signup(req, res) {
    const username = req.body.username;
    const email = req.body.email;
    const password = req.body.password;

    if(!username ) {
      return res.status(400).send({error: "You need to fill in your username"})
    }else if(!email) {
      return res.status(400).send({error:"You need to fill in your email"})
    }else if(!password) {
      return res.status(400).send({error: "You need to fill in your password"})
    }

    return User.findOne({
      where: {
        username,
      }
    })
    .then (user => {
      if(user) {
        return res.status(400).send({message: 'Username already taken'})
      }
      return User.create({
      username,
      email,
      password,
      isAdmin: req.body.isAdmin,
      })
      .then((user) =>
       {
        const token = user.generateAuthToken();
        return res.header('x-auth', token).status(201)
        .send({
          message: `Welcome ${user.username}`,
          user
        });
      })
    .catch((error) => { return res.status(400).send(`${error.errors[0].message}`)})
  })

describe('Users API test', function () {
  var user1 = {
    username: 'chair',
    email: "chair@example.com",
    password: "chairman",
    isAdmin: true
  }
  describe("It should create a user", function() {
    it('POST /api/users/signup', function(done) {
      request(app)
    .post('/api/users/signup')
    .send(user1)
    .end(function(err, res) {
      expect(res.statusCode).to.equal(201);
      expect(res.body.username).to.equal('chair')
      done()
    })
    })
  })
})

POST /api/users/signup 201 1694.701 ms - 183
      1) POST /api/users/signup
Executing (default): DROP TABLE IF EXISTS "Books" CASCADE;


  0 passing (2s)
  1 failing

  1) Users API test It should create a user POST /api/users/signup:
     Uncaught AssertionError: expected undefined to equal 'chair'
      at Test.<anonymous> (servertestsapp.test.js:39:36)
      at Test.assert (node_modulessupertestlibtest.js:179:6)
      at Server.assert (node_modulessupertestlibtest.js:131:12)
      at emitCloseNT (net.js:1552:8)
      at _combinedTickCallback (internal/process/next_tick.js:77:11)
      at process._tickCallback (internal/process/next_tick.js:104:9)



npm ERR! Test failed.  See above for more details.
[nodemon] app crashed - waiting for file changes before starting...