Regression Checker

Runs the existing test suite to ensure no regressions after implementation changes.

Purpose & Scope

• Detect test framework (pytest/jest/vitest/go test/etc.) and test dirs.
• Execute full suite; capture results for Story quality gate.
• Return PASS/FAIL with counts/log excerpts; never modifies Linear or kanban.

When to Use

• Invoked by ln-500-story-quality-gate Pass 1 (after ln-501)
• Code quality check passed
• Before test planning pipeline (ln-510)

Workflow (concise)

1. Auto-discover framework and test locations from repo config/files.
2. Read

   docs/project/runbook.md

   — get exact test commands, Docker setup, environment variables. Use commands from runbook, NOT guessed commands.
3. Build appropriate test command; run with timeout (~5m); capture stdout/stderr.
4. Parse results: passed/failed counts; key failing tests.
5. Output verdict JSON (PASS or FAIL + failures list) and add Linear comment.

Critical Rules

• No selective test runs; run full suite.
• Do not fix tests or change status; only report.
• Language preservation in comment (EN/RU).

Definition of Done

• Framework detected; command executed.
• Results parsed; verdict produced with failing tests (if any).
• Linear comment posted with summary.

Reference Files

• Risk-based limits used downstream:

  ../ln-510-test-planner/references/risk_based_testing_guide.md

---

Version: 3.1.0 (Added mandatory runbook.md reading before test execution) Last Updated: 2026-01-09