springboot-tdd

Achieve 80% Spring Boot test coverage by applying a structured test-driven development workflow using JUnit 5, Mockito, MockMvc, and Testcontainers, enforced by pre-configured JaCoCo thresholds to ensure deterministic, isolated test suites.

The best way to structure Spring Boot tests is using multi-layer patterns: MockMvc for web layer tests, DataJpaTest for persistence logic, and SpringBootTest for integration tests, ensuring each suite remains isolated and deterministic.

Apply red-green-refactor to fix bugs by writing a failing JUnit 5 test that reproduces the Spring Boot defect, implementing the minimal code logic to pass the test, and then refactoring the Java backend code to eliminate fragility.

Yes, Testcontainers works with JUnit 5 to provide isolated integration testing for Spring Boot data access logic, ensuring deterministic test suites by spinning up real database environments without leaving residual state.

Spring Boot test suites fail during refactoring when coverage is inconsistent or tests are fragile, which this Skill mitigates by enforcing strict test-driven development practices across feature development, bug fixing, and refactoring tasks.

Yes, you can use Mockito to mock dependencies in JUnit 5 unit tests while using JaCoCo to enforce strict 80%+ test coverage targets, ensuring high-quality Java codebases with deterministic, isolated test results.