Prompt for Writing Unit Tests (Free Copy-Paste Prompt)

Copy-ready prompt

Write unit tests for the following [language] code using [test framework].
```
[paste code]
```
Requirements:
- Cover the happy path, edge cases, and error conditions.
- Use clear, descriptive test names.
- Include setup/teardown if needed.
- Aim for meaningful coverage, not just line coverage.
List any behaviors that are ambiguous and should be clarified.

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Why this prompt works

Tests are only useful if they cover the cases that break. This prompt explicitly targets edge and error conditions, uses your framework, and flags ambiguous behavior — producing tests that catch real regressions instead of just padding coverage numbers.

How to customize it

Name your test framework so the syntax matches your project.
Review the edge cases it picks; they reveal hidden assumptions.
Resolve any 'ambiguous behavior' notes — they're often real bugs.

Tip: replace the parts in [square brackets] with your own details before you send. The more specific you are — audience, tone, goal, constraints — the better the AI output.