frontend\tests\functional\SignupCest::signupWithEmptyFields PHP Method

    public function signupWithEmptyFields(FunctionalTester $I)
    {
        $I->see('Signup', 'h1');
        $I->see('Please fill out the following fields to signup:');
        $I->submitForm($this->formId, []);
        $I->seeValidationError('Username cannot be blank.');
        $I->seeValidationError('Email cannot be blank.');
        $I->seeValidationError('Password cannot be blank.');
    }