--- /dev/null
+<?php
+
+namespace Drupal\Tests\comment\Kernel\Plugin\migrate\source\d6;
+
+use Drupal\Tests\migrate\Kernel\MigrateSqlSourceTestBase;
+
+/**
+ * Tests comment variable per comment type source plugin.
+ *
+ * @covers \Drupal\comment\Plugin\migrate\source\d6\CommentVariablePerCommentType
+ * @group comment
+ */
+class CommentVariablePerCommentTypeTest extends MigrateSqlSourceTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['comment', 'migrate_drupal'];
+
+ /**
+ * {@inheritdoc}
+ */
+ public function providerSource() {
+ $tests = [];
+
+ // The source data.
+ $tests[0]['source_data']['node_type'] = [
+ [
+ 'type' => 'page',
+ ],
+ [
+ 'type' => 'story',
+ ],
+ ];
+
+ $tests[0]['source_data']['variable'] = [
+ [
+ 'name' => 'comment_subject_field_page',
+ 'value' => serialize(1),
+ ],
+ [
+ 'name' => 'comment_subject_field_story',
+ 'value' => serialize(0),
+ ],
+ ];
+
+ // The expected results.
+ // Each result will also include a label and description, but those are
+ // static values set by the source plugin and don't need to be asserted.
+ $tests[0]['expected_data'] = [
+ [
+ 'comment_type' => 'comment',
+ ],
+ [
+ 'comment_type' => 'comment_no_subject',
+ ],
+ ];
+
+ return $tests;
+ }
+
+}