jestjs - 测试成功完成后开 Jest 不会终止

Question

我正在与 jest 一起工作& supertest测试我的 api 端点并且测试通过没有问题；然而 jest永远不会退出我通常会看到的在 X 时间内完成的语句。我查看以确保 --watch标志没有被使用，它没有被使用。似乎与服务器的连接永无止境，所以 jest不知道下一步是什么。 UserFactory.generate()使用 faker 创建虚假用户数据图书馆。

我在尝试解决这个问题时不知所措。我遵循了 jest 上推荐的策略的帮助页面没有运气，并且也在问题跟踪器中进行了挖掘，但对类似问题一无所知。

这是我在运行测试套件时会看到的:



如您所见，测试运行了 7 次。我被告知所有测试都已运行，然后 morgan显示 POST那已经发生了。 jest永远不会退出，所以实际上这是失败的，因为它会在任何 CI 服务器上超时，除非手动退出。

我试过使用 .end() & done()以及 .then() & done()代替 async/await .他们都返回相同的最终结果，如果这是一个 promise Unresolved 问题 jest会因为 Unresolved promise 而出错，所以我不明白为什么这不会终止为 jest通常会。

有没有人遇到过这样的问题？

用户 Controller .test.js

import mongoose from 'mongoose';
import request from 'supertest';
import { UserFactory } from '../../__mocks__';
import { User } from '../../modules';
import { config } from '../../utils';
import app from '../../';

const mockRoute = data => request(app).post(`${config.ENDPOINT}/user/sign-up`).send(data);

describe(`POST: /user/sign-up`, () => {
  // remove any user data from db prior to running tests.
  beforeAll(async () => { await User.remove(); });
  test('Returns status 201 on success.', async () => {
    // Returns the response object: res.status === { status }
    const { status }  = await mockRoute(UserFactory.generate());
    expect(status).toEqual(201);
  });
  afterAll(async () => {
    // drop connection to the collection
    const { users } = mongoose.connection.collections;
    await users.drop();
  });
});

用户/routes.js

import { Router } from 'express';
import validate from 'express-validation';

import { signUp } from './controller';
import valid from './validation'

const routes = new Router();

/**
 * 1. Define the route: 'user/signup'.
 * 2. Validate the data being provided on the POST
 *    against valid.signUp object.
 * 3. Provide data to signUp controller method for
 *    creating a user in the database.
 */
 routes.post('/user/sign-up', validate(valid.signUp), signUp);

 export default routes;

用户/ Controller .js

import HTTPStatus from 'http-status';
import User from './model';
import { config, filterBody } from '../../utils';

export const signUp = async (req, res, next) => {
  const filteredBody = filterBody(req.body, config.WHITELIST.users.signUp);
  try {
    const user = await User.create(filteredBody);
    return res.status(HTTPStatus.CREATED).json(user.toAuthJSON());
  } catch (e) {
    e.status = HTTPStatus.BAD_REQUEST;
    return next(e);
  }
}

用户/模型.js

import mongoose, { Schema } from 'mongoose';
import uniqueValidator from 'mongoose-unique-validator';
import { hashSync, compareSync } from 'bcrypt-nodejs';
import jwt from 'jsonwebtoken';

import { config } from '../../utils';

const UserSchema = new Schema({
  email: {
    type: String,
    unique: true,
    required: [true, 'Email is required!'],
    trim: true,
    validate: {
      validator(email) {
        const emailRegex = /^[-a-z0-9%S_+]+(\.[-a-z0-9%S_+]+)*@(?:[a-z0-9-]{1,63}\.){1,125}[a-z]{2,63}$/i;
        return emailRegex.test(email);
      },
      message: '{VALUE} is not a valid email!',
    }
   },
   password: {
      type: String,
      required: [true, 'Password is required!'],
      trim: true,
      minlength: [6, 'Password need to be longer!'],
      validate: {
        validator(password) {
        return password.length >= 6 && password.match(/\d+/g);
        },
      },
  }
}, { timestamps: true })

UserSchema.plugin(uniqueValidator, {
  message: '{VALUE} already taken!',
});

UserSchema.pre('save', function(next) {
  if (this.isModified('password')) {
   this.password = this._hashPassword(this.password);
   return next();
  }
  return next();
});


UserSchema.methods = {
  authenticateUser(password) {
    return compareSync(password, this.password);
  },
  _hashPassword(password) {
    return hashSync(password);
  },
  createToken() {
    return jwt.sign({ _id: this._id }, config.JWT_SECRET);
  },
  toAuthJSON() {
    return {
      _id: this._id,
      token: `JWT ${this.createToken()}`,
    };
  },
  toJSON() {
    return {
      _id: this._id,
      username: this.username,
    };
  },
};

let User;

try {
   User = mongoose.model('User');
} catch (e) {
   User = mongoose.model('User', UserSchema);
}

export default User;

用户/validation.js

import Joi from 'joi';

export default {
   signUp: {
    body: {
      email: Joi.string().email().required(),
      password: Joi.string()
        .min(6)
        .regex(/^(?=.*[0-9])(?=.*[a-zA-Z])([a-zA-Z0-9]+)$/)
        .required(),
    },
  },
};

中间件.js

import bodyParser from 'body-parser';
import compression from 'compression';
import cors from 'cors';
import morgan from 'morgan';
import { userRoutes } from '../modules';

export default app => {
  app.use(compression());
  app.use(bodyParser.json());
  app.use(bodyParser.urlencoded({ extended: true }));
  app.use(cors());
  app.use(morgan('dev'));
  // applying api routes last.
  app.use('/api/v1', [userRoutes]);
}

索引.js

import express from 'express';
import {
  database,
  config,
  middlewares,
} from './utils';

// Create instance of Express.
const app = express();
const MODE = process.env.NODE_ENV;

// Apply middlewares to Express.
middlewares(app);
// Connect to the environment determined database.
database(config.MONGO_URI)

app.listen(config.PORT, err => {
  if (err) { return console.error(err); }
  console.log(`App running on port: ${config.PORT} in ${MODE} mode.`);
});

export default app;

Answer 1

发现问题是我在 afterAll() 中做得不够钩。

我做了一个小仓库来重现这个问题并从那里解决它，这是需要做的，以便 jest可以在成功完成测试套件后退出:

afterAll(async () => {
try {
  const { todos } = mongoose.connection.collections;
  // Collection is being dropped.
  await todos.drop()
  // Connection to Mongo killed.
  await mongoose.disconnect();
  // Server connection closed.
  await server.close();
} catch (error) {
  console.log(`
    You did something wrong dummy!
    ${error}
  `);
  throw error;
}