Write tests that catch real bugs

Edge cases and failure modes, not just the happy path.

ChatGPTClaudeGemini

Use it when: Adding a test suite to existing code.

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Test FrameworkYour Code

Your prompt

Write [Test Framework] tests for the code below.

Cover:
- The happy path.
- Every boundary: empty, zero, one, maximum, null and unexpected type.
- Each failure mode the code can hit, including thrown errors.
- Anything asynchronous or order-dependent.

Before the code, list the cases in one line each so I can check for gaps.

---CODE---
[Your Code]
---END CODE---

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