Run the Patch Twice: A Paired-Run Matrix to Prove an Agent's Tests Actually Observe the Change
This story is from 2026-09-14. It is preserved in the archive; the latest stories are on the live feed.
The short version: a green test run on an agent's patch is one data point, not evidence. Run the identical command against the patched tree and a reconstructed base tree, under the same fixture fingerprint, and only trust the quadrants where the two runs disagree. A single green run cannot distingu…
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- 2026-09-14 23:32 · DEV Community — AI
Run the Patch Twice: A Paired-Run Matrix to Prove an Agent's Tests Actually Observe the Change