springboot-tdd

To implement TDD for a Spring Boot service, you structure tests first using JUnit 5 and Mockito for unit logic, MockMvc for web layers, and Testcontainers for integration tests to ensure high coverage and reliable delivery.

The best way to test Spring Boot web layer controllers is using MockMvc. It verifies request handling and controller logic deterministically without starting a full server, ensuring fast and reliable web layer tests.

You write integration tests for Spring Boot data layers using Testcontainers and DataJpaTest patterns. This approach validates persistence logic against real database instances, ensuring CI-friendly and deterministic data layer tests.

Yes, you need JaCoCo to measure Spring Boot test coverage. It enforces high test coverage by analyzing code execution during JUnit 5 and Mockito test runs, providing clear guidance on tested and untested code paths.

You keep Spring Boot integration tests fast and deterministic by using Testcontainers for isolated database environments and applying test data builders. This enforces CI-friendly practices and prevents flaky test outcomes.

Yes, you can use Mockito and JUnit 5 together for Spring Boot unit tests. Mockito validates service logic by mocking dependencies, while JUnit 5 executes the assertions, forming a fast and deterministic testing workflow.