unit-test-controller-layer

To test Spring Boot REST controllers in isolation, use MockMvc and Mockito to mock service dependencies. This approach verifies request/response mapping, HTTP status codes, and data serialization without spinning up the entire application context.

The best way to verify HTTP status codes and JSON response bodies is by using MockMvc to perform requests against your REST controllers. It validates response mapping, headers, and data serialization independently of the service layer.

Yes, you can test exception handling for 404 Not Found or 400 Bad Request in Spring Boot REST controllers. Use MockMvc and Mockito to verify how your web layer endpoints handle and respond to these specific error conditions.

JUnit 5 works seamlessly with MockMvc and Mockito for testing Spring REST controllers. You can generate JUnit 5 tests that validate request mapping, parameter binding, and response serialization in isolation from repository dependencies.

Spring Boot controller tests fail to validate POST request input fields when MockMvc is not configured to process validation annotations. Ensure your test setup verifies input validation and returns correct HTTP status codes for invalid data.