--- /dev/null
+<?php
+
+namespace Drupal\Tests\views\Kernel\Plugin;
+
+use Drupal\Tests\views\Kernel\ViewsKernelTestBase;
+use Drupal\views_test_data\Plugin\views\display_extender\DisplayExtenderTest as DisplayExtenderTestData;
+use Drupal\views\Views;
+
+/**
+ * Tests the display extender plugins.
+ *
+ * @group views
+ * @see \Drupal\views_test_data\Plugin\views\display_extender\DisplayExtenderTest
+ */
+class DisplayExtenderTest extends ViewsKernelTestBase {
+
+ /**
+ * Views used by this test.
+ *
+ * @var array
+ */
+ public static $testViews = ['test_view'];
+
+ /**
+ * Test display extenders.
+ */
+ public function testDisplayExtenders() {
+ $this->config('views.settings')->set('display_extenders', ['display_extender_test'])->save();
+ $this->assertEqual(count(Views::getEnabledDisplayExtenders()), 1, 'Make sure that there is only one enabled display extender.');
+
+ $view = Views::getView('test_view');
+ $view->initDisplay();
+
+ $this->assertEqual(count($view->display_handler->getExtenders()), 1, 'Make sure that only one extender is initialized.');
+
+ $display_extender = $view->display_handler->getExtenders()['display_extender_test'];
+ $this->assertTrue($display_extender instanceof DisplayExtenderTestData, 'Make sure the right class got initialized.');
+
+ $view->preExecute();
+ $this->assertTrue($display_extender->testState['preExecute'], 'Make sure the display extender was able to react on preExecute.');
+ $view->execute();
+ $this->assertTrue($display_extender->testState['query'], 'Make sure the display extender was able to react on query.');
+ }
+
+}