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Add a test for autoedit anomalies #8155
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See https://linear.app/sourcegraph/issue/CODY-6178/investigate-inconsistent-behavior-in-auto-edits-feature.
Problem
We have noticed a strange behavior recently: https://sourcegraph.slack.com/archives/C05AGQYD528/p1750845105385289
We've observed that in some cases, the
insertTextandoriginalTextfields of the autoedit completion result are inconsistent. This can lead to duplicated or malformed suggestions in the editor.We suspect the issue originates from the LLM response itself, rather than from any post-processing on our end.
SolutionReproDescriptionThis PR introduces a test case designed to help us reproduce the issue more reliably. By running it repeatedly, we hope to capture examples of the faulty behavior and better understand the root cause.Initially, I've tried to run the test repeatedly. I have never managed to get the incorrect result. Then I played with the params and responses that I caught in a debug session. Based on that it seems to me that the problem is related to the bad response (not to the post-processing) issues.
Test plan
tbd