diff --git a/core/tests/Drupal/Tests/Core/Cache/Context/HeadersCacheContextTest.php b/core/tests/Drupal/Tests/Core/Cache/Context/HeadersCacheContextTest.php
index c1f42906b4..8f69e21740 100644
--- a/core/tests/Drupal/Tests/Core/Cache/Context/HeadersCacheContextTest.php
+++ b/core/tests/Drupal/Tests/Core/Cache/Context/HeadersCacheContextTest.php
@@ -47,6 +47,7 @@ public function providerTestGetContext() {
       [['z' => ['0', '1']], NULL, 'z=0,1'],
       // Values are sorted to minimize cache variations.
       [['z' => ['1', '0'], 'a' => []], NULL, 'a=&z=0,1'],
+      [['a' => [], 'z' => ['1', '0']], NULL, 'a=&z=0,1'],
     ];
   }