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diff --git a/web/modules/contrib/diff/src/Tests/DiffPluginEntityTest.php b/web/modules/contrib/diff/src/Tests/DiffPluginEntityTest.php
new file mode 100644
index 000000000..c9eb4ec9d
--- /dev/null
+++ b/web/modules/contrib/diff/src/Tests/DiffPluginEntityTest.php
@@ -0,0 +1,97 @@
+<?php
+
+namespace Drupal\diff\Tests;
+
+use Drupal\field_ui\Tests\FieldUiTestTrait;
+
+/**
+ * Tests the Diff module entity plugins.
+ *
+ * @group diff
+ */
+class DiffPluginEntityTest extends DiffPluginTestBase {
+
+  use FieldUiTestTrait;
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = [
+    'file',
+    'image',
+    'field_ui',
+  ];
+
+  /**
+   * The file system service.
+   *
+   * @var \Drupal\Core\File\FileSystemInterface
+   */
+  protected $fileSystem;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->fileSystem = \Drupal::service('file_system');
+
+    // FieldUiTestTrait checks the breadcrumb when adding a field, so we need
+    // to show the breadcrumb block.
+    $this->drupalPlaceBlock('system_breadcrumb_block');
+  }
+
+  /**
+   * Tests the EntityReference plugin.
+   *
+   * @see \Drupal\diff\Plugin\diff\Field\EntityReferenceFieldBuilder
+   */
+  public function testEntityReferencePlugin() {
+    // Add an entity reference field to the article content type.
+    $bundle_path = 'admin/structure/types/manage/article';
+    $field_name = 'reference';
+    $storage_edit = $field_edit = array();
+    $storage_edit['settings[target_type]'] = 'node';
+    $field_edit['settings[handler_settings][target_bundles][article]'] = TRUE;
+    $this->fieldUIAddNewField($bundle_path, $field_name, 'Reference', 'entity_reference', $storage_edit, $field_edit);
+
+    // Create three article nodes.
+    $node1 = $this->drupalCreateNode([
+      'type' => 'article',
+      'title' => 'Article A',
+    ]);
+    $node2 = $this->drupalCreateNode([
+      'type' => 'article',
+      'title' => 'Article B',
+    ]);
+    $node3 = $this->drupalCreateNode([
+      'type' => 'article',
+      'title' => 'Article C',
+    ]);
+
+    // Reference article B in article A.
+    $edit = array(
+      'field_reference[0][target_id]' => 'Article B (' . $node2->id() . ')',
+      'revision' => TRUE,
+    );
+    $this->drupalPostForm('node/' . $node1->id() . '/edit', $edit, t('Save and keep published'));
+
+    // Update article A so it points to article C instead of B.
+    $edit = array(
+      'field_reference[0][target_id]' => 'Article C (' . $node3->id() . ')',
+      'revision' => TRUE,
+    );
+    $this->drupalPostForm('node/' . $node1->id() . '/edit', $edit, t('Save and keep published'));
+
+    // Check differences between revisions.
+    $this->clickLink(t('Revisions'));
+    $this->drupalPostForm(NULL, NULL, t('Compare selected revisions'));
+    $this->assertText('Reference');
+    $this->assertText('Article B');
+    $this->assertText('Article C');
+  }
+
+}