gstack/test/gstack-retro-metrics.test.ts

/**
 * Contract + behavior tests for bin/gstack-retro-metrics (retro
 * token-reduction wave — the inline git/awk pipelines from retro/SKILL.md
 * Steps 0.5-9 and 11, consolidated into one script).
 *
 * Three layers:
 *  1. CONTRACT — every labeled `KEY:` line the rendered retro prose
 *     interprets must be emitted (hermetic temp HOME + GSTACK_HOME, synthetic
 *     git repo fixture with pinned author AND committer dates).
 *  2. BEHAVIOR — deterministic values on the fixture: commit/type/session
 *     counts, streak anchoring, window --until, local-branch fallback,
 *     AI-trailer vs human co-author split, VERSION range, aux-file presence.
 *  3. EDGES — a 1-commit repo and a non-repo dir both survive (exit 0, no
 *     dropped lines); the skill fence shape stays pinned in the template.
 *
 * All hermetic: HOME + GSTACK_HOME point at throwaway temp dirs; the script
 * runs from the live worktree bin/ (the subject under test).
 */
import { describe, test, expect, beforeAll, afterAll } from 'bun:test';
import { execFileSync, spawnSync } from 'child_process';
import * as fs from 'fs';
import * as os from 'os';
import * as path from 'path';

const ROOT = path.resolve(import.meta.dir, '..');
const SCRIPT = path.join(ROOT, 'bin', 'gstack-retro-metrics');

let tmpHome: string;
let tmpGstackHome: string;
let repoDir: string;

function hermeticEnv(): Record<string, string> {
  return { PATH: process.env.PATH!, HOME: tmpHome, GSTACK_HOME: tmpGstackHome };
}

function runMetrics(args: string[], cwd: string = repoDir): string {
  return execFileSync(SCRIPT, args, { encoding: 'utf-8', cwd, env: hermeticEnv() });
}

/** Commit with pinned author AND committer dates (guard + --until read %ci). */
function commit(dir: string, msg: string, date: string, author?: { name: string; email: string }): void {
  const env: Record<string, string> = {
    ...hermeticEnv(),
    GIT_COMMITTER_DATE: date,
    ...(author ? { GIT_AUTHOR_NAME: author.name, GIT_AUTHOR_EMAIL: author.email } : {}),
  };
  const r = spawnSync('git', ['commit', '-m', msg, '--date', date], {
    cwd: dir, stdio: 'pipe', timeout: 10_000, env,
  });
  if (r.status !== 0) throw new Error(`fixture commit failed: ${r.stderr}`);
}

function git(dir: string, args: string[]): void {
  const r = spawnSync('git', args, { cwd: dir, stdio: 'pipe', timeout: 10_000, env: hermeticEnv() });
  if (r.status !== 0) throw new Error(`git ${args.join(' ')} failed: ${r.stderr}`);
}

function write(dir: string, file: string, content: string): void {
  fs.writeFileSync(path.join(dir, file), content);
  git(dir, ['add', file]);
}

beforeAll(() => {
  tmpHome = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-rm-home-'));
  tmpGstackHome = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-rm-gh-'));
  repoDir = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-rm-repo-'));

  git(repoDir, ['init', '-b', 'main']);
  git(repoDir, ['config', 'user.email', 'dev@example.com']);
  git(repoDir, ['config', 'user.name', 'Dev']);

  // Day 1 — one 20-minute session (2 commits) + one solo commit later.
  write(repoDir, 'app.ts', 'console.log("hello");\n');
  commit(repoDir, 'feat: initial app', '2026-03-10T09:00:00');
  write(repoDir, 'auth.ts', 'export function login() {}\n');
  commit(repoDir, 'feat: add auth (#12)', '2026-03-10T09:20:00');
  write(repoDir, 'foo.test.ts', 'test("login", () => {});\n');
  commit(repoDir, 'test(qa): add regression test', '2026-03-10T11:00:00');

  // Day 2 — 5-minute session; first commit carries an AI trailer AND a human
  // co-author trailer.
  write(repoDir, 'app.ts', '// wire auth\nimport "./auth";\nconsole.log("hello");\n');
  commit(
    repoDir,
    'fix: wire auth\n\nCo-Authored-By: Claude Opus <noreply@anthropic.com>\nCo-Authored-By: Alice Smith <alice@example.com>',
    '2026-03-11T10:00:00',
  );
  write(repoDir, 'VERSION', '1.0.0.0\n');
  commit(repoDir, 'chore: add VERSION', '2026-03-11T10:05:00');

  // Day 3 — a second author bumps VERSION (contributors=2, team streak=3).
  write(repoDir, 'VERSION', '1.1.0.0\n');
  commit(repoDir, 'chore: bump VERSION', '2026-03-12T09:30:00', { name: 'Bob', email: 'bob@example.com' });
});

afterAll(() => {
  fs.rmSync(tmpHome, { recursive: true, force: true });
  fs.rmSync(tmpGstackHome, { recursive: true, force: true });
  fs.rmSync(repoDir, { recursive: true, force: true });
});

/** Labeled keys the rendered retro prose interprets (Steps 1-11). */
const REQUIRED_KEYS = [
  'RETRO_METRICS_PROTO',
  'GUARD_REMOTE',
  'GUARD_HEAD',
  'RETRO_REF',
  'GUARD_LATEST_COMMIT',
  'WINDOW_SINCE',
  'WINDOW_UNTIL',
  'USER_NAME',
  'USER_EMAIL',
  'COMMIT',
  'COMMITS',
  'MERGE_COMMITS',
  'CONTRIBUTORS',
  'INSERTIONS',
  'DELETIONS',
  'NET_LOC',
  'TEST_INSERTIONS',
  'TEST_RATIO',
  'WEIGHTED_COMMITS',
  'ACTIVE_DAYS',
  'TEST_FILES_CHANGED',
  'SESSIONS',
  'DEEP_SESSIONS',
  'MEDIUM_SESSIONS',
  'MICRO_SESSIONS',
  'TOTAL_ACTIVE_MINUTES',
  'AVG_SESSION_MINUTES',
  'LOC_PER_SESSION_HOUR',
  'COMMIT_TYPES',
  'FIX_RATIO',
  'COMMIT_SIZE_BUCKETS',
  'HOURS',
  'PEAK_HOUR',
  'FOCUS_SCORE',
  'BIGGEST_COMMIT',
  'HOTSPOT',
  'AUTHOR',
  'AUTHOR_BIGGEST',
  'WEEK',
  'COAUTHOR',
  'AI_ASSISTED_COMMITS',
  'LOGICAL_SLOC_ADDED',
  'PRS_REFERENCED',
  'PR_REFS',
  'TEST_FILES_TOTAL',
  'REGRESSION_TEST_COMMITS',
  'REGRESSION_COMMIT',
  'VERSION_RANGE',
  'TEAM_STREAK',
  'USER_STREAK',
  'RETRO_CONTEXT',
  'GREPTILE_HISTORY',
  'REVIEW_BOT_HISTORY',
  'TODOS_FILE',
  'SKILL_USAGE_LOG',
  'EUREKA_LOG',
  'FRICTION_SOURCES',
  'FRICTION',
  'RETRO_METRICS_END',
] as const;

describe('gstack-retro-metrics contract', () => {
  test('emits every labeled key the retro prose interprets', () => {
    const out = runMetrics(['--base', 'main', '--since', '2026-03-09T00:00:00']);
    const missing = REQUIRED_KEYS.filter((k) => !new RegExp(`^${k}: `, 'm').test(out));
    expect(missing, `Script stopped emitting: ${missing.join(', ')} — the prose contract broke`).toEqual([]);
  });

  test('proto handshake is the FIRST line', () => {
    const out = runMetrics(['--base', 'main', '--since', '2026-03-09T00:00:00']);
    expect(out.split('\n')[0]).toBe('RETRO_METRICS_PROTO: 1');
  });

  test('the skill fence invokes the script with primary path + degraded fallback', () => {
    const tmpl = fs.readFileSync(path.join(ROOT, 'retro', 'SKILL.md.tmpl'), 'utf-8');
    expect(tmpl).toContain('"{{RUNTIME_ROOT}}/bin/gstack-retro-metrics"');
    expect(fs.readFileSync(path.join(ROOT, 'retro', 'SKILL.md'), 'utf-8')).toContain('$HOME/.claude/skills/gstack/bin/gstack-retro-metrics');
    expect(tmpl).toContain('".claude/skills/gstack/bin/gstack-retro-metrics"');
    expect(tmpl).toContain('--base "<default>" --since "<since>"');
    expect(tmpl).toContain(
      'RETRO_METRICS: unavailable — stale install (read the helper source for manual computation)',
    );
    // Degraded-mode prose keys off the proto handshake.
    expect(tmpl).toContain('RETRO_METRICS_PROTO: 1');
  });

  test('script is executable', () => {
    expect(fs.statSync(SCRIPT).mode & 0o111).toBeTruthy();
  });
});

describe('gstack-retro-metrics behavior', () => {
  test('deterministic aggregates on the fixture', () => {
    const out = runMetrics(['--base', 'main', '--since', '2026-03-09T00:00:00']);
    expect(out).toMatch(/^COMMITS: 6$/m);
    expect(out).toMatch(/^CONTRIBUTORS: 2$/m);
    expect(out).toMatch(/^ACTIVE_DAYS: 3$/m);
    // No origin remote: guard discloses, ref falls back to the local branch.
    expect(out).toMatch(/^GUARD_REMOTE: none$/m);
    expect(out).toMatch(/^GUARD_HEAD: main$/m);
    expect(out).toMatch(/^RETRO_REF: main$/m);
    expect(out).toMatch(/^GUARD_LATEST_COMMIT: 2026-03-12$/m);
    // Conventional-commit mix (feat 2, fix 1, test 1, chore 2).
    const types = out.match(/^COMMIT_TYPES: (.*)$/m)![1];
    expect(types).toContain('feat=2');
    expect(types).toContain('fix=1');
    expect(types).toContain('test=1');
    expect(types).toContain('chore=2');
    // Session detection: [09:00,09:20]=medium, [11:00]=micro, [10:00,10:05]=micro, [09:30]=micro.
    expect(out).toMatch(/^SESSIONS: 4$/m);
    expect(out).toMatch(/^MEDIUM_SESSIONS: 1$/m);
    expect(out).toMatch(/^MICRO_SESSIONS: 3$/m);
    expect(out).toMatch(/^DEEP_SESSIONS: 0$/m);
    expect(out).toMatch(/^TOTAL_ACTIVE_MINUTES: 25$/m);
    // Test health.
    expect(out).toMatch(/^TEST_FILES_TOTAL: 1$/m);
    expect(out).toMatch(/^TEST_FILES_CHANGED: 1$/m);
    expect(out).toMatch(/^REGRESSION_TEST_COMMITS: 1$/m);
    expect(out).toMatch(/^REGRESSION_COMMIT: \w+ test\(qa\): add regression test$/m);
    // PR refs from subjects.
    expect(out).toMatch(/^PRS_REFERENCED: 1$/m);
    expect(out).toMatch(/^PR_REFS: #12$/m);
    // AI trailer counted separately from the human co-author credit.
    expect(out).toMatch(/^AI_ASSISTED_COMMITS: 1$/m);
    expect(out).toMatch(/^COAUTHOR: \w+\|Alice Smith <alice@example\.com>$/m);
    expect(out).not.toMatch(/^COAUTHOR: .*anthropic\.com/m);
    // VERSION range across the window.
    expect(out).toMatch(/^VERSION_RANGE: v1\.0\.0\.0 → v1\.1\.0\.0$/m);
    // Streaks anchored at the newest commit date, never the wall clock.
    expect(out).toMatch(/^TEAM_STREAK: 3 days \(anchor 2026-03-12\)$/m);
    expect(out).toMatch(/^USER_STREAK: 2 days \(anchor 2026-03-11\)$/m);
    // Hour histogram carries the fixture's commit hours.
    const hours = out.match(/^HOURS: (.*)$/m)![1];
    expect(hours).toContain('09=');
    expect(hours).toContain('10=');
  });

  test('--until bounds the window (compare mode prior window)', () => {
    const out = runMetrics([
      '--base', 'main',
      '--since', '2026-03-09T00:00:00',
      '--until', '2026-03-11T00:00:00',
    ]);
    expect(out).toMatch(/^COMMITS: 3$/m);
    expect(out).toMatch(/^ACTIVE_DAYS: 1$/m);
    expect(out).toMatch(/^WINDOW_UNTIL: 2026-03-11T00:00:00$/m);
  });

  test('aux inputs report present when the files exist under GSTACK_HOME', () => {
    fs.writeFileSync(path.join(tmpGstackHome, 'greptile-history.md'), '# history\n');
    fs.writeFileSync(path.join(tmpGstackHome, 'review-bot-history.md'), '# history\n');
    fs.mkdirSync(path.join(tmpGstackHome, 'analytics'), { recursive: true });
    fs.writeFileSync(path.join(tmpGstackHome, 'analytics', 'skill-usage.jsonl'), '{}\n');
    try {
      const out = runMetrics(['--base', 'main', '--since', '2026-03-09T00:00:00']);
      expect(out).toMatch(/^GREPTILE_HISTORY: present /m);
      expect(out).toMatch(/^REVIEW_BOT_HISTORY: present /m);
      expect(out).toMatch(/^SKILL_USAGE_LOG: present /m);
      expect(out).toMatch(/^RETRO_CONTEXT: absent$/m);
      expect(out).toMatch(/^EUREKA_LOG: absent$/m);
    } finally {
      fs.rmSync(path.join(tmpGstackHome, 'greptile-history.md'), { force: true });
      fs.rmSync(path.join(tmpGstackHome, 'review-bot-history.md'), { force: true });
      fs.rmSync(path.join(tmpGstackHome, 'analytics'), { recursive: true, force: true });
    }
  });

  test('friction lines count this project only, within the window', () => {
    const slug = execFileSync(path.join(ROOT, 'bin', 'gstack-slug'), ['--get', 'SLUG'], {
      encoding: 'utf-8', cwd: repoDir, env: hermeticEnv(), timeout: 10_000,
    }).trim();
    const projects = path.join(tmpGstackHome, 'projects');
    const line = (o: Record<string, unknown>) => JSON.stringify(o) + '\n';
    fs.mkdirSync(path.join(projects, slug), { recursive: true });
    fs.mkdirSync(path.join(projects, 'other-project'), { recursive: true });
    fs.writeFileSync(
      path.join(projects, slug, 'timeline.jsonl'),
      line({ skill: 'ship', event: 'started', session: 's1', ts: '2026-03-10T12:00:00Z' }) +
        line({ skill: 'ship', event: 'completed', outcome: 'abort', session: 's1', ts: '2026-03-10T12:30:00Z' }) +
        line({ skill: 'ship', event: 'completed', outcome: 'error', ts: '2020-01-01T00:00:00Z' }),
    );
    fs.writeFileSync(
      path.join(projects, slug, 'question-log.jsonl'),
      line({ skill: 'ship', source: 'agent', session_id: 'A', question_id: 'ship-x', ts: '2026-03-10T12:10:00Z' }) +
        line({ skill: 'unknown', source: 'hook', session_id: 'claude-uuid', tool_use_id: 't1', ts: '2026-03-10T12:10:00Z' }),
    );
    fs.writeFileSync(
      path.join(projects, 'other-project', 'timeline.jsonl'),
      line({ skill: 'qa', event: 'completed', outcome: 'error', ts: '2026-03-10T12:00:00Z' }),
    );
    try {
      const untracked = runMetrics(['--base', 'main', '--since', '2026-03-09T00:00:00']);
      expect(untracked).toMatch(/^FRICTION_SOURCES: timeline=present questions=absent$/m);
      expect(untracked).toMatch(/^FRICTION: \/ship score=1 runs=1 questions=0 typed=0 errors=0 aborts=1$/m);
      execFileSync(path.join(ROOT, 'bin', 'gstack-config'), ['set', 'question_tuning', 'true'], {
        encoding: 'utf-8', cwd: repoDir, env: hermeticEnv(), timeout: 10_000,
      });
      const out = runMetrics(['--base', 'main', '--since', '2026-03-09T00:00:00']);
      expect(out).toMatch(/^FRICTION_SOURCES: timeline=present questions=present$/m);
      expect(out).toMatch(/^FRICTION: \/ship score=2 runs=1 questions=1 typed=0 errors=0 aborts=1$/m);
      expect(out).not.toMatch(/^FRICTION: \/qa /m);
      expect(out).not.toMatch(/^FRICTION: \/unknown /m);
      const prior = runMetrics(['--base', 'main', '--since', '2026-03-01T00:00:00', '--until', '2026-03-08T00:00:00']);
      expect(prior).toMatch(/^FRICTION: none$/m);
    } finally {
      fs.rmSync(projects, { recursive: true, force: true });
      fs.rmSync(path.join(tmpGstackHome, 'config.yaml'), { force: true });
    }
  });

  test('a failing bun prints FRICTION: unavailable and the script still ends ok', () => {
    const fakeBin = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-rm-fakebun-'));
    fs.writeFileSync(path.join(fakeBin, 'bun'), '#!/bin/sh\nexit 1\n', { mode: 0o755 });
    try {
      const out = execFileSync(SCRIPT, ['--base', 'main', '--since', '2026-03-09T00:00:00'], {
        encoding: 'utf-8', cwd: repoDir, env: { ...hermeticEnv(), PATH: `${fakeBin}:${process.env.PATH}` }, timeout: 30_000,
      });
      expect(out).toMatch(/^FRICTION: unavailable \(friction helper failed\)$/m);
      expect(out).toMatch(/^RETRO_METRICS_END: ok$/m);
    } finally {
      fs.rmSync(fakeBin, { recursive: true, force: true });
    }
  });

  test('zero-commit window still emits the full labeled surface', () => {
    const out = runMetrics([
      '--base', 'main',
      '--since', '2020-01-01T00:00:00',
      '--until', '2020-01-08T00:00:00',
    ]);
    expect(out).toMatch(/^COMMITS: 0$/m);
    expect(out).toMatch(/^SESSIONS: 0$/m);
    expect(out).toMatch(/^RETRO_METRICS_END: ok$/m);
  });
});

describe('gstack-retro-metrics edges', () => {
  test('survives a repo with exactly 1 commit', () => {
    const oneDir = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-rm-one-'));
    try {
      git(oneDir, ['init', '-b', 'main']);
      git(oneDir, ['config', 'user.email', 'solo@example.com']);
      git(oneDir, ['config', 'user.name', 'Solo']);
      write(oneDir, 'a.txt', 'hi\n');
      commit(oneDir, 'feat: first', '2026-03-10T09:00:00');
      const out = runMetrics(['--base', 'main', '--since', '2026-03-09T00:00:00'], oneDir);
      expect(out).toMatch(/^COMMITS: 1$/m);
      expect(out).toMatch(/^CONTRIBUTORS: 1$/m);
      expect(out).toMatch(/^SESSIONS: 1$/m);
      expect(out).toMatch(/^MICRO_SESSIONS: 1$/m);
      expect(out).toMatch(/^TEAM_STREAK: 1 days \(anchor 2026-03-10\)$/m);
      expect(out).toMatch(/^BIGGEST_COMMIT: \w+\|1\|Solo\|feat: first$/m);
      expect(out).toMatch(/^RETRO_METRICS_END: ok$/m);
    } finally {
      fs.rmSync(oneDir, { recursive: true, force: true });
    }
  });

  test('non-repo dir reports RETRO_METRICS_ERROR and exits 0', () => {
    const emptyDir = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-rm-empty-'));
    try {
      const out = runMetrics(['--since', '7 days ago'], emptyDir);
      expect(out).toContain('RETRO_METRICS_PROTO: 1');
      expect(out).toContain('RETRO_METRICS_ERROR: not inside a git repository');
    } finally {
      fs.rmSync(emptyDir, { recursive: true, force: true });
    }
  });

  test('local reads only: no network git ops or curl anywhere in the script', () => {
    const script = fs.readFileSync(SCRIPT, 'utf-8');
    expect(script).not.toMatch(/(^|[;|&`($!]|\s)git(\s+-C\s+\S+)?\s+(push|pull|fetch|clone|ls-remote)\b/m);
    expect(script).not.toMatch(/(^|[|&;(`]|\s|\$\()curl\s/);
  });
});

// G6 riders #2812, #2809, #2037: the test census only knew JS/TS-style names,
// so pytest, minitest, XCTest, Terraform and Bats suites counted as zero, while
// a committed build directory counted as authored (and test) code.
describe('gstack-retro-metrics test census beyond JS/TS', () => {
  function fixtureRepo(prefix: string, files: Record<string, string>): string {
    const dir = fs.mkdtempSync(path.join(os.tmpdir(), prefix));
    git(dir, ['init', '-b', 'main']);
    git(dir, ['config', 'user.email', 'dev@example.com']);
    git(dir, ['config', 'user.name', 'Dev']);
    for (const [rel, body] of Object.entries(files)) {
      fs.mkdirSync(path.dirname(path.join(dir, rel)), { recursive: true });
      write(dir, rel, body);
    }
    commit(dir, 'feat: suite', '2026-03-10T09:00:00');
    return dir;
  }

  test('pytest/minitest test_*.py|rb, Terraform and Bats files count; dir-homed helpers do not', () => {
    const dir = fixtureRepo('gstack-rm-py-', {
      'tests/test_login.py': 'def test_login():\n    assert True\n',
      'tests/test_signup.rb': "require 'minitest'\n",
      'tests/helper_test.rb': "require 'minitest'\n",
      'infra/main.tftest.hcl': 'run "plan" {}\n',
      'scripts/cli.bats': '@test "runs" { true; }\n',
      'tests/utils.py': 'HELPER = 1\n',
      'app/testing.py': 'MODE = 1\n',
    });
    try {
      expect(runMetrics(['--base', 'main', '--since', '2026-03-09T00:00:00'], dir)).toMatch(/^TEST_FILES_TOTAL: 5$/m);
    } finally {
      fs.rmSync(dir, { recursive: true, force: true });
    }
  });

  test('Swift/XCTest naming counts; generated output and prose specs do not', () => {
    const dir = fixtureRepo('gstack-rm-swift-', {
      'App/Store.swift': 'struct Store {}\n',
      'AppTests/StoreTests.swift': 'import XCTest\nfinal class StoreTests: XCTestCase {}\n',
      '.build/Logs/Test/manifest.plist': 'generated\ngenerated\ngenerated\n',
      'docs/specs/design.md': '# Design\nprose\nprose\n',
    });
    try {
      const out = runMetrics(['--since', '2026-03-01T00:00:00'], dir);
      expect(out).toMatch(/^TEST_FILES_TOTAL: 1$/m);
      expect(out).toMatch(/^TEST_FILES_CHANGED: 1$/m);
      expect(out).toMatch(/^TEST_INSERTIONS: 2$/m);
      // 1 production + 2 test + 3 prose lines; the 3 generated lines are dropped.
      expect(out).toMatch(/^INSERTIONS: 6$/m);
      expect(out).not.toMatch(/^FOCUS_SCORE: .*\.build/m);
    } finally {
      fs.rmSync(dir, { recursive: true, force: true });
    }
  });
});