lab-2

Lab 2: Sliced Testing - Verifying the Web Layer

Learning Objectives

• Understand Spring Boot's test slice annotations
• Learn how to test REST controllers with @WebMvcTest
• Get comfortable with MockMvc for simulating HTTP requests
• Use @MockitoBean to replace real beans with mocks in a test slice
• Test security-protected endpoints with @WithMockUser

Hints

• Spring Boot test slices load only the required components for testing specific layers
• Use @MockitoBean to replace real beans with mocks in a test slice
• @WebMvcTest loads only web-related components (controllers, filters, etc.)
• Use MockMvc to simulate HTTP requests without starting a server
• Include @Import(SecurityConfig.class) if you need to test with security enabled

Exercises

Exercise 1: Testing Controllers with @WebMvcTest

In this exercise, you'll use @WebMvcTest to test the BookController in isolation from the rest of the application.

Tasks:

1. Open Exercise1WebMvcTest.java in the exercises package
2. Implement test methods to verify controller behavior
3. Use MockMvc to simulate HTTP requests and verify responses
4. Mock the BookService to return predetermined data

Tips:

• Use @MockitoBean to replace the real BookService with a mock
• Configure mock behavior with Mockito's when/thenReturn
• Use MockMvc's perform() method to simulate HTTP requests
• Include the Spring Security config with @Import(SecurityConfig.class)
• Use andExpect() to validate the response
• Check the solution in Solution1WebMvcTest.java