function testPullRegionWithRenderContext()
 {
     // this is a dirty dirty mess. sorry.
     $req = new SS_HTTPRequest('GET', '/test1');
     $req->addHeader(AjaxHTTPResponse::PULL_HEADER, 'TestProductGroupItem:BUYABLE');
     $req->addHeader('X-Requested-With', 'XMLHttpRequest');
     $ctrl = new Controller();
     $ctrl->pushCurrent();
     $ctrl->setRequest($req);
     $ctrl->setDataModel(DataModel::inst());
     $ctrl->setURLParams(array());
     $ctrl->init();
     $response = $ctrl->getAjaxResponse();
     $response->addRenderContext('BUYABLE', new ArrayData(array('Title' => 'Test Product', 'Link' => '/test-product', 'Price' => 29.99)));
     $data = json_decode($response->getBody(), true);
     $ctrl->popCurrent();
     $this->assertNotEmpty($data[AjaxHTTPResponse::REGIONS_KEY]['TestProductGroupItem']);
 }