CodingRegression test

Write a test for a bug before fixing it

Use to lock in a bug with a failing test before you fix it.

The prompt
prompt.txt
I found a bug and want to write a regression test that fails now and passes after the fix.

The bug:
{{bug_description}}

The buggy code:
{{code}}

How to reproduce it:
{{repro}}

Test framework: {{framework}}

Write a test that:
- Reproduces the exact buggy behavior and asserts the correct expected result.
- Fails against the current code (confirm why it would fail).
- Has a clear name describing the bug it guards against.

Then show the minimal fix and confirm the test would pass.

Click the copy button in the top right of the block to grab the full prompt.

Variables

Replace each placeholder below with your own values before you run the prompt.

  • {{bug_description}}
  • {{code}}
  • {{repro}}
  • {{framework}}
Recommended models
Claude Opus 4.8GPT-5Gemini 2.5 Pro
Tags
#testing#regression#bugfix

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