Tests the preview output for json output.
public function testPreview() {
$view = views_get_view('test_serializer_display_entity');
$view
->setDisplay('rest_export_1');
$this
->executeView($view);
// Get the serializer service.
$serializer = $this->container
->get('serializer');
$entities = array();
foreach ($view->result as $row) {
$entities[] = $row->_entity;
}
$expected = check_plain($serializer
->serialize($entities, 'json'));
$view->display_handler
->setContentType('json');
$view->live_preview = TRUE;
$build = $view
->preview();
$rendered_json = $build['#markup'];
$this
->assertEqual($rendered_json, $expected, 'Ensure the previewed json is escaped.');
}