public function testGetValidator()
 {
     $factory = new UrlSchemeValidators();
     $this->assertNotNull($factory->getValidator('http'), 'http');
     $this->assertNotNull($factory->getValidator('https'), 'https');
     $this->assertNotNull($factory->getValidator('ftp'), 'ftp');
     $this->assertNotNull($factory->getValidator('irc'), 'irc');
     $this->assertNotNull($factory->getValidator('mailto'), 'mailto');
     $this->assertNotNull($factory->getValidator('telnet'), 'telnet');
     $this->assertNull($factory->getValidator('notaprotocol'), 'notaprotocol');
 }