Using with MongoDB

With the Global Setup/Teardown and Async Test Environment APIs, Jest can work smoothly with MongoDB.

Use jest-mongodb Preset

Jest MongoDB provides all required configuration to run your tests using MongoDB.

First install @shelf/jest-mongodb

yarn add @shelf/jest-mongodb --dev

Specify preset in your Jest configuration:

{
 "preset": "@shelf/jest-mongodb"
}

Write your test

const {MongoClient} = require('mongodb');
 
describe('insert', () => {
 let connection;
 let db;
 
 beforeAll(async () => {
 connection = await MongoClient.connect(global.__MONGO_URI__, {
 useNewUrlParser: true,
 });
 db = await connection.db(global.__MONGO_DB_NAME__);
 });
 
 afterAll(async () => {
 await connection.close();
 await db.close();
 });
 
 it('should insert a doc into collection', async () => {
 const users = db.collection('users');
 
 const mockUser = {_id: 'some-user-id', name: 'John'};
 await users.insertOne(mockUser);
 
 const insertedUser = await users.findOne({_id: 'some-user-id'});
 expect(insertedUser).toEqual(mockUser);
 });
});

There's no need to load any dependencies.

See documentation for details (configuring MongoDB version, etc).