diff --git a/core/modules/views/src/Plugin/views/field/FieldPluginBase.php b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
index 10fc04a..0529d39 100644
--- a/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
+++ b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
@@ -877,7 +877,7 @@ public function buildOptionsForm(&$form, FormStateInterface $form_state) {
       // Default text.
 
       $output = [];
-      $output[][ '#markup'] = '<p>' . $this->t('You must add some additional fields to this display before using this field. These fields may be marked as <em>Exclude from display</em> if you prefer. Note that due to rendering order, you cannot use fields that come after this field; if you need a field not listed here, rearrange your fields.') . '</p>';
+      $output[]['#markup'] = '<p>' . $this->t('You must add some additional fields to this display before using this field. These fields may be marked as <em>Exclude from display</em> if you prefer. Note that due to rendering order, you cannot use fields that come after this field; if you need a field not listed here, rearrange your fields.') . '</p>';
       // We have some options, so make a list.
       if (!empty($options)) {
         $output[]['#markup'] = '<p>' . $this->t("The following replacement tokens are available for this field. Note that due to rendering order, you cannot use fields that come after this field; if you need a field not listed here, rearrange your fields.") . '</p>';
diff --git a/core/modules/views_ui/src/Tests/UITestBase.php b/core/modules/views_ui/src/Tests/UITestBase.php
index 1fe0cec..a34a610 100644
--- a/core/modules/views_ui/src/Tests/UITestBase.php
+++ b/core/modules/views_ui/src/Tests/UITestBase.php
@@ -74,4 +74,21 @@ public function randomView(array $view = array()) {
     return $default;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function drupalGet($path, array $options = array(), array $headers = array()) {
+    $url = $this->buildUrl($path, $options);
+
+    // Ensure that each nojs page is accessible via ajax as well.
+    if (empty($options['no_ajax_check']) && strpos($url, 'nojs') !== FALSE) {
+      $url = str_replace('nojs', 'ajax', $url);
+      $this->drupalGet($url, $options, $headers);
+      $this->assertResponse(200);
+    }
+
+    return parent::drupalGet($path, $options, $headers);
+  }
+
+
 }