phpunit and selenium test not working.

testing.php

<?php

class TestLogin extends PHPUnit_Extensions_Selenium2TestCase {
    public function setUp() {
        $this->setHost('localhost');
        $this->setPort(4444);
        $this->setBrowser('firefox');
        $this->setBrowseUrl('');
    }
    
    public function testHasLoginForm(){
        $this->url('http://www.stevesmename.com');
    }
}

?>