intermediate~4h
JUnit 5 Advanced Features
How to replace a dozen near-identical copy-pasted test methods with a single parameterized one, how to verify error contracts precisely with assertThrows, and how @Nested classes turn a flat, unreadable list of forty test methods into a hierarchical, behavior-driven suite organized around Given-When-Then.
Learning objectives
- Choose between @ValueSource, @CsvSource, and @MethodSource based on the shape of the test data needed
- Explain why assertThrows is more precise than JUnit 4's @Test(expected=...) at pinpointing which call fails
- Validate exception payloads (message, error code, cause chain) rather than just the exception type
- Use @Nested to organize tests into a hierarchy that mirrors an object's distinct states or behaviors
- Structure a test class using Given-When-Then naming to make behavior-driven intent explicit
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JUnit 5 Advanced Features