testDB.js

import mongoose from 'mongoose';
import { MongoMemoryServer } from 'mongodb-memory-server';

jasmine.DEFAULT_TIMEOUT_INTERVAL = 600000;

class TestDbHelper {
    constructor() {
        this.db = null;
        this.server = new MongoMemoryServer({
            useUnifiedTopology: true,
        });
        this.connection = null;
    }

    /**
   * Start the server and establish a connection
   */
    async start() {
        const mongoUri = await this.server.getConnectionString();
        this.connection = await mongoose.connect(mongoUri, {
            useNewUrlParser: true,
            useFindAndModify: false,
            useUnifiedTopology: true,
        });
    }

    async stop() {
        await this.connection.disconnect();
        return this.server.stop();
    }
}

export default TestDbHelper;