/**
  * testClientExtensionDetection.
  *
  * @return void
  */
 public function testDetectClientExtension()
 {
     $back = env('HTTP_USER_AGENT');
     $_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4 FirePHP/0.2.1';
     $this->assertTrue(FireCake::detectClientExtension());
     $_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4 FirePHP/0.0.4';
     $this->assertFalse(FireCake::detectClientExtension());
     $_SERVER['HTTP_USER_AGENT'] = 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.0.4) Gecko/2008102920 Firefox/3.0.4';
     $this->assertFalse(FireCake::detectClientExtension());
     $_SERVER['HTTP_USER_AGENT'] = $back;
 }