springboot-tdd

Test-driven development for Spring Boot services involves writing a failing unit test first, implementing minimal code to pass, and refactoring iteratively. This workflow validates features early using JUnit 5 and Mockito.

Testing Spring Boot controllers with MockMvc validates the web layer by simulating HTTP requests and asserting responses. This isolates controller logic without starting a full server context for rapid feedback.

Yes, Testcontainers provides realistic external dependencies like databases for Spring Boot integration testing. It spins up disposable Docker containers to validate data access rules in a true production-like environment.

JaCoCo enforces code coverage in Spring Boot unit testing by generating detailed reports on executed bytecode. It measures branch and line coverage to ensure iterative refactoring maintains test completeness.

The best way to write unit tests for isolated Spring Boot components is using JUnit 5 and Mockito. Mockito mocks external dependencies, allowing you to validate individual service logic independently.

You should avoid Mockito when validating integration points across multiple Spring Boot layers. Testing data access rules or security boundaries requires real environments like Testcontainers rather than mocked dependencies.