A simple login Authentication test

auth.test.js

import chai from 'chai-http';
import requestAgent from 'supertest';
import server from './server';

// Destructuring our expect file from chai
const { expect } = chai;

// Our various custom messages that have been abstracted.
import {
  LOGIN_ERROR_MSG,
  LOGIN_SUCCESSFUL_MSG,
} from '../../helpers';

// Creating a request agent server for testing.
const app = requestAgent(server);

// Our login app url
const LOGIN_URL = '/auth/v1/login';

// Our mock data
const fakeUsers = [
  { email: '', password: '' },
  { email: 'admin@gmail.com', password: 'secret' }
];

// The test
describe(`POST: Testing ${LOGIN_URL} route`, () => {
  it('should throw error if no data is passed', (done) => {
    app
      .post(LOGIN_URL)
      .send(fakeUsers[0])
      .end((err, response) => {
        expect(404);
        expect(response.body).to.have.property('err_msg');
        expect(response.body.message).to.equal(LOGIN_ERROR_MSG);
        done();
    });
    
    it('should return successful message with token if valid data is passed', (done) => {
      app
        .post(LOGIN_URL)
        .send(fakeUsers[1])
        .end((err, response) => {
          expect(200);
          expect(response.body).to.have.property('message');
          expect(response.body).to.have.property('token');
          expect(response.body.message).to.equal(LOGIN_SUCCESSFUL_MSG);
          done();
      });
    });
  });
});

Great!