A detailed, side-by-side comparison of JUnit 6 and TestNG: annotations, parameterized tests, test dependencies, parallel execution, assertions, Spring Boot integration, and ecosystem support. Includes real code examples for both frameworks and a decision guide.
A practical guide to AI-powered test generation for JUnit 6 projects. Covers GitHub Copilot, Diffblue Cover, and LLM prompting strategies. Includes real AI-generated test examples, a human review checklist, mutation testing validation, and a capability table for each AI tool.
A complete guide to performance testing in JUnit 6. Covers @Timeout for time bounds, assertTimeout for inline benchmarks, JMH (Java Microbenchmark Harness) setup with @Benchmark, Blackhole usage, integrating JMH results as JUnit assertions, and benchmarking Spring Boot methods.
A complete guide to mutation testing with PIT (Pitest) and JUnit 6. Covers what mutation testing is, Maven and Gradle setup, reading mutation reports, surviving mutant analysis, and how to use PIT to measure true test suite quality beyond code coverage.
A complete guide to property-based testing in JUnit 6 with jqwik. Covers @Property, @ForAll, constraint annotations, custom Arbitraries, domain-specific generators, shrinking, seed-based reproduction, and when property testing complements example-based tests.
A catalogue of the most common JUnit testing mistakes with before/after code fixes. Covers testing implementation details, missing assertion messages, swapped assertEquals arguments, @SpringBootTest misuse, tests without assertions, and unseeded random data.
A performance optimization guide for slow JUnit 6 test suites. Covers measuring bottlenecks, Spring context duplication, using wrong test type, Testcontainers restarts, sequential execution, and provides a summary table with typical time savings per optimization.
A complete guide to identifying and permanently fixing flaky JUnit 6 tests. Covers all major root causes: shared mutable state, time dependency, Thread.sleep, port conflicts, file system races, order-dependent database tests, and async timing issues — each with proven fixes.
A systematic guide to debugging JUnit 6 test failures. Covers reading error messages like a pro, running tests in isolation, diagnostic assertions, IntelliJ IDEA debug techniques, common failure patterns (NPE, shared state, wrong argument order, unnecessary stubs), and a debugging toolkit table.
A systematic playbook for migrating JUnit 4 tests to JUnit 6. Covers annotation mapping, complete before/after code for @Rule, @RunWith, parameterized tests, Mockito integration, and a phase-by-phase migration strategy using the Vintage engine for zero-downtime upgrades.