diff --git a/test.js b/test.js
index 6cd222b1..9dae654c 100755
--- a/test.js
+++ b/test.js
@@ -5169,6 +5169,10 @@ test.addPrettifyValue('Compare prettifyValue', [
         'Dienstag',
     ], 'de', 'Di');
 
+test.addPrettifyValue('Compare prettifyValue', [
+        'Tu,PH off',
+    ], 'de', 'Di,Feiertags geschlossen', 'only test');
+
 test.addPrettifyValue('Compare prettifyValue', [
         'PH',
     ], 'de', 'Feiertags');