Reproduce then fix
Turn a bug into a permanent regression test.
The prompt
Write a minimal failing test that reproduces this bug and confirm it fails. Then fix the underlying cause and show the same test passing.Why it works
A reproducing test proves you understand the bug and guarantees it can’t silently return. Confirming red-then-green makes the fix verifiable rather than “looks right.”
Fill in
- Describe the buggy behavior and how to trigger it.
Follow-ups
- “Add a second test for the boundary case near where it broke.”