Issue #2452659 by cilefen: Taxonomy term View preview is broken

core/modules/views/src/Tests/ViewExecutableTest.php

@@ -350,7 +350,7 @@ protected function assertViewDestroy($view) {
     $reflection = new \ReflectionClass($view);
     $defaults = $reflection->getDefaultProperties();
     // The storage and user should remain.
-    unset($defaults['storage'], $defaults['user'], $defaults['request']);
+    unset($defaults['storage'], $defaults['user'], $defaults['request'], $defaults['routeProvider']);
 
     foreach ($defaults as $property => $default) {
       $this->assertIdentical($this->getProtectedProperty($view, $property), $default);

core/modules/views/src/ViewExecutable.php

@@ -1923,7 +1923,7 @@ public function destroy() {
     $defaults = $reflection->getDefaultProperties();
     // The external dependencies should not be reset. This is not generated by
     // the execution of a view.
-    unset($defaults['storage'], $defaults['user'], $defaults['request']);
+    unset($defaults['storage'], $defaults['user'], $defaults['request'], $defaults['routeProvider']);
 
     foreach ($defaults as $property => $default) {
       $this->{$property} = $default;

core/modules/views_ui/src/Tests/PreviewTest.php

@@ -92,6 +92,18 @@ function testPreviewUI() {
     $this->assertTrue(strpos($result[0], '<title>' . $view['page[title]'] . '</title>'), 'The Feed RSS preview was rendered.');
   }
 
+  /**
+   * Tests the taxonomy term preview AJAX.
+   *
+   * This tests a specific regression in the taxonomy term view preview.
+   *
+   * @see https://www.drupal.org/node/2452659
+   */
+  public function testTaxonomyAJAX() {
+    \Drupal::service('module_installer')->install(array('taxonomy'));
+    $this->getPreviewAJAX('taxonomy_term', 'page_1', 0);
+  }
+
   /**
    * Tests pagers in the preview form.
    */