/**
  * Tests updating a search page during import.
  */
 protected function doSearchPageUpdate()
 {
     // Create a test search page with a known label.
     $name = 'search.page.apple';
     $entity = SearchPage::create(['id' => 'apple', 'plugin' => 'search_extra_type_search']);
     $entity->save();
     $this->checkSinglePluginConfigSync($entity, 'configuration', 'boost', 'bi');
     // Read the existing data, and prepare an altered version in sync.
     $custom_data = $original_data = $this->container->get('config.storage')->read($name);
     $custom_data['configuration']['boost'] = 'asdf';
     $this->assertConfigUpdateImport($name, $original_data, $custom_data);
 }