A step-by-step guide to building JUnit 6 extensions. Covers all extension interfaces: lifecycle callbacks, ParameterResolver, TestExecutionExceptionHandler, @RegisterExtension with configuration, the ExtensionContext.Store, and a complete interface reference table.
A complete guide to using @Tag in JUnit 6 to categorize tests, build test suites, filter by tag at build time using Maven and Gradle, and apply tagging strategies for fast vs slow, unit vs integration, and feature-flag-based test selection.
A complete guide to JUnit 6 dynamic tests using @TestFactory. Covers DynamicTest, DynamicContainer, real-world use cases (live data sources, file-based tests), supported return types, and key differences from @ParameterizedTest.
A complete guide to JUnit 6 parameterized tests: every argument source explained with code examples. Covers @ValueSource, @CsvSource, @CsvFileSource, @MethodSource, @EnumSource, @NullSource, @EmptySource, and custom @ArgumentsSource providers.
Learn how to use @Nested in JUnit 6 to organise tests into scenario-based inner class groups. Covers lifecycle composition, real-world patterns for REST controllers and domain services, nesting rules, and a complete ShoppingCart example with full test report output.
A comprehensive guide to JUnit 6 test naming conventions: the should-when pattern, BDD-style given-when-then, @DisplayName sentences, @DisplayNameGeneration strategies, custom generators, and a table of naming anti-patterns to avoid.
Learn how JUnit 6 Assumptions differ from Assertions, and how to use assumeTrue, assumeFalse, assumingThat, and conditional annotations like @EnabledOnOs, @EnabledOnJre, and @EnabledIfEnvironmentVariable to skip tests gracefully when preconditions are not met.
A complete reference guide to every JUnit 6 assertion method: assertEquals, assertThrows, assertAll, assertTimeout, assertIterableEquals, and more — each explained with real code examples, expected output, and when to use which.
A practical guide to writing clean, readable, and maintainable JUnit 6 tests. Covers the Arrange-Act-Assert pattern, one behaviour per test, @DisplayName, assertAll, avoiding logic in tests, and six habits that separate good tests from great ones.
A complete guide to the JUnit 6 test lifecycle: @BeforeAll, @BeforeEach, @AfterEach, @AfterAll. Includes execution order diagrams, PER_METHOD vs PER_CLASS lifecycle comparison, nested class behaviour, and real console output examples.