Generate comprehensive unit tests with edge cases, error scenarios, and mock data for any function or class — instantly. Works with Jest, PyTest, JUnit, and more.
📋 The Prompt
Act as a senior QA engineer and test-driven development expert.
Generate comprehensive unit tests for the following code:
Language: [e.g. JavaScript / Python / Java / TypeScript / Go]
Testing framework: [e.g. Jest / PyTest / JUnit / Mocha / Vitest]
Mocking library (if any): [e.g. Jest mocks / unittest.mock / Mockito]
Code to test:
[paste your function, class, or module here]
Generate tests that cover ALL of the following:
1. Happy path tests (2-3 normal use cases)
2. Edge cases:
- Empty input / null / undefined values
- Boundary values (min, max)
- Empty arrays or objects
3. Error cases:
- Invalid data types
- Out-of-range values
- Network/async failures (if applicable)
4. Mock any external dependencies
(APIs, databases, file system calls)
For each test:
- Write a clear describe() block explaining what is being tested
- Add a comment above each test case explaining WHY this
scenario matters
- Use descriptive test names:
"should return X when Y happens"
At the end, give me:
- Test coverage estimate (%)
- Any scenarios I may have missed
- One suggestion to make this code more testable
🚀 How to Use This Prompt
Copy the prompt above and paste it into your preferred AI tool — Midjourney, DALL-E, ChatGPT, or Stable Diffusion. Replace all [bracketed placeholders] with your specific values for best results.
💡 Tips for Best Results
- Be as specific as possible when filling in the placeholders.
- Experiment with different values for varied, unique results.
- For Midjourney, add
--v 6 --ar 16:9at the end. - Run the same prompt multiple times — AI generates unique outputs each run.
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