Index: trunk/test/unit/org/openstreetmap/josm/gui/layer/WMSLayerTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/gui/layer/WMSLayerTest.java	(revision 11166)
+++ trunk/test/unit/org/openstreetmap/josm/gui/layer/WMSLayerTest.java	(revision 11168)
@@ -38,3 +38,11 @@
         }
     }
+
+    /**
+     * Non-regression test for <a href="https://josm.openstreetmap.de/ticket/13828">Bug #13828</a>.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testTicket13828() {
+        new WMSLayer(new ImageryInfo("TMS", "http://203.159.29.217/try2/{z}/{x}/{y}.png"));
+    }
 }