A testing file for the presims micro session

test.js

const chai = require('chai');
const chaiHttp = require('chai-http');
const app = require('../index');

chai.use(chaiHttp);

describe('404 and forward to error handler', function () {
    it('Should return an object', function(done) {
        chai
            .request(app)
            .get('/')
            .end((err, res) => {
                res
                    .should
                    .have
                    .status(404);

                res
                    .body
                    .should
                    .have
                    .property('errors')
                    .which
                    .has
                    .property('message', 'Not Found');

                done();
            });
    });
});

Looks fine but you could do much better by having a test case description matching exactly what you're asserting. For instance, the test case did not mention the return on an object with a message 'Not Found'.