public function testNotCorrectSignup()
 {
     $model = new SignupForm(['username' => 'troy.becker', 'email' => '*****@*****.**', 'password' => 'some_password']);
     expect_not($model->signup());
     expect_that($model->getErrors('username'));
     expect_that($model->getErrors('email'));
     expect($model->getFirstError('username'))->equals('This username has already been taken.');
     expect($model->getFirstError('email'))->equals('This email address has already been taken.');
 }