springboot-tdd

Spring Boot integration tests for REST APIs use MockMvc for the web layer and SpringBootTest to validate controller, service, and repository interactions. This approach ensures comprehensive coverage across all architectural layers using JUnit 5 and AssertJ assertions.

Achieving over 80% code coverage in Spring Boot requires combining unit tests, web layer tests, and integration tests. Utilizing Mockito for mocking, Testcontainers for persistence tests, and JaCoCo for reporting ensures comprehensive validation and measurable coverage metrics.

Testcontainers supports DataJpaTest persistence testing in Spring Boot by providing isolated database environments. This combination validates repository layer interactions against real databases without compromising test reliability or requiring manual database management.

Spring Boot test-driven development integrates natively with both Maven and Gradle for CI pipelines. It executes test commands and generates JaCoCo code coverage reports seamlessly within either build tool's ecosystem.

Unit testing a Spring Boot service class uses JUnit 5 for test structure and Mockito to mock external dependencies. AssertJ provides readable assertions to verify service logic isolation and behavior.

MockMvc tests Spring Boot web layer controllers in isolation by mocking HTTP requests, while SpringBootTest validates full application context integration. Choosing between them depends on whether you need focused controller validation or end-to-end request flow verification.