Planned lessonJNR-016-L04

@WebMvcTest and MockMvc

Lesson 4 of 7
Junior

On This Lesson 4 topics

In this lesson
Planned topics
Draft outline details
Practice

This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.

In this lesson

test a controller through HTTP without starting a server.

Planned topics

@WebMvcTest(ProductController.class) loads only the web layer (controller, advice, JSON), not services or repositories.
Provide the service as a mock bean (@MockitoBean in recent Spring, @MockBean in older; verify version before recording).
MockMvc sends fake requests and checks status, JSON, and headers.
Test success, validation failure (400), and not found (404), and check the body, not only the status.

Draft outline details

Demonstration

java

@WebMvcTest(ProductController.class)
class ProductControllerTest {
    @Autowired MockMvc mvc;
    @MockitoBean ProductService service;

    @Test void notFound() throws Exception {
        when(service.get(9)).thenThrow(new NotFoundException("Product", 9));
        mvc.perform(get("/products/9"))
           .andExpect(status().isNotFound())
           .andExpect(jsonPath("$.detail").value("Product 9 not found"));
    }
}

Check your understanding

What does @WebMvcTest not load?

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Services, repositories, and the rest of the app.

Practice

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