الاختبارات المتقلبة والهشّة

في هذا الدرس

spot and fix tests that fail without a real bug.

الموضوعات المخطط لها

• A flaky test passes and fails on the same code. Causes: time, test order, randomness, shared data, real network, async timing.
• Control time with an injected Clock instead of LocalDate.now().
• Avoid Thread.sleep; wait for a condition (Awaitility) or make the code synchronous in tests.
• Seed or fix randomness.
• A brittle test breaks when you refactor without changing behavior: usually over-specified (too many verifies, exact strings).