diff --git a/core/modules/system/lib/Drupal/system/Tests/File/FileTestBase.php b/core/modules/system/lib/Drupal/system/Tests/File/FileTestBase.php
index 2c72383..bfb6dd6 100644
--- a/core/modules/system/lib/Drupal/system/Tests/File/FileTestBase.php
+++ b/core/modules/system/lib/Drupal/system/Tests/File/FileTestBase.php
@@ -20,13 +20,6 @@ class FileTestBase extends WebTestBase {
     $modules = func_get_args();
     $modules = (isset($modules[0]) && is_array($modules[0]) ? $modules[0] : $modules);
     parent::setUp($modules);
-
-    // Make sure that custom stream wrappers are registered.
-    // @todo This has the potential to be a major bug deeply buried in File API;
-    //   file_unmanaged_*() API functions and test functions are invoking native
-    //   PHP functions directly, whereas Drupal's custom stream wrappers are not
-    //   registered yet.
-    file_get_stream_wrappers();
   }
 
   /**