RawModule hash code issue

RawModule-test.js

const crypto = require('crypto');
const RawModule = require('./lib/RawModule');

const hashModule = (module) => {
  const hash = crypto.createHash('sha256');
  module.updateHash(hash);
  return hash.digest('hex');
};

const hashFoo = hashModule(new RawModule('foo'));
const hashBar = hashModule(new RawModule('bar'));

if (hashFoo === hashBar) {
  console.log("modules with different sources have same module hash:");
  console.log('  ', hashFoo);
  process.exit(1);
}