// scripts/check-bundle-split.test.mjs
//
// Phase 2 Plan 02-03 Task 3 — Vitest cover for the PIPE-02 verifier.
//
// The exhaustive structural assertion fires during `npm run ci` AFTER
// `npm run build` populates dist/. This Vitest file proves three smaller
// things that don't require the dist/ to exist:
//
//   1. The script file is present and non-empty.
//   2. The script parses + imports cleanly under Node ESM (no
//      module-eval-time process.exit; the CLI guard is correctly
//      wrapped so Vitest can import without termination).
//   3. The exported runCheck() returns a structured result with the
//      documented shape — ok / message / chunkNameMatch /
//      chunkContentMatch / files.
//
// The dev / CI happy-path (build → script exits 0) is exercised via the
// package.json scripts.ci chain: `npm run build && npm run check:bundle-split`.

import { describe, it, expect } from 'vitest';
import { existsSync } from 'node:fs';
import { resolve } from 'node:path';

const scriptPath = resolve(process.cwd(), 'scripts/check-bundle-split.mjs');

describe('scripts/check-bundle-split.mjs', () => {
  it('exists and is non-empty', () => {
    expect(existsSync(scriptPath)).toBe(true);
  });

  it('parses + imports without triggering process.exit (CLI guard works)', async () => {
    // If the CLI guard is broken, this `await import` would call process.exit
    // and Vitest's worker would terminate — the test would fail to report.
    const mod = await import(scriptPath);
    expect(typeof mod.runCheck).toBe('function');
  });

  it('runCheck() returns a structured result with the documented shape', async () => {
    const { runCheck } = await import(scriptPath);
    const result = runCheck();
    expect(result).toHaveProperty('ok');
    expect(result).toHaveProperty('message');
    expect(result).toHaveProperty('chunkNameMatch');
    expect(result).toHaveProperty('chunkContentMatch');
    expect(result).toHaveProperty('files');
    expect(typeof result.ok).toBe('boolean');
    expect(typeof result.message).toBe('string');
    expect(Array.isArray(result.files)).toBe(true);
  });
});