Simple PHP Selenium test doesn't work

[Flarialek]

I have the following Selenium test in PHP:\[code\]<?phprequire_once('PHPUnit/Extensions/SeleniumTestCase.php');class Example extends PHPUnit_Extensions_SeleniumTestCase{ protected function setUp() { $this->setBrowser("*chrome"); $this->setBrowserUrl("http://change-this-to-the-site-you-are-testing/"); } public function testMyTestCase() { $this->open("/frontend_dev.php"); try { $this->assertTrue($this->isTextPresent("Local Coupons")); } catch (PHPUnit_Framework_AssertionFailedError $e) { array_push($this->verificationErrors, $e->toString()); } }}\[/code\]When I try to run it (by running "php filename.php") I get the error:\[code\]PHP Fatal error: Class 'PHPUnit_Framework_TestCase' not found in /usr/share/php/PHPUnit/Extensions/SeleniumTestCase.php on line 60\[/code\]Which makes sense because the class isn't defined anywhere, but why not? I installed PHPUnit. It seems a little weird that a class called PHPUnit_Framework_TestCase wouldn't be included with PHPUnit. Any ideas?