--- /dev/null
+<?php
+
+namespace Drupal\Tests\migrate\Kernel;
+
+use Drupal\comment\Entity\CommentType;
+use Drupal\node\Entity\NodeType;
+
+/**
+ * Provides methods for testing node and comment combinations.
+ */
+trait NodeCommentCombinationTrait {
+
+ /**
+ * Creates a node type with a corresponding comment type.
+ *
+ * @param string $node_type
+ * The node type ID.
+ * @param string $comment_type
+ * (optional) The comment type ID, if not provided defaults to
+ * comment_node_{type}.
+ */
+ protected function createNodeCommentCombination($node_type, $comment_type = NULL) {
+ if (!$comment_type) {
+ $comment_type = "comment_node_$node_type";
+ }
+ NodeType::create([
+ 'type' => $node_type,
+ 'label' => $this->randomString(),
+ ])->save();
+
+ CommentType::create([
+ 'id' => $comment_type,
+ 'label' => $this->randomString(),
+ 'target_entity_type_id' => 'node',
+ ])->save();
+ }
+
+}