<ul><li>Sharing state between JUnit tests can lead to unpredictable failures and hide bugs.</li><li>To fix this, isolate test state using JUnit 5's @BeforeEach annotation to set up a fresh state for each test.</li><li>It is important to use @AfterEach for cleanup tasks like closing resources.</li><li>Consider using PER_METHOD TestInstance Lifecycle to prevent state sharing and potential issues in JUnit tests.</li></ul>

This JUnit Mistake is Breaking Your Tests — Fix It Before Your Code Ships!

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