.perform(get("/users/1"))
    .andExpect(status().isOk())
    .andExpect(jsonPath("$.name").value("Alice"))
    .andExpect(jsonPath("$.id").value("1"));

Testing POST Requests

mockMvc.perform(post("/users")
    .contentType(MediaType.APPLICATION_JSON)
    .content("{\"name\":\"Bob\"}"))
    .andExpect(status().isCreated());

Asserting Error Statuses

when(userService.getById("99"))
    .thenThrow(new NotFoundException());

mockMvc.perform(get("/users/99"))
    .andExpect(status().isNotFound());

Testing Validation

mockMvc.perform(post("/users")
    .contentType(MediaType.APPLICATION_JSON)
    .content("{\"name\":\"\"}"))
    .andExpect(status().isBadRequest());

Checking Headers

mockMvc.perform(post("/users")
    .contentType(MediaType.APPLICATION_JSON)
    .content("{\"name\":\"Bob\"}"))
    .andExpect(header().string("Location",
        "/users/2"));

Query Parameters

mockMvc.perform(get("/users")
    .param("name", "Alice"))
    .andExpect(status().isOk())
    .andExpect(jsonPath("$.length()").value(1));

Printing the Result

mockMvc.perform(get("/users/1"))
    .andDo(print())
    .andExpect(status().isOk());

Quick Check

Recap