core/modules/media/tests/src/Functional/MediaSourceFileTest.php | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/core/modules/media/tests/src/Functional/MediaSourceFileTest.php b/core/modules/media/tests/src/Functional/MediaSourceFileTest.php
index 881b95c..caa0f79 100644
--- a/core/modules/media/tests/src/Functional/MediaSourceFileTest.php
+++ b/core/modules/media/tests/src/Functional/MediaSourceFileTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\media\Functional;
 
+use Drupal\field\Entity\FieldConfig;
 use Drupal\media\Entity\MediaType;
 
 /**
@@ -26,13 +27,13 @@ protected function setUp() {
    * Test that it's possible to change the allowed file extensions.
    */
   public function testSourceFieldSettingsEditing() {
-
     $session = $this->getSession();
     $page = $session->getPage();
     $assert_session = $this->assertSession();
 
-    $mediaType = $this->createMediaType([], 'file');
-    $media_type_id = $mediaType->id();
+    $media_type = $this->createMediaType([], 'file');
+    $media_type_id = $media_type->id();
+    $this->assertSame('txt doc docx pdf', FieldConfig::load("media.$media_type_id.field_media_file")->get('settings')['file_extensions']);
 
     $this->drupalGet("admin/structure/media/manage/$media_type_id/fields/media.$media_type_id.field_media_file");
 
@@ -47,6 +48,7 @@ public function testSourceFieldSettingsEditing() {
 
     // Verify that new extension is present.
     $assert_session->fieldValueEquals('settings[file_extensions]', 'txt, doc, docx, pdf, odt');
+    $this->assertSame('txt doc docx pdf odt', FieldConfig::load("media.$media_type_id.field_media_file")->get('settings')['file_extensions']);
   }
 
 }