Why prompt tests matter
One impressive answer does not prove a prompt is reliable. Fixtures let you compare prompt versions against the same inputs, scoring rules, and failure labels.
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Prompt Test Generator
Turn prompt edits into a repeatable test set instead of a taste-based debate.
Free web tool Last verified 2026-05-31 Fixture-first
What the output should include
- Fixture list and expected behavior.
- Scoring rubric and failure labels.
- Reviewer notes and retest rule.
Related guides
Frequently asked questions
Why test prompts with fixtures?
Fixtures let you compare prompt versions against the same inputs, scoring rules, and failure labels instead of judging one impressive answer.
How many fixtures should I start with?
Start with five to ten representative cases, then add edge cases, adversarial cases, and no-answer cases as failures appear.
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