java-junit

Use @ParameterizedTest with a source annotation: @ValueSource for literal values, @CsvSource for inline comma-separated data, @MethodSource for a factory method returning a Stream, or @EnumSource for enum constants. Add the junit-jupiter-params dependency to your project.

Use a descriptive pattern like methodName_should_expectedBehavior_when_scenario, and add @DisplayName for human-readable labels. Follow the Arrange-Act-Assert structure and keep each test focused on a single behavior.

Annotate dependencies with @Mock and the class under test with @InjectMocks to let Mockito create and inject mocks automatically. Designing classes against interfaces makes mocking significantly easier.

Yes. Use @Tag to categorize tests, @Nested for inner-class grouping, and @TestMethodOrder with @Order when execution order is strictly necessary. Use @Disabled with a reason to temporarily skip tests.

Use assertThrows to verify that code throws an expected exception, or assertDoesNotThrow for the opposite case. Group related checks with assertAll so all assertions are evaluated before the test fails.