Home › Prompts › Claude › Generate meaningful unit tests

Generate meaningful unit tests

Tests that cover behavior, edge cases and failure modes for a function, in your framework's style.

ClaudeCodingRuleStack original

Written for Claude Sonnet 5.5 · Updated 2026-10-16

Note: Review and test before use. Provided as is, without warranty. See Terms.

Write tests for the code below using [framework, e.g. Vitest/pytest]. Cover: normal cases, boundaries, invalid input, error paths, and one property-style test if useful. Follow the style of this existing test: <example>[paste a test]</example>. Don't test private implementation details. List any behavior that seems like a bug instead of writing a test that locks it in.
<code>[paste code]</code>

Replace everything in [square brackets] with your own details.

Settings & parameters

• claude-sonnet-5-5 for speed; Opus for complex logic

Variations

• "Write the failing test that reproduces bug [description]."

Tips

• Ask for bug flags; otherwise tests may cement wrong behavior.