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Post-Merge Regression Guard

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Testing

About Post-Merge Regression Guard

This event-triggered loop runs npm run test:smoke whenever a merge or rebase finishes. If the smoke tests fail, the coding agent finds the cause, fixes it and runs the suite again until it passes.

Key features

  1. 01Triggered by merge or rebase events
  2. 02Judges success by the exit code of npm run test:smoke
  3. 03Supports Cursor

Use cases

  1. 01After merging the main branch into a feature branch
  2. 02After a rebase, to confirm core flows still work
  3. 03After merging several PRs, to check the state of the trunk quickly
Goal
The smoke tests pass immediately after every merge or rebase.
Exit when
Stop when the smoke suite exits with code 0.
Between iterations run
npm run test:smoke

Launch prompt

Paste into Cursor. The agent repeats the steps below until the exit condition is met.

prompt.md
Start the "Post-Merge Regression Guard" loop.
Goal: The smoke tests pass immediately after every merge or rebase.
Step 1: Run the smoke suite — Execute npm run test:smoke. An exit code of 0 means success and the loop ends; otherwise note the failing cases and error output for the next fix. `npm run test:smoke`
Step 2: Locate and fix failures — Compare the failures with the changes brought in by the merge or rebase, apply a minimal fix, then start the next round and rerun the suite.
Between iterations run: `npm run test:smoke`
Exit when: Stop when the smoke suite exits with code 0.

Steps

Each round runs in order; if the exit condition isn’t met, another round starts, up to 1.

01
Run the smoke suite

Execute npm run test:smoke. An exit code of 0 means success and the loop ends; otherwise note the failing cases and error output for the next fix.

$npm run test:smoke
02
Locate and fix failures

Compare the failures with the changes brought in by the merge or rebase, apply a minimal fix, then start the next round and rerun the suite.

Not met → next roundExits when met

Supported agents

Coding agents that can run this loop directly.

Cursor
Claude Code

Comments

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