diff --git a/core/modules/system/tests/src/Functional/Update/WarmCacheUpdateFrom8dot6Test.php b/core/modules/system/tests/src/Functional/Update/WarmCacheUpdateFrom8dot6Test.php
index 69810efae2..9d9e4026ff 100644
--- a/core/modules/system/tests/src/Functional/Update/WarmCacheUpdateFrom8dot6Test.php
+++ b/core/modules/system/tests/src/Functional/Update/WarmCacheUpdateFrom8dot6Test.php
@@ -24,6 +24,13 @@ protected function setDatabaseDumpFiles() {
     $this->databaseDumpFiles[1] = __DIR__ . '/../../../../tests/fixtures/update/drupal-8.test-config-init.php';
   }
 
+  /**
+   * Tests \Drupal\Core\Extension\ExtensionList::getList().
+   */
+  public function testGetExtensionList() {
+    $this->container->get('extension.list.module')->reset()->getList();
+  }
+
   /**
    * Tests \Drupal\Core\Update\UpdateKernel::fixSerializedExtensionObjects().
    */