Discussion on: Testing Node.js + Mongoose with an in-memory database

[tperrin]

Thanks for this awsome article. But since mongodb-memory-server version 7.0.0 we can't use anymore const mongoServer = new MongoMemoryServer(); but must use instead const mongo = await MongoMemoryServer.create(); . But I didn't succeed to adapt this to your code since that make me run await at file top level so I got the error "SyntaxError: await is only valid in async function". How would do you migrate your code to version 7?

[Emma Walker]

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

let mongo: MongoMemoryServer;

/**
 * Connect to the in-memory database.
 */
export const connect = async () => {
    mongo = await MongoMemoryServer.create();
    const uri = mongo.getUri();

    const mongooseOpts = {
        useNewUrlParser: true,
        useUnifiedTopology: true,
    };

    await mongoose.connect(uri, mongooseOpts);
}

/**
 * Drop database, close the connection and stop mongod.
 */
export const closeDatabase = async () => {
    await mongoose.connection.dropDatabase();
    await mongoose.connection.close();
    await mongo.stop();
}

/**
 * Remove all the data for all db collections.
 */
export const clearDatabase = async () => {
    const collections = mongoose.connection.collections;

    for (const key in collections) {
        const collection = collections[key];
        await collection.deleteMany({});
    }
}

[tperrin]

of course, simply move MongoMemoryServer.create into the connect method, I should have find this.... Thanks a lot!

[Paula Santamaría]

Thanks Emma!