Index: trunk/test/unit/org/openstreetmap/josm/gui/dialogs/properties/TagEditHelperTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/gui/dialogs/properties/TagEditHelperTest.java	(revision 18842)
+++ trunk/test/unit/org/openstreetmap/josm/gui/dialogs/properties/TagEditHelperTest.java	(revision 18844)
@@ -125,4 +125,5 @@
     void testTicket23191() {
         TestUtils.assumeWorkingJMockit();
+        new WindowMocker();
         final TagEditHelper tagEditHelper = newTagEditHelper();
         final DataSet original = new DataSet();