A complete guide to testing microservices with JUnit 6: single-service integration tests with WireMock, consumer-driven contract tests with Spring Cloud Contract, and end-to-end tests with Docker Compose and Testcontainers. Covers async event testing and state management strategies.
A practical comparison of H2 in-memory, shared real database, and Testcontainers for database testing in JUnit 6 projects. Includes code examples for all three approaches, trade-off analysis, and a decision guide for choosing the right strategy per scenario.
A complete guide to using Testcontainers with JUnit 6 for real database integration testing. Covers PostgreSQL container setup, Spring Boot @DynamicPropertySource integration, singleton pattern for performance, multi-service containers, and CI/CD pipeline compatibility.
A complete guide to using Mockito with JUnit 6: @Mock, @Spy, @InjectMocks, @Captor, stubbing with when/thenReturn, argument matchers, verifying interactions, ArgumentCaptor, InOrder verification, and best practices for effective test isolation.
A complete guide to testing REST APIs with JUnit 6 using both MockMvc and WebTestClient. Covers GET, POST, PUT, DELETE testing, JSON path assertions, validation error testing, file uploads, authentication, and a matcher quick-reference table.
A complete guide to testing Spring Boot applications with JUnit 6. Covers unit tests with plain JUnit, slice tests (@WebMvcTest, @DataJpaTest, @JsonTest), full integration tests with @SpringBootTest, context caching, Testcontainers, and best practices for each layer.
Advanced JUnit 6 extension patterns: composed meta-annotations, automatic retry extensions, soft assertions via ParameterResolver, and custom invocation strategies with @TestTemplate. Complete runnable examples showing how to build a domain-specific testing framework.
A step-by-step guide to building a complete, runnable custom JUnit 6 TestEngine from scratch. Covers TestDescriptor trees, the discovery and execution phases, ServiceLoader registration, and a full CSV-based test engine example with real output.
An in-depth look at JUnit 6 internals: the two-phase discovery and execution model, the TestDescriptor tree, the EngineExecutionListener event chain, UniqueId addressing, and programmatic test plan inspection with complete runnable code examples.
A complete guide to JUnit 6 parallel test execution: enabling and configuring parallelism, class vs method level concurrency, @Execution and @ResourceLock annotations, thread pool strategies, pitfall table with fixes, and real performance benchmarks.