diff -u b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/ContactCategoryTest.php b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/ContactCategoryTest.php
--- b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/ContactCategoryTest.php
+++ b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/ContactCategoryTest.php
@@ -15,7 +15,7 @@
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['contact', 'migrate_drupal'];
+  public static $modules = ['contact', 'migrate_drupal', 'user'];
 
   /**
    * {@inheritdoc}
diff -u b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/d6/ContactSettingsTest.php b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/d6/ContactSettingsTest.php
--- b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/d6/ContactSettingsTest.php
+++ b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/d6/ContactSettingsTest.php
@@ -15,7 +15,7 @@
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['contact', 'migrate_drupal'];
+  public static $modules = ['contact', 'migrate_drupal', 'user'];
 
   /**
    * {@inheritdoc}
@@ -39,13 +39,14 @@
         'selected' => '1',
       ]
     ];
-
     $tests[0][1] = [
       [
         'default_category' => '1',
         'site_name' => 'Blorf!',
       ],
     ];
+    $tests[0][2] = NULL;
+    $tests[0][3]['variables'] = ['site_name'];
 
     return $tests;
   }