it('Should create new user', (done) => {
    const newUserCredentials = {
      username: "testowyUzytkownik",
      password: "testoweHaslo",
      email: "testowy@email.com"
    };

    chai.request('http://localhost:8080/api/v1')
      .post('/users')
      .send(newUserCredentials)
      .then(response => {
        expect(response).to.have.status(201);
        expect(response.body.success).to.equal(true);
        expect(response.body.message).to.equal('Pomyślnie założono konto.');
        done();
      })
      .catch(done);
  });