--- /dev/null
+<?php
+
+namespace Drupal\Tests\user\Kernel\Plugin\migrate\source\d6;
+
+use Drupal\Tests\migrate\Kernel\MigrateSqlSourceTestBase;
+
+/**
+ * Tests the d6_user_picture_file source plugin.
+ *
+ * @covers \Drupal\user\Plugin\migrate\source\d6\UserPictureFile
+ * @group user
+ */
+class UserPictureFileTest extends MigrateSqlSourceTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['user', 'migrate_drupal'];
+
+ /**
+ * {@inheritdoc}
+ */
+ public function providerSource() {
+ $tests = [];
+
+ // The source data.
+ $tests[0]['source_data']['users'] = [
+ [
+ 'uid' => '2',
+ 'picture' => 'core/modules/simpletest/files/image-test.jpg',
+ ],
+ [
+ 'uid' => '15',
+ 'picture' => '',
+ ],
+ ];
+
+ // The expected results.
+ $tests[0]['expected_data'] = [
+ [
+ 'uid' => '2',
+ 'picture' => 'core/modules/simpletest/files/image-test.jpg',
+ ],
+ ];
+
+ return $tests;
+ }
+
+}