Function growFile

__tests__/liveness-watchdog.test.ts:128–133

Grow `file` every 150ms for `forMs`; resolves when done.

(file: string, forMs: number)

  /** Grow `file` every 150ms for `forMs`; resolves when done. */
  function growFile(file: string, forMs: number): Promise<void> {
    return new Promise((resolve) => {
      const iv = setInterval(() => { fs.appendFileSync(file, 'x'.repeat(64)); }, 150);
      setTimeout(() => { clearInterval(iv); resolve(); }, forMs);
    });
  }

  it('does NOT kill a blocked loop while the watched files advance (slow store, not a wedge)', async () => {
    const tmp = path.join(fs.mkdtempSync(path.join(require('os').tmpdir(), 'cg-wd-')), 'db-wal');