Node.js Before块中定义的函数在Mocha中运行测试之前未完成

我正在我的节点项目中使用Mocha/Chai创建一些测试。在一个特定的测试中，我需要首先将一个文档保存到数据库中，然后检索它并对找到的文档运行一些检查

我遇到的问题是，在文档保存到数据库之前，it检查正在运行。我不明白为什么会发生这种情况，因为我正在before块中进行保存-根据Mocha文档，该块应该在同一描述块中的测试之前运行，请参见以下文档：

> With its default "BDD"-style interface, Mocha provides the hooks
> before(), after(), beforeEach(), and afterEach(). These should be used
> to set up preconditions and clean up after your tests.
> 
> describe('hooks', function() {   before(function() {
>     // runs before all tests in this block   });
> 
>   after(function() {
>     // runs after all tests in this block   });
> 
>   beforeEach(function() {
>     // runs before each test in this block   });
> 
>   afterEach(function() {
>     // runs after each test in this block   });
> 
>   // test cases });

为了澄清这一点，当我第二次运行测试和所有后续的测试时，所有检查都通过了，因为到那时它可以在数据库中找到文档

我错过了什么

这是我的密码：

const assert = require("chai").assert;
const expect = require("chai").expect;
const chai = require("chai");
chai.use(require("chai-datetime"));
const Agenda = require('agenda');

const config = require('./../../configuration');
const url = config.get('MONGO_URL');
const dbName = config.get('MONGO_DATABASE');
const collection = config.get('MONGO_COLLECTION');
const createAgendaJob = require('./../../lib/agenda-jobs/contact-firstname-to-proper-case');

const MongoClient = require('mongodb').MongoClient;
const client = new MongoClient(url);

describe("Contact FirstName to Proper Case", async function () {
  const jobName = "Contact FirstName To Proper Case";
  const testDate = new Date(2019, 01, 01);
  let result;
  let agenda;
  this.timeout(2000);
  before(async function () {
    const connectionOpts = {
      db: {
        address: `${url}/${dbName}`,
        collection
      }
    };

    agenda = new Agenda(connectionOpts);
    await new Promise(resolve => agenda.once('ready', resolve));
    await createAgendaJob(agenda); // Here is where I save the job to the DB
  });
  client.connect(async function (err) {
    assert.equal(null, err);

    const db = await client.db(dbName);

    result = await db.collection("jobs").findOne({
      "name": jobName
    });

    client.close();
  });
  it("should have a property 'name'", function () {
    expect(result).to.have.property("name");
  });
  it("should have a 'name' of 'Contact FirstName To Proper Case'", function () {
    expect(result.name).to.equal("Contact FirstName To Proper Case");
  });
  it("should have a property 'type'", function () {
    expect(result).to.have.property("type");
  });
  it("should have a 'type' of 'normal'", function () {
    expect(result.type).to.equal("normal");
  });
  it("should have a property 'repeatTimezone'", function () {
    expect(result).to.have.property("repeatTimezone");
  });
  it("should have a property 'repeatInterval'", function () {
    expect(result).to.have.property("repeatInterval");
  });
  it("should have a property 'lastModifiedBy'", function () {
    expect(result).to.have.property("lastModifiedBy");
  });
  it("should have a property 'nextRunAt'", function () {
    expect(result).to.have.property("nextRunAt");
  });
  it("should return a date for the 'nextRunAt' property", function () {
    assert.typeOf(result.nextRunAt, "date");
  });
  it("should 'nextRunAt' to be a date after test date", function () {
    expect(result.nextRunAt).to.afterDate(testDate);
  });
});

我还尝试将it检查放入后续的“描述”块中，但这也无法得到相同的结果-只有在第二次运行测试文件时才能找到文档：

const assert = require("chai").assert;
const expect = require("chai").expect;
const chai = require("chai");
chai.use(require("chai-datetime"));
const Agenda = require('agenda');

const config = require('./../../configuration');
const url = config.get('MONGO_URL');
const dbName = config.get('MONGO_DATABASE');
const collection = config.get('MONGO_COLLECTION');
const createAgendaJob = require('./../../lib/agenda-jobs/contact-firstname-to-proper-case');

const MongoClient = require('mongodb').MongoClient;
const client = new MongoClient(url);

describe("Contact FirstName to Proper Case", async function () {
  const jobName = "Contact FirstName To Proper Case";
  const testDate = new Date(2019, 01, 01);
  let result;
  let agenda;
  this.timeout(2000);
  before(async function () {
    const connectionOpts = {
      db: {
        address: `${url}/${dbName}`,
        collection
      }
    };

    agenda = new Agenda(connectionOpts);
    await new Promise(resolve => agenda.once('ready', resolve));
    await createAgendaJob(agenda); // Here is where I save the job to the DB
  });
  client.connect(async function (err) {
    assert.equal(null, err);

    const db = await client.db(dbName);

    result = await db.collection("jobs").findOne({
      "name": jobName
    });

    client.close();
  });
  describe("Check Contact FirstName To ProperCase Found Job", function () {
    it("should have a property 'name'", function () {
      expect(result).to.have.property("name");
    });
    it("should have a 'name' of 'Contact FirstName To Proper Case'", function () {
      expect(result.name).to.equal("Contact FirstName To Proper Case");
    });
    it("should have a property 'type'", function () {
      expect(result).to.have.property("type");
    });
    it("should have a 'type' of 'normal'", function () {
      expect(result.type).to.equal("normal");
    });
    it("should have a property 'repeatTimezone'", function () {
      expect(result).to.have.property("repeatTimezone");
    });
    it("should have a property 'repeatInterval'", function () {
      expect(result).to.have.property("repeatInterval");
    });
    it("should have a property 'lastModifiedBy'", function () {
      expect(result).to.have.property("lastModifiedBy");
    });
    it("should have a property 'nextRunAt'", function () {
      expect(result).to.have.property("nextRunAt");
    });
    it("should return a date for the 'nextRunAt' property", function () {
      assert.typeOf(result.nextRunAt, "date");
    });
    it("should 'nextRunAt' to be a date after test date", function () {
      expect(result.nextRunAt).to.afterDate(testDate);
    });
  });
});

它不是在完成之前运行，而是在一切之前运行：

    client.connect(async function (err) {
     ...
    });

Mocha，当创建测试时，suide运行如下代码：

调用传递的每个函数来描述

收集所有的前/后*挂钩 这就是实际调用client.connect代码段的时候！ 然后，在为每个套件创建整个套件/测试树之后

在*挂钩之前打适当的电话 调用所有its-tests，可能被before/afterAll钩子包围 追索 在您的情况下，每个钩子/测试运行至少都会等待finish，因为您正确地使用了async/await

另外，请注意，这是非常可疑的：

await setTimeout(() => {
  console.log('finished pausing for 5 seconds...');
}, 5000);

这并不等待任何事情，因为setTimeout可能会返回timer it number，而且它没有很好地定义wait应该如何处理这些数据，因为这不是承诺。 当然，它不会等待5秒钟

适当的等待如下所示：

await new Promise(resolve => setTimeout(resolve, 5000))