UserController Test using supertest, mocha, and jest's matchers.

UserController.spec.js

const request = require('supertest');
const expect = require('expect');

describe('User Controller', () => {
  var user;

  before(async () => {
    await Users.create({
      username: 'testuser1',
      password: 'testuser1',
      email: '[email protected]'
    });

    user = await LoginServiceAPIv2.passwordLogin({
      username: 'testuser1',
      password: 'testuser1'
    });
  });

  describe('POST /api/users', () => {
    it('should return an error message because the email field is empty', async () => {
      return request(sails.hooks.http.app)
        .post('/api/users')
        .set('Authorization', `Bearer ${user.token}`)
        .send({
          username: 'testuser1',
          password: 'testuser2'
        })
        .expect(400)
        .then(res => {
          expect(res.body).toContainAllKeys(['email']);
          expect(res.body).not.toContainKeys(['username', 'password']);
        });
    });

    it('should return an error message because the "password" field is empty', async () => {
      return request(sails.hooks.http.app)
        .post('/api/users')
        .set('Authorization', `Bearer ${user.token}`)
        .send({
          username: 'testuser2',
          email: '[email protected]'
        })
        .expect(400)
        .then(res => {
          expect(res.body).toContainAllKeys(['password']);
          expect(res.body).not.toContainKey('username');
        });
    });

    it('should return an error message because the "username" is invalid', async () => {
      return request(sails.hooks.http.app)
        .post('/api/users')
        .set('Authorization', `Bearer ${user.token}`)
        .send({
          username: '.testuser2.',
          email: '[email protected]'
        })
        .expect(400)
        .then(res => {
          expect(res.body).toContainAllKeys(['username']);
          expect(res.body).not.toContainKey('email');
        });
    });
  });

  describe('GET /api/users', () => {
    it('the table should have a record related to "testuser1"', async () => {
      return request(sails.hooks.http.app)
        .get('/api/users')
        .set('Authorization', `Bearer ${user.token}`)
        .then(res => {
          expect(res.body).toMatchObject(expect.any(Array));
          expect(res.body).toContainEqual(
            expect.objectContaining({ username: 'testuser1' })
          );
        });
    });
  });
});