public function testIsAjax()
 {
     $request = new Request($this->container, array(), array(), array(), array(), array());
     $this->assertFalse($request->isAjax());
     $request = new Request($this->container, array('HTTP_X_REQUESTED_WITH' => 'XMLHttpRequest'), array(), array(), array(), array());
     $this->assertTrue($request->isAjax());
 }