gstack/test/pr-dependencies.test.ts

/**
 * Derived PR-lane dependencies (scripts/pr-dependencies.ts) and the
 * fail-closed full-gate list (PR_FULL_GATE_FILES): unmapped files select the
 * gate cases whose reference closure reaches them, underivable files and
 * global inputs restore the full gate, and every fallback names its fix.
 */
import { describe, expect, test } from 'bun:test';
import * as fs from 'node:fs';
import * as os from 'node:os';
import * as path from 'node:path';
import { spawnSync } from 'node:child_process';
import { deriveDependencies, derivedDependencies, referenceText } from '../scripts/pr-dependencies';
import {
  DERIVABLE_PREFIXES, PERIODIC_ONLY_PR_FILES, PR_FULL_GATE_FILES, PR_PROFILE_MAPS, formatPrCoverageSummary, selectPrProfile, unknownFileLabel,
} from '../scripts/test-pr-profile';
import { buildRunManifest, computePaidCaseSelection } from '../scripts/test-paid-shards';
import { E2E_TIERS, LLM_JUDGE_TOUCHFILES } from './helpers/touchfiles-data';
import { matchGlob } from './helpers/test-selection';

const ROOT = path.resolve(import.meta.dir, '..');
const real = derivedDependencies(PR_PROFILE_MAPS, ROOT);
const gate = Object.keys(E2E_TIERS).filter(id => E2E_TIERS[id] === 'gate');
const FIX = 'docs/TESTING_INTERNALS.md#pr-paid-lane-fallback';

function fixtureRepo(files: Record<string, string>): string {
  const root = fs.mkdtempSync(path.join(os.tmpdir(), 'pr-deps-'));
  for (const [file, text] of Object.entries(files)) {
    fs.mkdirSync(path.dirname(path.join(root, file)), { recursive: true });
    fs.writeFileSync(path.join(root, file), text);
  }
  for (const args of [['init', '-q'], ['add', '-A']]) {
    const result = spawnSync('git', args, { cwd: root, encoding: 'utf8', timeout: 10_000 });
    if (result.status !== 0) throw new Error(`git ${args[0]} failed: ${result.stderr}`);
  }
  return root;
}

describe('reference derivation on a fixture tree', () => {
  const root = fixtureRepo({
    'test/skill-e2e-alpha.test.ts': "import { help } from './helpers/alpha-helper';\nimport { other } from './skill-e2e-beta.test';\n",
    'test/skill-e2e-beta.test.ts': "export const other = 'lib/beta-only.ts';\n",
    'test/helpers/alpha-helper.ts': "import { x } from '../../lib/alpha';\n// prose about lib/commented.ts is not a reference\nexport const help = x;\n",
    'test/helpers/touchfiles-data.ts': "export const MAP = { a: ['lib/listed-only.ts'] };\n",
    'test/helpers/joined.ts': "export const p = path.join(ROOT, 'lib', 'joined.ts');\n", 'lib/joined.ts': '',
    'lib/alpha.ts': "import './../test/helpers/joined';\nexport const x = 1;\n", 'lib/beta-only.ts': '', 'lib/commented.ts': '', 'lib/listed-only.ts': '', 'lib/bin-lib.ts': '', 'lib/unused.ts': '',
    'alpha/SKILL.md.tmpl': '{{GREETING}}\nRun `gstack-tool` then open design/dist/design.\n',
    'bin/gstack-tool': "#!/bin/sh\n# mentions lib/commented.ts only in a comment\nbun run \"$ROOT/lib/bin-lib.ts\"\n",
    'scripts/build.sh': 'bun build --compile design/src/cli.ts --outfile design/dist/design\n',
    'design/src/cli.ts': "import './render';\n", 'design/src/render.ts': '',
    'scripts/resolvers/index.ts': "import { greet } from './greeting';\nexport const RESOLVERS = {\n  GREETING: greet,\n};\n",
    'scripts/resolvers/greeting.ts': "import { tone } from './tone';\nexport const greet = () => tone;\n", 'scripts/resolvers/tone.ts': 'export const tone = 1;\n',
    'hosts/acme.ts': '', 'hosts/zeta.ts': '',
    'package.json': '{"scripts":{}}\n',
  });
  const maps = { e2eTouchfiles: { alpha: ['test/skill-e2e-alpha.test.ts', 'alpha/**'], beta: ['test/skill-e2e-beta.test.ts'] }, judgeTouchfiles: {}, globalTouchfiles: [] };
  const derived = deriveDependencies(maps, root);
  const consumers = (file: string) => [...derived.e2e.get(file) ?? []].sort();

  test('imports, bin invocations, compiled binaries and template placeholders all reach their files', () => {
    expect(consumers('lib/alpha.ts')).toEqual(['alpha']);
    expect(consumers('lib/joined.ts')).toEqual(['alpha']);
    expect(consumers('bin/gstack-tool')).toEqual(['alpha']);
    expect(consumers('lib/bin-lib.ts')).toEqual(['alpha']);
    expect(consumers('design/src/render.ts')).toEqual(['alpha']);
    expect(consumers('scripts/resolvers/tone.ts')).toEqual(['alpha']);
    expect(derived.trace('alpha', 'scripts/resolvers/tone.ts')).toEqual(['alpha/SKILL.md.tmpl', 'scripts/resolvers/greeting.ts', 'scripts/resolvers/tone.ts']);
  });

  test('comments, selection data and other paid test files are not references', () => {
    expect(consumers('lib/commented.ts')).toEqual([]);
    expect(consumers('lib/listed-only.ts')).toEqual([]);
    expect(consumers('lib/beta-only.ts')).toEqual(['beta']);
    expect(consumers('lib/unused.ts')).toEqual([]);
    expect(referenceText('a.ts', '  // lib/x.ts\nconst y = "lib/z.ts"; // trailing lib/w.ts\n')).toContain('lib/z.ts');
    expect(referenceText('a.ts', '  // lib/x.ts\n')).not.toContain('lib/x.ts');
    expect(referenceText('bin/x', '# lib/x.ts\necho lib/y.ts\n')).toBe('\necho lib/y.ts\n');
    expect(referenceText('data.json', '{"a":"lib/x.ts"}')).toBe('');
  });

  test('trace names the shortest chain: a template that invokes a bin directly wins over a long import path to it', () => {
    const repo = fixtureRepo({
      'test/skill-e2e-gamma.test.ts': '', 'gamma/SKILL.md.tmpl': 'Run bin/gstack-target.\n', 'gamma/sections/a.md.tmpl': 'See lib/one.ts.\n',
      'lib/one.ts': "import './two';\n", 'lib/two.ts': "import './three';\n", 'lib/three.ts': "export const x = 'bin/gstack-target';\n",
      'bin/gstack-target': '#!/bin/sh\n', 'package.json': '{}',
    });
    const traced = deriveDependencies({ e2eTouchfiles: { gamma: ['test/skill-e2e-gamma.test.ts', 'gamma/**'] }, judgeTouchfiles: {}, globalTouchfiles: [] }, repo);
    expect(traced.trace('gamma', 'bin/gstack-target')).toEqual(['gamma/SKILL.md.tmpl', 'bin/gstack-target']);
    expect(traced.trace('gamma', 'lib/three.ts')).toEqual(['gamma/sections/a.md.tmpl', 'lib/one.ts', 'lib/two.ts', 'lib/three.ts']);
  });

  test('a host config feeds only cases whose test names the host', () => {
    const named = deriveDependencies({ ...maps, e2eTouchfiles: { ...maps.e2eTouchfiles, beta: ['test/skill-e2e-beta.test.ts'] } },
      fixtureRepo({ 'test/skill-e2e-beta.test.ts': "run({ host: 'acme' });\n", 'hosts/acme.ts': '', 'hosts/zeta.ts': '', 'scripts/build.sh': '', 'scripts/resolvers/index.ts': '', 'package.json': '{}' }));
    expect([...named.e2e.get('hosts/acme.ts') ?? []]).toEqual(['beta']);
    expect(named.e2e.get('hosts/zeta.ts')).toBeUndefined();
  });
});

describe('shebang files and import scan failures (A1-1)', () => {
  const tree = (extra: Record<string, string> = {}) => fixtureRepo({
    'test/skill-e2e-alpha.test.ts': "import '../lib/entry';\n", 'test/skill-e2e-beta.test.ts': '',
    'lib/entry.ts': '#!/usr/bin/env bun\nimport { y } from \'./typed\';\nexport const x = y;\n',
    'lib/typed.ts': 'export const y = <T,>(v: T) => v as unknown as T;\nimport \'./typed-dep\';\n', 'lib/typed-dep.ts': '',
    'alpha/SKILL.md.tmpl': 'Run `gstack-sb`.\n', 'bin/gstack-sb': '#!/usr/bin/env -S bun run\nimport { z } from \'../lib/sb-dep\';\n', 'lib/sb-dep.ts': '',
    'bin/gstack-sh': '#!/bin/sh\nimport ../lib/sh-only.ts\n', 'lib/sh-only.ts': '',
    'scripts/build.sh': '', 'scripts/resolvers/index.ts': '', 'package.json': '{}', ...extra,
  });
  const maps = { e2eTouchfiles: { alpha: ['test/skill-e2e-alpha.test.ts', 'alpha/**'], beta: ['test/skill-e2e-beta.test.ts'] }, judgeTouchfiles: {}, globalTouchfiles: [] as string[] };
  const profileMaps = { ...maps, tiers: { alpha: 'gate', beta: 'gate' } as const };
  const pick = (derived: ReturnType<typeof deriveDependencies>, changedFiles: string[]) =>
    selectPrProfile({ maps: profileMaps, profile: [], selectedE2E: [], selectedJudges: [], changedFiles, derived });

  test('a shebang .ts file, a bun-shebang extensionless bin and a .ts generic arrow are all import-scanned', () => {
    const derived = deriveDependencies(maps, tree());
    expect([...derived.e2e.get('lib/typed.ts') ?? []]).toEqual(['alpha']);
    expect([...derived.e2e.get('lib/typed-dep.ts') ?? []]).toEqual(['alpha']);
    expect([...derived.e2e.get('lib/sb-dep.ts') ?? []]).toEqual(['alpha']);
    expect(derived.e2e.get('lib/sh-only.ts')).toBeUndefined();
    expect(derived.scanErrors.size).toBe(0);
    expect(pick(derived, ['lib/sb-dep.ts'])).toMatchObject({ mode: 'dependents', e2e: ['alpha'] });
  });

  test('lib/fs-utils.ts selects the cases of bin/gstack-redact-prepush, which imports it', () => {
    const bin = gate.filter(id => real.e2e.get('bin/gstack-redact-prepush')?.has(id));
    expect(bin.length).toBeGreaterThan(0);
    const result = computePaidCaseSelection({ profile: 'pr', env: {}, changedFiles: ['lib/fs-utils.ts'], packageVersionOnly: true });
    expect(result.coverage?.mode).toBe('dependents');
    for (const id of bin) expect(result.selection.e2e, id).toContain(id);
    expect(real.scanErrors.size).toBe(0);
    expect(real.global.has('test/helpers/bootstrap-retention.ts')).toBe(true);
  });

  test('any other scan error fails closed at every site: case closures, the global walk and deleted-file referencers', () => {
    const broken = "import { from './nowhere';\n";
    const inClosure = deriveDependencies(maps, tree({ 'lib/typed-dep.ts': broken }));
    expect([...inClosure.scanErrors.keys()]).toEqual(['lib/typed-dep.ts']);
    const closed = pick(inClosure, ['lib/sb-dep.ts']);
    expect(closed).toMatchObject({ mode: 'full-fallback', e2e: ['alpha', 'beta'], unknownFiles: ['lib/sb-dep.ts'] });
    expect(closed.unknownFileLabels[0]).toMatchObject({ label: 'import scan failed' });
    expect(closed.unknownFileLabels[0]!.fix).toContain('lib/typed-dep.ts');

    const inGlobal = deriveDependencies({ ...maps, globalTouchfiles: ['lib/runner.ts'] }, tree({ 'lib/runner.ts': broken }));
    expect([...inGlobal.scanErrors.keys()]).toEqual(['lib/runner.ts']);
    expect(pick(inGlobal, ['lib/sb-dep.ts']).mode).toBe('full-fallback');

    const unreached = deriveDependencies(maps, tree({ 'lib/orphan.ts': broken }));
    expect(unreached.scanErrors.size).toBe(0);
    expect(pick(unreached, ['lib/gone.ts'])).toMatchObject({ mode: 'full-fallback', unknownFiles: ['lib/gone.ts'] });
    expect([...unreached.scanErrors.keys()]).toEqual(['lib/orphan.ts']);
  });
});

describe('safe classification (A1-2)', () => {
  test('capy/support.env derives to the bins that read it instead of restoring the full gate', () => {
    for (const bin of ['bin/gstack-install-verdict.sh', 'bin/gstack-doctor-check.sh']) {
      for (const id of real.e2e.get(bin) ?? []) expect(real.e2e.get('capy/support.env')?.has(id), `${bin} ${id}`).toBe(true);
    }
    const result = computePaidCaseSelection({ profile: 'pr', env: {}, changedFiles: ['capy/support.env'], packageVersionOnly: true });
    expect(result.coverage?.unknownFiles).toEqual([]);
    expect(result.coverage?.mode).toBe('dependents');
    expect(DERIVABLE_PREFIXES).toContain('capy/');
  });

  test('repository config read only by free lanes or GitHub stays in the PR profile', () => {
    const files = ['.github/dependabot.yml', '.osv-scanner.toml', 'setup.ps1', '.gitlab-ci.yml', '.github/ISSUE_TEMPLATE/bug_report.md', '.gstack/ship-policy.example.json', '.gstack/plain-titles.json'];
    for (const file of files) expect(real.tracked.has(file), file).toBe(true);
    const result = computePaidCaseSelection({ profile: 'pr', env: {}, changedFiles: files, packageVersionOnly: true });
    expect(result.coverage?.mode).toBe('pr');
    expect(result.selection).toEqual({ e2e: [], judges: [] });
  });

  test('a full-gate file is never labelled a real unknown dependency', () => {
    for (const file of ['.github/workflows/evals.yml', 'test-setup.ts', '.gitattributes']) {
      const result = computePaidCaseSelection({ profile: 'pr', env: {}, changedFiles: [file], packageVersionOnly: true });
      expect(result.coverage?.mode, file).toBe('full-fallback');
      for (const label of result.coverage!.unknownFileLabels) {
        expect(label.label, file).toBe('full-gate input');
        expect(label.fix).toContain('PR_FULL_GATE_FILES');
      }
      expect(unknownFileLabel(file).label).toBe('full-gate input');
    }
    expect(unknownFileLabel('SECURITY.md').label).toBe('real unknown dependency');
  });
});

describe('derived dependencies of this checkout', () => {
  test('a bin script a skill template invokes selects that skill\'s cases', () => {
    const consumers = real.e2e.get('bin/gstack-next-version') ?? new Set();
    expect(consumers.has('review-sql-injection')).toBe(true);
    expect(real.trace('review-sql-injection', 'bin/gstack-next-version')?.[0]).toBe('review/SKILL.md.tmpl');
  });

  test('a compiled design source reaches exactly the cases whose closure names the design binary', () => {
    const consumers = [...real.e2e.get('design/src/evolve.ts') ?? []];
    expect(consumers.length).toBeGreaterThan(0);
    expect(consumers.length).toBeLessThan(Object.keys(E2E_TIERS).length);
    for (const id of consumers.slice(0, 5)) expect(real.trace(id, 'design/src/evolve.ts')?.some(file => file === 'design/src/cli.ts' || file.startsWith('design/src/'))).toBe(true);
  });

  test('the paid runner\'s import closure is global, and only that', () => {
    for (const file of ['scripts/test-paid-shards.ts', 'scripts/e2e-shard-reuse.ts', 'test/helpers/session-runner.ts', 'test/helpers/eval-store.ts', 'scripts/lib/shard-engine.ts']) {
      expect(real.global.has(file), file).toBe(true);
    }
    expect(real.global.has('bin/gstack-next-version')).toBe(false);
    expect(real.global.size).toBeLessThan(120);
  });
});

describe('PR selection with derived dependencies', () => {
  const select = (changedFiles: string[]) => computePaidCaseSelection({ profile: 'pr', env: {}, changedFiles, packageVersionOnly: true });

  test('an unmapped file with derived consumers runs every dependent gate case and nothing else', () => {
    const result = select(['design/src/evolve.ts']);
    expect(result.coverage?.mode).toBe('dependents');
    const expected = gate.filter(id => real.e2e.get('design/src/evolve.ts')?.has(id)).sort();
    expect(result.selection.e2e).toEqual(expected);
    expect(result.coverage?.derivedFiles).toEqual([{ file: 'design/src/evolve.ts', e2e: real.e2e.get('design/src/evolve.ts')!.size, judges: real.judges.get('design/src/evolve.ts')?.size ?? 0 }]);
    const manifest = buildRunManifest({ tier: 'gate', profile: 'pr', sliceCount: 2, evalsAll: false, env: {}, changedFiles: ['design/src/evolve.ts'] });
    expect(manifest.prCoverage?.mode).toBe('dependents');
    expect(manifest.entries.some(entry => entry.status === 'planned')).toBe(true);
  });

  test('a tracked file no paid case reaches is exempt; periodic-only workflows never run the PR gate', () => {
    const result = select(['scripts/typecheck-test.ts', ...PERIODIC_ONLY_PR_FILES]);
    expect(result.coverage?.mode).toBe('pr');
    expect(result.coverage?.noConsumerFiles).toEqual(['scripts/typecheck-test.ts']);
    expect(result.selection).toEqual({ e2e: [], judges: [] });
  });

  test('a paid-runner import selects every case, as a global touchfile does', () => {
    const viaClosure = select(['scripts/e2e-shard-reuse.ts']);
    const viaGlobal = select(['scripts/test-paid-shards.ts']);
    expect(viaClosure.coverage?.mode).toBe('pr');
    expect(viaClosure.selection).toEqual(viaGlobal.selection);
  });

  test('derivation is skipped for fixture maps unless passed explicitly', () => {
    const result = selectPrProfile({ maps: { ...PR_PROFILE_MAPS, e2eTouchfiles: { ...PR_PROFILE_MAPS.e2eTouchfiles } }, selectedE2E: [], selectedJudges: [], changedFiles: ['design/src/evolve.ts'] });
    expect(result.mode).toBe('full-fallback');
  });
});

describe('the fail-closed full-gate list', () => {
  const tracked = [...real.tracked];

  test('every entry matches a tracked file', () => {
    const stale = PR_FULL_GATE_FILES.filter(pattern => !tracked.some(file => matchGlob(file, pattern)));
    expect(stale.map(pattern => `${pattern}: matches no tracked file. Fix: delete it from PR_FULL_GATE_FILES in scripts/test-pr-profile.ts (${FIX})`)).toEqual([]);
  });

  test('every entry restores the full gate even when a touchfile or a derived reference also names it', () => {
    for (const pattern of PR_FULL_GATE_FILES) {
      const file = tracked.find(candidate => matchGlob(candidate, pattern))!;
      const result = computePaidCaseSelection({ profile: 'pr', env: {}, changedFiles: [file], packageVersionOnly: false });
      expect({ file, mode: result.coverage?.mode }).toEqual({ file, mode: 'full-fallback' });
      expect(result.selection.e2e).toEqual(gate.sort());
    }
  });

  test('the setup, preamble, eval policy and PR workflow inputs are on it', () => {
    for (const file of ['setup', 'scripts/resolvers/preamble.ts', 'test/helpers/periodic-exclude-data.ts', '.github/workflows/evals.yml', 'bun.lock']) {
      expect(PR_FULL_GATE_FILES.some(pattern => matchGlob(file, pattern)), file).toBe(true);
    }
  });

  test('a file the derivation cannot place restores the full gate with its fix', () => {
    for (const file of ['SECURITY.md', 'conductor.json']) {
      const result = computePaidCaseSelection({ profile: 'pr', env: {}, changedFiles: [file], packageVersionOnly: true });
      expect(result.coverage?.mode, file).toBe('full-fallback');
      const label = result.coverage!.unknownFileLabels[0]!;
      expect(label.file).toBe(file);
      expect(label.fix).toContain(file);
      expect(label.fix).toContain('touchfiles-data.ts');
      expect(label.fix).toContain('DERIVABLE_PREFIXES');
    }
    expect(DERIVABLE_PREFIXES).not.toContain('test/fixtures/');
  });

});

describe('deleted files (paths absent from the head tree)', () => {
  const without = (file: string) => ({ ...real, tracked: new Set([...real.tracked].filter(other => other !== file)) });
  const pick = (file: string, derived = without(file)) => selectPrProfile({ selectedE2E: [], selectedJudges: [], changedFiles: [file], derived });

  test('a deleted file nothing references and no touchfile matches has no dependents', () => {
    const result = pick('scripts/retired-tool-nobody-calls.ts', real);
    expect(result.mode).toBe('pr');
    expect(result.noConsumerFiles).toEqual(['scripts/retired-tool-nobody-calls.ts']);
    expect(result.e2e).toEqual([]);
  });

  test('a deleted file a touchfile matches selects that touchfile\'s cases', () => {
    const result = computePaidCaseSelection({ profile: 'pr', env: {}, changedFiles: ['browse/src/retired-module.ts'], packageVersionOnly: true });
    expect(result.coverage?.unknownFiles).toEqual([]);
    expect(result.coverage?.mode).toBe('pr');
    expect(result.selection.e2e).toContain('browse-basic');
  });

  test('a deleted file live code still references selects the referencing files\' dependents', () => {
    const result = pick('bin/gstack-next-version');
    expect(result.mode).toBe('dependents');
    expect(result.e2e).toContain('review-sql-injection');
    expect(result.derivedFiles[0]?.file).toBe('bin/gstack-next-version');
    expect(real.referencers('bin/gstack-next-version')).toContain('review/SKILL.md.tmpl');
  });

  test('a file the PR adds is read from the checkout under review, not from the selector\'s own tree (an older install)', () => {
    const added = 'hosts/claude/hooks/zz-added-hook.ts';
    expect(fs.existsSync(path.join(ROOT, added))).toBe(false);
    expect(real.referencers(added)).toContain('setup');
    const checkout = fixtureRepo({ setup: 'SETUP_HOOK=hosts/claude/hooks/zz-added-hook\n', [added]: 'export {};\n' });
    try {
      const result = computePaidCaseSelection({ profile: 'pr', rootDir: checkout, env: { EVALS_BASE: 'HEAD' }, changedFiles: [added], packageVersionOnly: true });
      expect(result.coverage!.unknownFileLabels.filter(l => l.file === added)).toEqual([]);
      expect(result.reason).not.toContain('deleted but still referenced');
    } finally {
      fs.rmSync(checkout, { recursive: true, force: true });
    }
  });

  test('a deleted file a full-gate input still references, or a deleted full-gate entry, restores the full gate', () => {
    expect(real.referencers('bin/gstack-install-registry.sh')).toContain('setup');
    const referenced = pick('bin/gstack-install-registry.sh');
    expect(referenced.mode).toBe('full-fallback');
    expect(referenced.unknownFileLabels[0]).toMatchObject({ file: 'bin/gstack-install-registry.sh', label: 'deleted but still referenced' });
    expect(referenced.unknownFileLabels[0]!.fix).toContain('setup');
    expect(pick('bunfig.toml').mode).toBe('full-fallback');
  });

  test('comments and data files never count as references to a deleted path', () => {
    const root = fixtureRepo({
      'test/skill-e2e-alpha.test.ts': "// lib/gone.ts used to live here\nimport './helpers/h';\n",
      'test/helpers/h.ts': "export const data = 'x';\n", 'data/list.json': '["lib/gone.ts"]',
      'scripts/build.sh': '', 'scripts/resolvers/index.ts': '', 'package.json': '{}',
    });
    const derived = deriveDependencies({ e2eTouchfiles: { alpha: ['test/skill-e2e-alpha.test.ts'] }, judgeTouchfiles: {}, globalTouchfiles: [] }, root);
    expect(derived.referencers('lib/gone.ts')).toEqual([]);
    const relative = fixtureRepo({ 'test/skill-e2e-alpha.test.ts': "import './helpers/gone';\n", 'scripts/build.sh': '', 'scripts/resolvers/index.ts': '', 'package.json': '{}' });
    expect(deriveDependencies({ e2eTouchfiles: { alpha: ['test/skill-e2e-alpha.test.ts'] }, judgeTouchfiles: {}, globalTouchfiles: [] }, relative)
      .referencers('test/helpers/gone.ts')).toEqual(['test/skill-e2e-alpha.test.ts']);
  });
});

describe('narrow screens leave hub files to the train gate', () => {
  const plan = (changedFiles: string[], policy = 'narrow', profile: 'pr' | 'full' = 'pr') =>
    computePaidCaseSelection({ profile, env: { EVALS_SCREEN_POLICY: policy }, changedFiles, packageVersionOnly: true });
  const hub = 'lib/restamp.ts';

  test('a hub file reaches every gate case only through the derived closure', () => {
    expect(gate.every(id => real.e2e.get(hub)?.has(id))).toBe(true);
  });

  test('a hub-only diff selects no case or judge on a narrow screen and names the hub file', () => {
    const result = plan([hub]);
    expect(result.coverage?.hubFiles).toEqual([hub]);
    expect(result.coverage?.mode).toBe('pr');
    expect(result.selection).toEqual({ e2e: [], judges: [] });
    expect(plan([hub], 'broad').selection.judges).toEqual(Object.keys(LLM_JUDGE_TOUCHFILES).sort());
    expect(formatPrCoverageSummary({ profile: 'pr', selection: result.selection, prCoverage: result.coverage }).join('\n'))
      .toContain(`Left to the train gate's full census (narrow screen): \`${hub}\``);
    expect(result.reason).toContain(`train gate's full census runs them: ${hub}`);
  });

  test('a broad screen, an unset policy and the full profile keep every dependent of a hub file', () => {
    expect(computePaidCaseSelection({ profile: 'pr', env: {}, changedFiles: [hub], packageVersionOnly: true }).selection.e2e).toEqual(gate.sort());
    const broad = plan([hub], 'broad');
    expect(broad.coverage?.mode).toBe('dependents');
    expect(broad.coverage?.hubFiles).toEqual([]);
    expect(broad.selection.e2e).toEqual(gate.sort());
    expect(plan([hub], 'narrow', 'full')).toEqual(plan([hub], 'broad', 'full'));
  });

  test('a hub file beside a shared runtime input, an unknown file or a full-gate file still runs the full gate', () => {
    for (const other of ['scripts/resolvers/preamble/generate-voice-directive.ts', 'SECURITY.md', 'bun.lock']) {
      expect({ other, e2e: plan([hub, other]).selection.e2e }).toEqual({ other, e2e: gate.sort() });
    }
  });

  test('a hub file beside a direct edit keeps that edit\'s own cases', () => {
    const direct = plan(['browse/src/retired-module.ts']).selection.e2e;
    expect(direct).toContain('browse-basic');
    expect(plan([hub, 'browse/src/retired-module.ts']).selection.e2e).toEqual(direct);
  });

  test('a deleted file that still reaches every gate case is not a hub: a narrow screen keeps its dependents', () => {
    const without = { ...real, tracked: new Set([...real.tracked].filter(file => file !== hub)) };
    const result = selectPrProfile({ selectedE2E: [], selectedJudges: [], changedFiles: [hub], derived: without, screenPolicy: 'narrow' });
    expect(result.hubFiles).toEqual([]);
    expect(result.mode).toBe('dependents');
    expect(result.e2e).toEqual(gate.sort());
  });

  test('only dispatched screens default to narrow in the PR workflow; a pull_request run plans broad', () => {
    const workflow = fs.readFileSync(path.join(ROOT, '.github', 'workflows', 'evals.yml'), 'utf8');
    expect(workflow).toContain("EVALS_SCREEN_POLICY: ${{ inputs.screen_policy || (github.event_name == 'workflow_dispatch' && 'narrow') || 'broad' }}");
    expect(workflow).not.toContain("EVALS_SCREEN_POLICY: ${{ inputs.screen_policy || 'narrow' }}");
  });

  test('size-ledger baselines select only the cases that read them, none in the gate', () => {
    const result = plan(['test/size-ledger/ship/base.json']);
    expect(result.coverage?.unknownFiles).toEqual([]);
    expect(result.selection.e2e).toEqual([]);
  });
});