jwt-demo-mongoose-setup.md

JWT Demo: Mongoose Setup

Now let's add dependency on mongoose library and some helper file to make it easy to write test cases with MongoDB.

Install NPM package

npm install mongoose

npm install mongoose-unique-validator

npm install -D mongodb-memory-server

npm install -D mongoose-fixture-loader

mongoose-unique-validator helps us to specify that some fields in Mongoose schema should contain unique values.

mongodb-memory-server spins up a actual/real MongoDB Server programmatically from node for testing. This package on first start downloads the latest MongoDB binaries and save it to ~/.mongodb-binaries folder. So first run may take a time. All further runs will fast, because use already downloaded binaries.

mongoose-fixture-loader helps to create some test data to be used in test cases. We will see it in action in a minute.

Create a helper module to start MongoDB in memory

We are going to write some test cases that require a in-memory MongoDB instance. That can be done using the mongodb-memory-server package, but there are still some codes required to start/stop the server. We can put those codes into a file to be shared by all test cases.

Create a new folder called test_helper in the project root folder.

Then create a new file named in_memory_mongodb_setup.js with the following content:

/* eslint-disable no-console */

const MongodbMemoryServer = require("mongodb-memory-server").default;
const mongoose = require("mongoose");

mongoose.Promise = global.Promise;

// May require additional time for downloading MongoDB binaries
jasmine.DEFAULT_TIMEOUT_INTERVAL = 60000;

let mongoServer;

const setup = async () => {
  mongoServer = new MongodbMemoryServer();
  const mongoUri = await mongoServer.getConnectionString();

  const opts = { useNewUrlParser: true, useCreateIndex: true };
  await mongoose
    .connect(
      mongoUri,
      opts
    )
    .then(
      () => console.log("Mongo DB is ready."),
      error => console.error(error)
    );
};

const teardown = () => {
  mongoose.disconnect();
  mongoServer.stop();
};

module.exports = {
  setup,
  teardown
};