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How to map a diff's impact and generate tests for uncovered paths with Codexqa

Get an impact report and runnable test files for the paths a change left untested.

Who it is forA developer or QA engineer preparing a PR who needs to know what else the change touches and what lacks tests.

The problemChanges reach old APIs and call chains that no existing test covers, and reviewers rarely see those paths.

The outcomeOne self-contained HTML change-impact report with a coverage verdict, plus new runnable test files for the uncovered points.

What you need first

  • One of Cursor, Claude Code, Codex, or OpenClaw installed
  • A local git repository with the branch to check (the README refers to origin/main)
  • Node.js with npx available (inferred from the npx install commands)
  • For browser replay: Playwright Chromium, as named in the README

Steps

  1. Install the change analysis skill with npx skills add openqa-cn/codexqa --skill codexqa-change-analysis.
  2. Check out the branch that contains the diff.
  3. Run the agent prompt below.
  4. Open the HTML report and review the coverage verdict and sensitive paths.
  5. Run the new test files the skill added, and confirm they are counted in the report.

Prompt for your agent

Use codexqa-change-analysis on the diff between <base-branch> and the current branch in this repo. Write one HTML change-impact report and add runnable test files for uncovered points without editing existing test files. Verify that the report lists which methods changed, the entries that reach them, and the uncovered paths.

Caveat. The README says existing test files are not edited, but the new test files still need to be run by you, and the README does not state which test runner they target.

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