diff -u b/core/modules/file/tests/src/Kernel/FileModuleTest.php b/core/modules/file/tests/src/Kernel/FileModuleTest.php
--- b/core/modules/file/tests/src/Kernel/FileModuleTest.php
+++ b/core/modules/file/tests/src/Kernel/FileModuleTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\file\Kernel;
 
+use Drupal\Component\Utility\Environment;
 use Drupal\Core\StringTranslation\TranslatableMarkup;
 use Drupal\KernelTests\KernelTestBase;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
@@ -44,7 +45,13 @@
       ->execute()
       ->fetchAll();
     $actual_log_message = $results[0]->message;
-    $expected_log_message = sprintf($expected_log_message, $file_name);
+    if ($error == UPLOAD_ERR_INI_SIZE || $error == UPLOAD_ERR_FORM_SIZE) {
+      $upload_size = format_size(Environment::getUploadMaxSize())->render();
+      $expected_log_message = sprintf($expected_log_message, $file_name, $upload_size);
+    }
+    else {
+      $expected_log_message = sprintf($expected_log_message, $file_name);
+    }
     $this->assertSame($expected_log_message, $actual_log_message);
   }
 
@@ -52,14 +59,15 @@
    * Data provider for testFileSaveUploadSingle.
    */
   public function providerFileSaveUploadSingle() {
+
     return [
       [
         UPLOAD_ERR_INI_SIZE,
-        'The file %s could not be saved because it exceeds 100 MB, the maximum allowed size for uploads.',
+        'The file %s could not be saved because it exceeds %s, the maximum allowed size for uploads.',
       ],
       [
         UPLOAD_ERR_FORM_SIZE,
-        'The file %s could not be saved because it exceeds 100 MB, the maximum allowed size for uploads.',
+        'The file %s could not be saved because it exceeds %s, the maximum allowed size for uploads.',
       ],
       [
         UPLOAD_ERR_PARTIAL,