JUnit 6
Complete guide to JUnit 6 with links to all articles covering getting started, core patterns, advanced techniques, mocking, extensions, integration testing, and best practices.
JUnit
Modern Java Testing: JUnit 6 + AssertJ + Mockito 5 + Testcontainers
A practical guide to the modern Java test stack — JUnit 6 as the runner, AssertJ for fluent assertions, Mockito 5 for mocking, and Testcontainers for real infrastructure. Includes runnable examples for each and AI prompts to generate and refactor tests.
JUnit 6 Nullability: @Nullable, @NonNull and @NullMarked Explained
A practical guide to JUnit 6 nullability annotations via JSpecify: @Nullable, @NonNull, and @NullMarked. Covers what each annotation means, how they improve compile-time null safety, IDE and static analysis integration, Kotlin interop, and complete Java code examples for each annotation.
10 AI Prompts to Debug and Fix JUnit 6 Test Failures
10 AI prompts for debugging and fixing broken, flaky, and incorrectly behaving JUnit 6 tests. Each prompt is structured to provide complete failure context — stack traces, test code, production code — and diagnose root causes across assertion errors, NPEs, Mockito issues, Spring context failures, Testcontainers problems, and more.
10 AI Prompts to Optimise and Update Existing JUnit 6 Tests
10 AI prompts to optimise, update, and improve existing JUnit 6 test classes. Covers refactoring for readability, JUnit 4 migration, removing unnecessary Spring contexts, fixing brittle mocks, adding boundary tests, consolidating duplicates, restructuring with @Nested, and full quality audits.
10 AI Prompts to Generate JUnit 6 Tests for New Projects
10 ready-to-use AI prompts to generate high-quality JUnit 6 test cases for new Java projects. Each prompt is engineered for GitHub Copilot, Claude, ChatGPT, or any LLM to produce complete, annotated, production-ready tests covering unit, integration, parameterized, and exception scenarios.
JUnit 6 vs Spock vs TestNG: Best Testing Framework for Java?
A comprehensive three-way comparison of JUnit 6, Spock, and TestNG. Covers syntax, data-driven tests, mocking, Spring Boot support, parallel execution, and ecosystem. Includes the same test written in all three frameworks and a clear decision guide for which to choose.
JUnit 6 vs Mockito: Roles, Differences, and Integration
A clear explanation of the distinct roles of JUnit 6 and Mockito in Java testing. Covers what each tool does, how MockitoExtension bridges them, the division of responsibility between assertions and verification, and a complete responsibilities reference table.
JUnit 6 vs TestNG: Feature Comparison and When to Use What
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.
AI-Powered Test Generation with JUnit 6 (Future of Testing)
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.