Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/quickedit/tests/modules/quickedit_test.info.yml

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+name: 'Quick Edit test'
+type: module
+description: 'Support module for the Quick Edit module tests.'
+core: 8.x
+package: Testing
+version: VERSION

core/modules/quickedit/tests/modules/quickedit_test.module

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+<?php
+
+/**
+ * @file
+ * Helper module for the Quick Edit tests.
+ */
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
+use Drupal\Core\Language\LanguageInterface;
+
+/**
+ * Implements hook_entity_view_alter().
+ */
+function quickedit_test_entity_view_alter(&$build, EntityInterface $entity, EntityViewDisplayInterface $display) {
+  if ($entity->getEntityTypeId() == 'node' && $entity->bundle() == 'article') {
+    $build['pseudo'] = array(
+      '#theme' => 'field',
+      '#title' => 'My pseudo field',
+      '#field_name' => 'quickedit_test_pseudo_field',
+      '#label_display' => 'Label',
+      '#entity_type' => $entity->getEntityTypeId(),
+      '#bundle' => $entity->bundle(),
+      '#language' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
+      '#field_type' => 'pseudo',
+      '#view_mode' => 'default',
+      '#object' => $entity,
+      '#access' => TRUE,
+      '#items' => array(
+        0 => array(
+          'value' => 'pseudo field',
+        ),
+      ),
+      0 => array(
+        '#markup' => 'pseudo field',
+      ),
+    );
+  }
+}
+
+/**
+ * Implements hook_quickedit_render_field().
+ */
+function quickedit_test_quickedit_render_field(EntityInterface $entity, $field_name, $view_mode_id, $langcode) {
+  $entity = \Drupal::entityManager()->getTranslationFromContext($entity, $langcode);
+  return array(
+    '#prefix' => '<div class="quickedit-test-wrapper">',
+    'field' => $entity->get($field_name)->view($view_mode_id),
+    '#suffix' => '</div>',
+  );
+}
+

core/modules/quickedit/tests/modules/src/MockEditEntityFieldAccessCheck.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\quickedit_test\MockEditEntityFieldAccessCheck.
+ */
+
+namespace Drupal\quickedit_test;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\quickedit\Access\EditEntityFieldAccessCheckInterface;
+
+/**
+ * Access check for editing entity fields.
+ */
+class MockEditEntityFieldAccessCheck implements EditEntityFieldAccessCheckInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function accessEditEntityField(EntityInterface $entity, $field_name) {
+    return TRUE;
+  }
+
+}

core/modules/quickedit/tests/modules/src/Plugin/InPlaceEditor/WysiwygEditor.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\quickedit_test\Plugin\InPlaceEditor\WysiwygEditor.
+ */
+
+namespace Drupal\quickedit_test\Plugin\InPlaceEditor;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\quickedit\Plugin\InPlaceEditorBase;
+
+/**
+ * Defines the 'wysiwyg' in-place editor.
+ *
+ * @InPlaceEditor(
+ *   id = "wysiwyg",
+ *   alternativeTo = {"plain_text"}
+ * )
+ */
+class WysiwygEditor extends InPlaceEditorBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isCompatible(FieldItemListInterface $items) {
+    $field_definition = $items->getFieldDefinition();
+
+    // This editor is incompatible with multivalued fields.
+    if ($field_definition->getFieldStorageDefinition()->getCardinality() != 1) {
+      return FALSE;
+    }
+    // This editor is compatible with formatted ("rich") text fields; but only
+    // if there is a currently active text format and that text format is the
+    // 'full_html' text format.
+    elseif (in_array($field_definition->getType(), array('text', 'text_long', 'text_with_summary'), TRUE)) {
+      if ($items[0]->format === 'full_html') {
+        return TRUE;
+      }
+      return FALSE;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMetadata(FieldItemListInterface $items) {
+    $metadata['format'] = $items[0]->format;
+    return $metadata;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getAttachments() {
+    return array(
+      'library' => array(
+        'quickedit_test/not-existing-wysiwyg',
+      ),
+    );
+  }
+
+}