Paths: File paths (shared/, references/, ../ln-*) are relative to skills repo root. If not found at CWD, locate this SKILL.md directory and go up one level for repo root.

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-510-quality-coordinator Pass 1 (after ln-511 and ln-512)
• Code quality check passed

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: ../shared/references/risk_based_testing_guide.md

Version: 3.1.0 Last Updated: 2026-01-09