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When JUnit 5 tests leave temporary directories behind, the problem can be traced to annotation placement, file locks, or parallel execution. This guide walks through diagnosing the issue, checking the test setup, and applying fixes that ensure clean‑up after each test.
Learn how JUnit Jupiter’s @TempDir annotation automatically creates and cleans up temporary directories, eliminating manual cleanup and improving test reliability.
Problem Statement JUnit 5.7+ introduces the @TempDir annotation for automatic creation of temporary directories in test methods. The Javadoc states that directories are deleted after test execution, but the exact moment of deletion is not guaranteed to be immediate. This uncertainty can lead to memory or file‑handle leaks, especially when tests spawn long‑ru
junit
java