javascript - jest mockgoose - jest 在测试运行完成后一秒钟没有退出

Question

我有一个 Mongoose 模型:

var mongoose = require("mongoose");

var transactionSchema = mongoose.Schema({
  category: { type: String, required: [true, "Category is required."] },
  amount: Number,
  comment: String,
  tags: Array,
  currency: String
});

var Transaction = mongoose.model("Transaction", transactionSchema);

module.exports = Transaction;

以及使用 mockgoose 和 jest 的简单单元测试:

var { Mockgoose } = require("mockgoose");
var mongoose = require("mongoose");
var Transaction = require("./transaction");

var mockgoose = new Mockgoose(mongoose);

describe("transaction", function() {
  afterEach(function() {
    mockgoose.helper.reset().then(() => {
      done();
    });
  });

  it("category is required", function() {
    mockgoose.prepareStorage().then(() => {
      mongoose.connect("mongodb://foobar/baz");
      mongoose.connection.on("connected", () => {
        var mockTransaction = new Transaction({
          category: "Transportation",
          amount: 25,
          comment: "Gas money, Petrol.",
          tags: ["Gas", "Car", "Transport"],
          currency: "EUR"
        });
        mockTransaction.save(function(err, savedTransaction) {
          if (err) return console.error(err);
          expect(savedTransaction).toEqual(mockTransaction);
        });
      });
    });
  });
});

现在当我运行我的测试时，我收到了这两个警告:

(node:2199) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): ReferenceError: done is not defined (node:2199) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

然后单元测试通过，然后我得到这个错误信息:

Jest did not exit one second after the test run has completed.

This usually means that there are asynchronous operations that weren't stopped in your tests. Consider running Jest with --detectOpenHandles to troubleshoot this issue.

得到正确结果后如何终止测试？

Answer 1

错误的意思正是它所说的，done 未定义但已使用。如果使用 promise ，则不需要它。 Jest 支持 promise ，应从 block 中返回 promise 以便正确处理:

afterEach(() => mockgoose.helper.reset());

如果打开句柄出现问题，如 this question , Mongoose 可以显式断开连接:

afterAll(() => mongoose.disconnect());