Mastering Spring 5.0

Unit testing

Let's quickly write a unit test to test the preceding controller method:

    @RunWith(SpringRunner::class)    @WebMvcTest(BasicController::class)    class BasicControllerTest {      @Autowired      lateinit var mvc: MockMvc;      @Test      fun `GET welcome returns "Hello World"`() {        mvc.perform(           MockMvcRequestBuilders.get("/welcome").accept(           MediaType.APPLICATION_JSON))           .andExpect(status().isOk())           .andExpect(content().string(equalTo("Hello World")));       }      }

In the preceding unit test, we will launch up a Mock MVC instance with BasicController. A few quick things to note are as follows:

• The annotations @RunWith(SpringRunner.class) and @WebMvcTest(BasicController::class) are similar to Java, except for the class references.
• @Autowired lateinit var mvc: MockMvc ...