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diff --git a/web/modules/contrib/diff/src/Tests/DiffPluginFileTest.php b/web/modules/contrib/diff/src/Tests/DiffPluginFileTest.php
new file mode 100644
index 000000000..1f41f5bfc
--- /dev/null
+++ b/web/modules/contrib/diff/src/Tests/DiffPluginFileTest.php
@@ -0,0 +1,288 @@
+<?php
+
+namespace Drupal\diff\Tests;
+
+use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\field_ui\Tests\FieldUiTestTrait;
+
+/**
+ * Tests the Diff module entity plugins.
+ *
+ * @group diff
+ */
+class DiffPluginFileTest 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 File plugin.
+   *
+   * @see \Drupal\diff\Plugin\diff\Field\FileFieldBuilder
+   */
+  public function testFilePlugin() {
+    // Add file field to the article content type.
+    $file_field_name = 'field_file';
+    $field_storage = FieldStorageConfig::create(array(
+      'field_name' => $file_field_name,
+      'entity_type' => 'node',
+      'type' => 'file',
+    ));
+    $field_storage->save();
+    FieldConfig::create([
+      'entity_type' => 'node',
+      'field_storage' => $field_storage,
+      'bundle' => 'article',
+      'label' => 'File',
+    ])->save();
+
+    // Make the field visible in the form and desfault display.
+    $this->viewDisplay->load('node.article.default')
+      ->setComponent('test_field')
+      ->setComponent($file_field_name)
+      ->save();
+    $this->formDisplay->load('node.article.default')
+      ->setComponent('test_field', ['type' => 'entity_reference_autocomplete'])
+      ->setComponent($file_field_name, ['type' => 'file_generic'])
+      ->save();
+
+    // Create an article.
+    $node = $this->drupalCreateNode([
+      'type' => 'article',
+      'title' => 'Test article',
+    ]);
+    $revision1 = $node->getRevisionId();
+
+    // Upload a file to the article.
+    $test_files = $this->drupalGetTestFiles('text');
+    $edit['files[field_file_0]'] = $this->fileSystem->realpath($test_files['0']->uri);
+    $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, 'Upload');
+    $edit['revision'] = TRUE;
+    $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
+    $node = $this->drupalGetNodeByTitle('Test article', TRUE);
+    $revision2 = $node->getRevisionId();
+
+    // Replace the file by a different one.
+    $this->drupalPostForm('node/' . $node->id() . '/edit', [], 'Remove');
+    $this->drupalPostForm(NULL, ['revision' => FALSE], t('Save and keep published'));
+    $edit['files[field_file_0]'] = $this->fileSystem->realpath($test_files['1']->uri);
+    $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, 'Upload');
+    $edit['revision'] = TRUE;
+    $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
+    $node = $this->drupalGetNodeByTitle('Test article', TRUE);
+    $revision3 = $node->getRevisionId();
+
+    // Check differences between revisions.
+    $this->clickLink(t('Revisions'));
+    $edit = [
+      'radios_left' => $revision1,
+      'radios_right' => $revision3,
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Compare selected revisions'));
+    $this->assertText('File');
+    $this->assertText('File: text-1.txt');
+    $this->assertText('File ID: 4');
+
+    // Use the unified fields layout.
+    $this->clickLink('Unified fields');
+    $this->assertResponse(200);
+    $this->assertText('File');
+    $this->assertText('File: text-1.txt');
+    $this->assertText('File ID: 4');
+  }
+
+  /**
+   * Tests the Image plugin.
+   *
+   * @see \Drupal\diff\Plugin\diff\Field\ImageFieldBuilder
+   */
+  public function testImagePlugin() {
+    // Add image field to the article content type.
+    $image_field_name = 'field_image';
+    FieldStorageConfig::create([
+      'field_name' => $image_field_name,
+      'entity_type' => 'node',
+      'type' => 'image',
+      'settings' => [],
+      'cardinality' => 1,
+    ])->save();
+
+    $field_config = FieldConfig::create([
+      'field_name' => $image_field_name,
+      'label' => 'Image',
+      'entity_type' => 'node',
+      'bundle' => 'article',
+      'required' => FALSE,
+      'settings' => ['alt_field' => 1],
+    ]);
+    $field_config->save();
+
+    $this->formDisplay->load('node.article.default')
+      ->setComponent($image_field_name, [
+        'type' => 'image_image',
+        'settings' => [],
+      ])
+      ->save();
+
+    $this->viewDisplay->load('node.article.default')
+      ->setComponent($image_field_name, [
+        'type' => 'image',
+        'settings' => [],
+      ])
+      ->save();
+
+    // Create an article.
+    $node = $this->drupalCreateNode([
+      'type' => 'article',
+      'title' => 'Test article',
+    ]);
+    $revision1 = $node->getRevisionId();
+
+    // Upload an image to the article.
+    $test_files = $this->drupalGetTestFiles('image');
+    $edit = ['files[field_image_0]' => $this->fileSystem->realpath($test_files['1']->uri)];
+    $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
+    $edit = [
+      'field_image[0][alt]' => 'Image alt',
+      'revision' => TRUE,
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Save and keep published'));
+    $node = $this->drupalGetNodeByTitle('Test article', TRUE);
+    $revision2 = $node->getRevisionId();
+
+    // Replace the image by a different one.
+    $this->drupalPostForm('node/' . $node->id() . '/edit', [], 'Remove');
+    $this->drupalPostForm(NULL, ['revision' => FALSE], t('Save and keep published'));
+    $edit = ['files[field_image_0]' => $this->fileSystem->realpath($test_files['1']->uri)];
+    $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
+    $edit = [
+      'field_image[0][alt]' => 'Image alt updated',
+      'revision' => TRUE,
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Save and keep published'));
+    $node = $this->drupalGetNodeByTitle('Test article', TRUE);
+    $revision3 = $node->getRevisionId();
+
+    // Check differences between revisions.
+    $this->clickLink(t('Revisions'));
+    $edit = [
+      'radios_left' => $revision1,
+      'radios_right' => $revision3,
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Compare selected revisions'));
+    $this->assertText('Image');
+    $this->assertText('Image: image-test-transparent-indexed.gif');
+    // Image title must be absent since it is not set in previous revisions.
+    $this->assertNoText('Title');
+
+    // Enable Title field in instance settings.
+    $this->drupalPostForm('admin/structure/types/manage/article/fields/node.article.field_image', [
+      'settings[title_field]' => 1,
+    ], 'Save settings');
+
+    // Add image title and alt text.
+    $edit = [
+      'field_image[0][alt]' => 'Image alt updated new',
+      'revision' => TRUE,
+      'field_image[0][title]' => 'Image title updated',
+    ];
+    $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
+    $this->drupalPostForm('node/' . $node->id() . '/revisions', [], t('Compare selected revisions'));
+    $rows = $this->xpath('//tbody/tr');
+    // Image title and alternative text must be shown.
+    $this->assertEqual(htmlspecialchars_decode(strip_tags($rows[2]->td[2]->asXML())), 'Alt: Image alt updated');
+    $this->assertEqual(htmlspecialchars_decode(strip_tags($rows[2]->td[5]->asXML())), 'Alt: Image alt updated new');
+    $this->assertEqual(htmlspecialchars_decode(strip_tags($rows[3]->td[2]->asXML())), '');
+    $this->assertEqual(htmlspecialchars_decode(strip_tags($rows[3]->td[5]->asXML())), 'Title: Image title updated');
+
+    // Show File ID.
+    $this->drupalGet('admin/config/content/diff/fields');
+    $this->drupalPostAjaxForm(NULL, [], 'node.field_image_settings_edit');
+    $edit = [
+      'fields[node.field_image][settings_edit_form][settings][show_id]' => TRUE,
+    ];
+    $this->drupalPostAjaxForm(NULL, $edit, 'node.field_image_plugin_settings_update');
+    $this->drupalPostForm(NULL, [], t('Save'));
+    $this->drupalPostForm('node/' . $node->id() . '/revisions', [], t('Compare selected revisions'));
+    // Alt and title must be hidden.
+    $this->assertText('File ID: 2');
+
+    // Disable alt image fields.
+    $this->drupalGet('admin/config/content/diff/fields');
+    $this->drupalPostAjaxForm(NULL, [], 'node.field_image_settings_edit');
+    $edit = [
+      'fields[node.field_image][settings_edit_form][settings][compare_alt_field]' => FALSE,
+    ];
+    $this->drupalPostAjaxForm(NULL, $edit, 'node.field_image_plugin_settings_update');
+    $this->drupalPostForm(NULL, [], t('Save'));
+    $this->drupalPostForm('node/' . $node->id() . '/revisions', [], t('Compare selected revisions'));
+    // Alt and title must be hidden.
+    $this->assertNoText('Alt: Image alt updated');
+    $this->assertNoText('Alt: Image alt updated new');
+    $this->assertText('Title: Image title updated');
+
+    // Disable title image fields, reenable alt.
+    $this->drupalGet('admin/config/content/diff/fields');
+    $this->drupalPostAjaxForm(NULL, [], 'node.field_image_settings_edit');
+    $edit = [
+      'fields[node.field_image][settings_edit_form][settings][compare_alt_field]' => TRUE,
+      'fields[node.field_image][settings_edit_form][settings][compare_title_field]' => FALSE,
+    ];
+    $this->drupalPostAjaxForm(NULL, $edit, 'node.field_image_plugin_settings_update');
+    $this->drupalPostForm(NULL, [], t('Save'));
+    $this->drupalPostForm('node/' . $node->id() . '/revisions', [], t('Compare selected revisions'));
+    $this->assertText('Alt: Image alt updated');
+    $this->assertText('Alt: Image alt updated new');
+    $this->assertNoText('Title: Image title updated');
+    // Assert the thumbnail is displayed.
+    $img1_url = file_create_url(\Drupal::token()->replace("public://styles/thumbnail/public/[date:custom:Y]-[date:custom:m]/" . $test_files['1']->name));
+    $image_url = file_url_transform_relative($img1_url);
+    $this->assertRaw($image_url);
+
+    // Disable thumbnail image field.
+    $this->drupalPostAjaxForm('admin/config/content/diff/fields', [], 'node.field_image_settings_edit');
+    $edit = [
+      'fields[node.field_image][settings_edit_form][settings][show_thumbnail]' => FALSE,
+    ];
+    $this->drupalPostAjaxForm(NULL, $edit, 'node.field_image_plugin_settings_update');
+    $this->drupalPostForm(NULL, [], t('Save'));
+    $this->drupalPostForm('node/' . $node->id() . '/revisions', [], t('Compare selected revisions'));
+
+    // Assert the thumbnail is not displayed.
+    $img1_url = file_create_url(\Drupal::token()->replace("public://styles/thumbnail/public/[date:custom:Y]-[date:custom:m]/" . $test_files['1']->name));
+    $image_url = file_url_transform_relative($img1_url);
+    $this->assertNoRaw($image_url);
+  }
+
+}