Node.js 开玩笑不'；t在回调中完成对done（）的测试

我有两个异步测试，其中一个运行良好，第二个在超时之前调用异步回调失败。实际上，我想它确实调用了

done（）

回调，但一切都继续工作

第一个（正确）如下所示：

    it('User should be verified', done => {
      const wsClient = require('socket.io-client')('http://localhost:7575/')

      function callback({ user, isNameTaken }) {
        expect(isNameTaken).toBe(false)
        expect(typeof user.id).toBe('string')
        expect(user.name).toBe('Sam')
        done()
      }

      wsClient.emit(VERIFY_USER, 'Sam', callback)
    })

第二个一个（不正确）：

第二次测试的控制台输出：

FAIL  test/integration/loggingIn.spec.js (7.398s)
● Console

console.log test/integration/loggingIn.spec.js:12
  BEFORE
console.log test/integration/loggingIn.spec.js:79
  ============ CALLBACK A =============== 2018-12-06T12:00:17.500Z
console.log test/integration/loggingIn.spec.js:69
  ============ CALLBACK B =============== 2018-12-06T12:00:17.520Z
console.log test/integration/loggingIn.spec.js:70
  { user: null, isNameTaken: true }
console.log test/integration/loggingIn.spec.js:71
  { done: { [Function: next] fail: [Function] } }
console.log test/integration/loggingIn.spec.js:75
  ============ CALLBACK B After done() =============== 2018-12-06T12:00:17.530Z

● User connection tests › Do not allow duplicate nicknames

Timeout - Async callback was not invoked within the 5000ms timeout specified by jest.setTimeout.

日志输出显示已触发回调，并且应调用

done（）

。我不知道我的考试有什么问题，或是开玩笑，或是。。。嗯，这里怎么了

---

UPD：这是存储库：

可能是因为测试完成后套接字IO没有退出。检查这个：你解决过这个问题吗？我在使用套接字时也看到了它。

FAIL  test/integration/loggingIn.spec.js (7.398s)
● Console

console.log test/integration/loggingIn.spec.js:12
  BEFORE
console.log test/integration/loggingIn.spec.js:79
  ============ CALLBACK A =============== 2018-12-06T12:00:17.500Z
console.log test/integration/loggingIn.spec.js:69
  ============ CALLBACK B =============== 2018-12-06T12:00:17.520Z
console.log test/integration/loggingIn.spec.js:70
  { user: null, isNameTaken: true }
console.log test/integration/loggingIn.spec.js:71
  { done: { [Function: next] fail: [Function] } }
console.log test/integration/loggingIn.spec.js:75
  ============ CALLBACK B After done() =============== 2018-12-06T12:00:17.530Z

● User connection tests › Do not allow duplicate nicknames

Timeout - Async callback was not invoked within the 5000ms timeout specified by jest.setTimeout.