diff --git a/core/modules/system/src/Tests/File/ReadOnlyStreamWrapperTest.php b/core/modules/system/src/Tests/File/ReadOnlyStreamWrapperTest.php
index d1128c4..44a9af1 100644
--- a/core/modules/system/src/Tests/File/ReadOnlyStreamWrapperTest.php
+++ b/core/modules/system/src/Tests/File/ReadOnlyStreamWrapperTest.php
@@ -2,6 +2,9 @@
 
 namespace Drupal\system\Tests\File;
 
+use Drupal\Core\StreamWrapper\StreamWrapperInterface;
+use Drupal\file_test\StreamWrapper\DummyReadOnlyStreamWrapper;
+
 /**
  * Tests the read-only stream wrapper write functions.
  *
@@ -27,6 +30,10 @@ class ReadOnlyStreamWrapperTest extends FileTestBase {
    * Test read-only specific behavior.
    */
   function testReadOnlyBehavior() {
+    $type = DummyReadOnlyStreamWrapper::getType();
+    // Checks that the stream wrapper type is not declared as writable.
+    $this->assertIdentical(0, $type & StreamWrapperInterface::WRITE);
+
     // Generate a test file
     $filename = $this->randomMachineName();
     $site_path = $this->container->get('site.path');
diff --git a/core/tests/Drupal/Tests/Core/File/LocalReadOnlyStreamTest.php b/core/tests/Drupal/Tests/Core/File/LocalReadOnlyStreamTest.php
deleted file mode 100644
index e870576..0000000
--- a/core/tests/Drupal/Tests/Core/File/LocalReadOnlyStreamTest.php
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-
-namespace Drupal\Tests\Core\File;
-
-use Drupal\Core\StreamWrapper\StreamWrapperInterface;
-use Drupal\file_test\StreamWrapper\DummyReadOnlyStreamWrapper;
-use Drupal\Tests\UnitTestCase;
-
-/**
- * @coversDefaultClass \Drupal\Core\StreamWrapper\LocalReadOnlyStream
- * @group File
- */
-class LocalReadOnlyStreamTest extends UnitTestCase {
-
-  /**
-   * Tests if the stream wrapper correctly returns its type.
-   */
-  public function testGetType() {
-    $type = DummyReadOnlyStreamWrapper::getType();
-    // Checks that the stream wrapper type is not declared as writable.
-    $this->assertSame(0, $type & StreamWrapperInterface::WRITE);
-  }
-
-}