Issue #3381848: On the mapping list, display which Tamper plugins are applied.

composer.json

@@ -16,5 +16,8 @@
   "require": {
     "drupal/migrate_plus": "^5.0|^6.0",
     "drupal/migrate_tools": "^5.0|^6.0"
+  },
+  "require-dev": {
+    "drupal/tamper": "^1.0"
   }
 }

modules/migrate_tamper/src/Plugin/migrate/process/Form/TamperForm.php

@@ -73,6 +73,14 @@ class TamperForm extends MigrateFormPluginBase {
     );
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getSummary() {
+    $summary[] = $this->tamper->getPluginDefinition()['label'];
+    return $summary;
+  }
+
   /**
    * {@inheritdoc}
    */

modules/migrate_tamper/tests/src/Functional/UiTest.php

+<?php
+
+namespace Drupal\Tests\migrate_tamper\Functional;
+
+use Drupal\feeds_migrate\Entity\Migration;
+use Drupal\Tests\feeds_migrate\Functional\FeedsMigrateBrowserTestBase;
+
+/**
+ * Tests configuring and display tampers in the UI.
+ *
+ * @group migrate_tamper
+ */
+class UiTest extends FeedsMigrateBrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'file',
+    'node',
+    'user',
+    'migrate',
+    'migrate_plus',
+    'migrate_tools',
+    'feeds_migrate',
+    'feeds_migrate_ui',
+    'feeds_migrate_test',
+    'migrate_tamper',
+    'system',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    // Create a migration entity.
+    $migration = Migration::create([
+      'id' => 'example_migration',
+      'label' => 'Example Migration',
+      'migration_group' => 'default',
+      'source' => [
+        'plugin' => 'url',
+        'data_fetcher_plugin' => 'http',
+        'data_parser_plugin' => 'simple_xml',
+      ],
+      'destination' => [
+        'plugin' => 'entity:node',
+        'default_bundle' => 'article',
+      ],
+      'process' => [],
+      'migration_tags' => [],
+      'migration_dependencies' => [],
+    ]);
+    $migration->save();
+  }
+
+  /**
+   * Tests displaying summary on mapping page.
+   */
+  public function testSummary() {
+    // Programmatically add mapping to title, with tamper plugins applied.
+    $migration = Migration::load('example_migration');
+    $migration->set('process', [
+      'title' => [
+        [
+          'plugin' => 'tamper:required',
+          'invert' => FALSE,
+        ],
+        [
+          'plugin' => 'tamper:trim',
+          'character' => '',
+          'side' => 'ltrim',
+        ],
+      ],
+    ]);
+    $migration->save();
+    $this->drupalGet('/admin/structure/migrate/sources/example_migration/mapping');
+
+    // Assert that the two Tamper plugins are displayed.
+    $this->assertSession()->pageTextContains('Required');
+    $this->assertSession()->pageTextContains('Characters to trim');
+  }
+
+}