diff --git a/core/modules/file/tests/src/Kernel/FileUriItemTest.php b/core/modules/file/tests/src/Kernel/FileUriItemTest.php
index 5c38fa6441..ed16caab2a 100644
--- a/core/modules/file/tests/src/Kernel/FileUriItemTest.php
+++ b/core/modules/file/tests/src/Kernel/FileUriItemTest.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Drupal\Tests\file\Kernel;
+
 use Drupal\file\Entity\File;
 
 /**
@@ -29,7 +30,7 @@ public function testCustomFileUriField() {
     $file->save();
 
     $this->assertSame($uri, $file->uri->value);
-    $this->assertSame(file_url_transform_relative(file_create_url($uri), $file->uri->url));
+    $this->assertSame(file_url_transform_relative(file_create_url($uri)), $file->uri->url);
   }
 
 }
diff --git a/core/modules/file/tests/src/Unit/FileUrlTest.php b/core/modules/file/tests/src/Unit/FileUrlTest.php
index 93360a0b48..2c3c2ba993 100644
--- a/core/modules/file/tests/src/Unit/FileUrlTest.php
+++ b/core/modules/file/tests/src/Unit/FileUrlTest.php
@@ -6,14 +6,14 @@
 use Drupal\Core\TypedData\DataDefinitionInterface;
 use Drupal\file\FileInterface;
 use Drupal\file\FileUrl;
-use Drupal\Tests\UnitTestCase;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * @coversDefaultClass \Drupal\file\FileUrl
  *
  * @group file
  */
-class FileUrlTest extends UnitTestCase {
+class FileUrlTest extends KernelTestBase {
 
   /**
    * The test URL to use.
@@ -39,10 +39,12 @@ public function testGetValue() {
 
     $typed_data = new FileUrl($definition->reveal(), 'test', $parent->reveal());
 
-    $this->assertSame('/path/to/file.txt', $typed_data->getValue());
+    $expected = file_url_transform_relative(file_create_url($this->testUrl));
+
+    $this->assertSame($expected, $typed_data->getValue());
     // Do this a second time to confirm the same value is returned but the value
     // isn't retrieved from the parent entity again.
-    $this->assertSame('/path/to/file.txt', $typed_data->getValue());
+    $this->assertSame($expected, $typed_data->getValue());
   }
 
   /**