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Unit Test Runner

Goal: Run unit tests for all changed files and their related test files.

Steps

  1. Get changed files

    • Run git diff --name-only --diff-filter=ACMR for all changes (staged + unstaged)
    • Filter for .js, .jsx, .ts, .tsx files
    • Display list

  2. Find test files

    • Check if file is already a test file (contains .test.)
    • For source files, find related tests: {basename}.test.{ext}
    • Exclude snapshots (.snap)
    • Collect unique test files
    • Flag any toMatchSnapshot() calls found — these are banned; note them for migration to explicit assertions or toMatchInlineSnapshot()

  3. Run tests

    • Execute yarn jest with all found test files
    • Run without coverage
    • Capture results

  4. Report & fix

    • Show pass/fail summary
    • If failures: Analyze → Fix issues → Re-run tests
    • Continue until all pass

Checklist

  • Changed files identified
  • Test files found
  • Tests executed
  • All tests pass
  • Issues fixed and re-tested if needed

Failure Actions

  1. Analyze failures → Isolate issues → Fix (implementation/mocks/tests) → Re-run → Repeat until pass

Quick Commands

yarn jest <filename>                         # Run test file
yarn jest <filename> -t "test name"          # Run specific test by name
yarn jest <filename> --no-coverage           # Faster execution (skip coverage)
yarn jest <filename> --verbose               # Detailed output for debugging

Success Criteria

All tests pass • No errors/timeouts • All changed files tested