mongoose - jest 和 mongoose - jest 检测到打开的句柄

Question

所以我正在使用 jest测试我的 node.js 应用程序，测试完成得很好，但我从 jest 收到一条关于打开句柄的消息。任何见解？

jest --detectOpenHandles

通过 src/libs/user/ 测试 /user_model_test.js 通过
src/ 测试 /app_test.js 通过
源代码/库/用户/ 测试 /user_service_test.js

测试套件:3 次通过，总共 3 次测试:14 次通过，总共 14 次
快照:0 总时间:7.209 秒运行所有测试套件。

Jest 检测到以下 4 个可能保留的打开句柄
退出玩笑:

● promise

  2 | // we use a test database for testing
  3 | var mongoDB = 'mongodb://localhost/my_db_conn';
> 4 | mongoose.connect(mongoDB);
    |          ^
  5 | const User = require('../user_model');
  6 |
  7 | describe("User model test", () => {

  at NativeConnection.Object.<anonymous>.Connection.openUri (node_modules/mongoose/lib/connection.js:424:19)
  at Mongoose.Object.<anonymous>.Mongoose.connect (node_modules/mongoose/lib/index.js:208:15)
  at Object.<anonymous> (src/libs/user/__tests__/user_model_test.js:4:10)

● promise

   8 | });
   9 |
> 10 | module.exports = mongoose.model("User", UserSchema);
     |                           ^

  at Function.init (node_modules/mongoose/lib/model.js:962:16)
  at Mongoose.Object.<anonymous>.Mongoose.model (node_modules/mongoose/lib/index.js:392:11)
  at Object.<anonymous> (src/libs/user/user_model.js:10:27)
  at Object.<anonymous> (src/libs/user/__tests__/user_model_test.js:5:14)

● promise

   8 | });
   9 |
> 10 | module.exports = mongoose.model("User", UserSchema);
     |                           ^

  at Function.init (node_modules/mongoose/lib/model.js:962:16)
  at Mongoose.Object.<anonymous>.Mongoose.model (node_modules/mongoose/lib/index.js:392:11)
  at Object.<anonymous> (src/libs/user/user_model.js:10:27)
  at Object.<anonymous> (src/libs/user/index.js:1:41)

● promise

  3 | var mongoose = require('mongoose');
  4 | var mongoDB = 'mongodb://localhost/my_db_conn';
> 5 | mongoose.connect(mongoDB);
    |          ^
  6 |
  7 | describe('App test', () => {
  8 |     it('has a module', () => {

  at NativeConnection.Object.<anonymous>.Connection.openUri (node_modules/mongoose/lib/connection.js:424:19)
  at Mongoose.Object.<anonymous>.Mongoose.connect (node_modules/mongoose/lib/index.js:208:15)
  at Object.<anonymous> (src/__tests__/app_test.js:5:10)

Answer 1

它与model.init有关返回 promise 的函数。快速修复将通过 skipInit在创建模型时标记如下:
const User = mongoose.model("users", userSchema, "users", true)skipInit是这个函数的第四个参数

但在这种情况下，它不会为您的模型初始化索引，因此最好根据 process.env.NODE_ENV 设置此标志。
const skipInit = process.env.NODE_ENV === "test"
const User = mongoose.model("users", userSchema, "users", skipInit)