在内存中使用MongoDB进行测试? [英] In-memory MongoDB for test?

问题描述

我正在使用MongoDB数据库为NodeJS应用程序编写一些集成和系统测试.我使用的测试框架是Mocha和Supertest.是否可以将MongoDB设置为内存数据库，我只能使用它进行测试，然后在测试完成后擦除所有的收藏和文档?

I am writing some integration and system tests for my NodeJS application using a MongoDB database. The test framework I use is Mocha and Supertest. Is it possible to setup MongoDB as an in-memory database which I can use to only test which then wipes away all my collections and documents when the test is done?

推荐答案

您可以使用 mongodb-memory-server .程序包将mongod二进制文件下载到您的主目录，并根据需要实例化一个新的支持内存的MondoDB实例.对于每个测试文件，您都可以启动一个新服务器，这意味着您可以并行运行它们.

You can accomplish this using mongodb-memory-server. The package downloads a mongod binary to your home directory and instantiates a new memory-backed MondoDB instance as needed. For each test file you can spin up a new server which means you can run them all parallel.

对于使用笑话和

For readers using jest and the native mongodb driver, you may find this class useful:

const { MongoClient } = require('mongodb');
const { MongoMemoryServer } = require('mongodb-memory-server');

// Extend the default timeout so MongoDB binaries can download
jest.setTimeout(60000);

// List your collection names here
const COLLECTIONS = [];

class DBManager {
  constructor() {
    this.db = null;
    this.server = new MongoMemoryServer();
    this.connection = null;
  }

  async start() {
    const url = await this.server.getConnectionString();
    this.connection = await MongoClient.connect(url, { useNewUrlParser: true });
    this.db = this.connection.db(await this.server.getDbName());
  }

  stop() {
    this.connection.close();
    return this.server.stop();
  }

  cleanup() {
    return Promise.all(COLLECTIONS.map(c => this.db.collection(c).remove({})));
  }
}

module.exports = DBManager;

然后在每个测试文件中，您可以执行以下操作:

Then in each test file you can do the following:

const dbman = new DBManager();

afterAll(() => dbman.stop());
beforeAll(() => dbman.start());
afterEach(() => dbman.cleanup());

我怀疑这种方法可能与其他测试框架相似.

I suspect this approach may be similar for other testing frameworks.

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