diff -u b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.active_theme.html.twig b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.active_theme.html.twig
--- b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.active_theme.html.twig
+++ b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.active_theme.html.twig
@@ -1 +1 @@
-<div>active theme: {{ active_theme() }}</div>
\ No newline at end of file
+<div>active theme: {{ active_theme() }}</div>
diff -u b/core/modules/system/tests/modules/twig_theme_test/twig_theme_test.routing.yml b/core/modules/system/tests/modules/twig_theme_test/twig_theme_test.routing.yml
--- b/core/modules/system/tests/modules/twig_theme_test/twig_theme_test.routing.yml
+++ b/core/modules/system/tests/modules/twig_theme_test/twig_theme_test.routing.yml
@@ -64 +64,2 @@
-    _access: 'TRUE'
\ No newline at end of file
+    _access: 'TRUE'
+    
\ No newline at end of file