diff -u b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/MimeTypePassTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/MimeTypePassTest.php
--- b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/MimeTypePassTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/MimeTypePassTest.php
@@ -3,9 +3,7 @@
 namespace Drupal\Tests\Core\DependencyInjection\Compiler;
 
 use Drupal\Core\DependencyInjection\Compiler\MimeTypePass;
-use Drupal\Core\StreamWrapper\StreamWrapperManagerInterface;
 use Drupal\Tests\UnitTestCase;
-use Prophecy\Argument;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesserInterface as LegacyMimeTypeGuesserInterface;
 use Symfony\Component\Mime\MimeTypeGuesserInterface;