.../QuickEditIntegrationTest.php                   | 76 +++++++++++++++-------
 1 file changed, 52 insertions(+), 24 deletions(-)

diff --git a/core/modules/quickedit/tests/src/FunctionalJavaScript/QuickEditIntegrationTest.php b/core/modules/quickedit/tests/src/FunctionalJavaScript/QuickEditIntegrationTest.php
index e1dda2b..b9deebf 100644
--- a/core/modules/quickedit/tests/src/FunctionalJavaScript/QuickEditIntegrationTest.php
+++ b/core/modules/quickedit/tests/src/FunctionalJavaScript/QuickEditIntegrationTest.php
@@ -175,21 +175,7 @@ public function testArticleNode() {
     ]);
 
     // Append something to the title.
-    // @todo Clean this up once PhantomJS is fixed, see http://sticksnglue.com/wordpress/phantomjs-1-9-and-keyboardevent/.
-    $text_to_type = $node->label() . ' Llamas are awesome!';
-    $js_simulate_user_typing = <<<JS
-function () {
-  window.KeyboardEvent = function(eventString) {
-    var keyboardEvent = document.createEvent('KeyboardEvent');
-    keyboardEvent.initKeyboardEvent(eventString, true, true, window, 1, 0, 0);
-    return keyboardEvent;
-  };
-  var el = document.querySelector('h1.js-quickedit-page-title > span');
-  el.textContent = '$text_to_type';
-  el.dispatchEvent(window.KeyboardEvent('keyup'));
-}()
-JS;
-    $this->getSession()->evaluateScript($js_simulate_user_typing);
+    $this->typeInPlainTextEditor('h1.js-quickedit-page-title > span', $node->label() . ' Llamas are awesome!');
     $this->assertEntityInstanceFieldStates('node', 1, 0, [
       'node/1/title/en/full'      => 'changed',
       'node/1/uid/en/full'        => 'candidate',
@@ -247,15 +233,7 @@ function () {
     ]);
 
     // Enter an additional tag.
-    $input = $this->cssSelect('.quickedit-form-container > .quickedit-form[role="dialog"] form.quickedit-field-form input[name="field_tags[target_id]"]')[0];
-    $input->setValue($input->getValue() . ', bar');
-    $js_simulate_user_typing = <<<JS
-function () {
-  var el = document.querySelector('.quickedit-form-container > .quickedit-form[role="dialog"] form.quickedit-field-form input[name="field_tags[target_id]"]');
-  window.jQuery(el).trigger('formUpdated');
-}()
-JS;
-    $this->getSession()->evaluateScript($js_simulate_user_typing);
+    $this->typeInFormEditorTextInputField('field_tags[target_id]', 'foo, bar');
     $this->assertEntityInstanceFieldStates('node', 1, 0, [
       'node/1/uid/en/full'        => 'candidate',
       'node/1/created/en/full'    => 'candidate',
@@ -495,4 +473,54 @@ function () {
     }
   }
 
+  /**
+   * Simulates typing in a 'plain_text' in-place editor.
+   *
+   * @param string $css_selector
+   *   The CSS selector to find the DOM element (with the 'contenteditable=true'
+   *   attribute set), to type in.
+   * @param $text
+   *   The text to type.
+   *
+   * @see \Drupal\quickedit\Plugin\InPlaceEditor\PlainTextEditor
+   */
+  protected function typeInPlainTextEditor($css_selector, $text) {
+    // @todo Clean this up once PhantomJS is fixed, see http://sticksnglue.com/wordpress/phantomjs-1-9-and-keyboardevent/.
+    $js_simulate_user_typing = <<<JS
+function () {
+  window.KeyboardEvent = function(eventString) {
+    var keyboardEvent = document.createEvent('KeyboardEvent');
+    keyboardEvent.initKeyboardEvent(eventString, true, true, window, 1, 0, 0);
+    return keyboardEvent;
+  };
+  var el = document.querySelector('$css_selector');
+  el.textContent = '$text';
+  el.dispatchEvent(window.KeyboardEvent('keyup'));
+}()
+JS;
+    $this->getSession()->evaluateScript($js_simulate_user_typing);
+  }
+
+  /**
+   * Simulates typing in an input[type=text] inside a 'form' in-place editor.
+   *
+   * @param string $input_name
+   *   The "name" attribute of the input[type=text] to type in.
+   * @param $text
+   *   The text to type.
+   *
+   * @see \Drupal\quickedit\Plugin\InPlaceEditor\FormEditor
+   */
+  protected function typeInFormEditorTextInputField($input_name, $text) {
+    $input = $this->cssSelect('.quickedit-form-container > .quickedit-form[role="dialog"] form.quickedit-field-form input[type=text][name="' . $input_name . '"]')[0];
+    $input->setValue($text);
+    $js_simulate_user_typing = <<<JS
+function () {
+  var el = document.querySelector('.quickedit-form-container > .quickedit-form[role="dialog"] form.quickedit-field-form input[name="$input_name"]');
+  window.jQuery(el).trigger('formUpdated');
+}()
+JS;
+    $this->getSession()->evaluateScript($js_simulate_user_typing);
+  }
+
 }