/**
  * Tests whether the Panels display config schema is valid.
  */
 public function testPanelsConfigSchema()
 {
     $panels_display = $this->panelsManager->createDisplay();
     // Add a block.
     $panels_display->addBlock(['id' => 'entity_view:node', 'label' => 'View the node', 'provider' => 'page_manager', 'label_display' => 'visible', 'view_mode' => 'default', 'region' => 'middle']);
     $config = $this->panelsManager->exportDisplay($panels_display);
     // This will throw an exception if it doesn't validate.
     $new_panels_display = $this->panelsManager->importDisplay($config, TRUE);
     $this->assertEqual($panels_display->getConfiguration(), $new_panels_display->getConfiguration());
 }