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diff --git a/web/core/modules/filter/tests/filter_test/src/Plugin/Filter/FilterTestAssets.php b/web/core/modules/filter/tests/filter_test/src/Plugin/Filter/FilterTestAssets.php
new file mode 100644
index 000000000..5f63a06b0
--- /dev/null
+++ b/web/core/modules/filter/tests/filter_test/src/Plugin/Filter/FilterTestAssets.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Drupal\filter_test\Plugin\Filter;
+
+use Drupal\filter\FilterProcessResult;
+use Drupal\filter\Plugin\FilterBase;
+
+/**
+ * Provides a test filter to attach assets
+ *
+ * @Filter(
+ *   id = "filter_test_assets",
+ *   title = @Translation("Testing filter"),
+ *   description = @Translation("Does not change content; attaches assets."),
+ *   type = Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_REVERSIBLE
+ * )
+ */
+class FilterTestAssets extends FilterBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function process($text, $langcode) {
+    $result = new FilterProcessResult($text);
+    $result->addAttachments([
+      'library' => [
+        'filter/caption',
+      ],
+    ]);
+    return $result;
+  }
+
+}