.../Filter/FilterTestRestrictTagsAndAttributes.php |   41 ++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/core/modules/filter/tests/filter_test/lib/Drupal/filter_test/Plugin/Filter/FilterTestRestrictTagsAndAttributes.php b/core/modules/filter/tests/filter_test/lib/Drupal/filter_test/Plugin/Filter/FilterTestRestrictTagsAndAttributes.php
new file mode 100644
index 0000000..b7f8822
--- /dev/null
+++ b/core/modules/filter/tests/filter_test/lib/Drupal/filter_test/Plugin/Filter/FilterTestRestrictTagsAndAttributes.php
@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\filter_test\Plugin\Filter\FilterTestRestrictTagsAndAttributes.
+ */
+
+namespace Drupal\filter_test\Plugin\Filter;
+
+use Drupal\filter\Annotation\Filter;
+use Drupal\Core\Annotation\Translation;
+use Drupal\filter\Plugin\FilterBase;
+
+/**
+ * Provides a test filter to restirct HTML tags and attributes.
+ *
+ * @Filter(
+ *   id = "filter_test_restrict_tags_and_attributes",
+ *   module = "filter_test",
+ *   title = @Translation("Tag & attribute restricting filter"),
+ *   description = @Translation("Replaces all content with filter and text format information."),
+ *   type = FILTER_TYPE_HTML_RESTRICTOR
+ * )
+ */
+class FilterTestRestrictTagsAndAttributes extends FilterBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function process($text, $langcode, $cache, $cache_id) {
+    return $text;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getAllowedHTML() {
+    return $this->settings['restrictions'];
+  }
+
+}