JUnit 5 @AfterAll: One-Time Teardown for Your Tests

This post has been merged into a single, updated guide covering both @BeforeAll and @AfterAll together, verified on JUnit 6 and JUnit 5 with a runnable companion repository: JUnit @BeforeAll and @AfterAll: One-Time Setup and Teardown.

Everything that was here — the static and @TestInstance(PER_CLASS) examples, the @AfterAll versus @AfterEach comparison, and the best practices on null checks, exception handling and ordering — is preserved in the merged post, alongside new material on failing @BeforeAll methods, @TempDir and the extension Store. Please update any bookmarks or links.