Respect\Validation\Rules\Email::getEmailValidator PHP Method

    public function getEmailValidator()
    {
        if (class_exists(EmailValidator::class) && !$this->emailValidator instanceof EmailValidator) {
            $this->emailValidator = new EmailValidator();
        }
        return $this->emailValidator;
    }

 public function testShouldHaveADefaultInstanceOfEmailValidator()
 {
     $this->resetClassExists();
     $rule = new Email();
     $this->assertInstanceOf(EmailValidator::class, $rule->getEmailValidator());
 }