--- /dev/null
+<?php
+
+namespace Drupal\Tests\migrate_drupal\Unit\source\d6;
+
+use Drupal\Tests\migrate\Unit\MigrateSqlSourceTestCase;
+
+/**
+ * Tests the variable source plugin.
+ *
+ * @group migrate_drupal
+ */
+class VariableTranslationTest extends MigrateSqlSourceTestCase {
+
+ // The plugin system is not working during unit testing so the source plugin
+ // class needs to be manually specified.
+ const PLUGIN_CLASS = 'Drupal\migrate_drupal\Plugin\migrate\source\d6\VariableTranslation';
+
+ /**
+ * Define bare minimum migration configuration.
+ */
+ protected $migrationConfiguration = [
+ 'id' => 'test',
+ 'highWaterProperty' => ['field' => 'test'],
+ 'source' => [
+ 'plugin' => 'variable_translation',
+ 'variables' => [
+ 'site_slogan',
+ 'site_name',
+ ],
+ ],
+ ];
+
+ /**
+ * Expected results from the source.
+ */
+ protected $expectedResults = [
+ [
+ 'language' => 'fr',
+ 'site_slogan' => 'Migrate est génial',
+ 'site_name' => 'nom de site',
+ ],
+ [
+ 'language' => 'mi',
+ 'site_slogan' => 'Ko whakamataku heke',
+ 'site_name' => 'ingoa_pae',
+ ]
+ ];
+
+ /**
+ * Database contents for tests.
+ */
+ protected $databaseContents = [
+ 'i18n_variable' => [
+ ['name' => 'site_slogan', 'language' => 'fr', 'value' => 's:19:"Migrate est génial";'],
+ ['name' => 'site_name', 'language' => 'fr', 'value' => 's:11:"nom de site";'],
+ ['name' => 'site_slogan', 'language' => 'mi', 'value' => 's:19:"Ko whakamataku heke";'],
+ ['name' => 'site_name', 'language' => 'mi', 'value' => 's:9:"ingoa_pae";'],
+ ],
+ ];
+
+}