Index: trunk/test/unit/org/openstreetmap/josm/data/osm/OsmPrimitiveKeyHandlingTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/osm/OsmPrimitiveKeyHandlingTest.java	(revision 17582)
+++ trunk/test/unit/org/openstreetmap/josm/data/osm/OsmPrimitiveKeyHandlingTest.java	(revision 17584)
@@ -163,4 +163,5 @@
         assertEquals(expectedSize, p.getKeys().size());
         assertEquals(expectedSize, p.keySet().size());
+        assertEquals(expectedSize, p.keys().count());
         assertEquals(expectedSize, p.getKeys().entrySet().size());
         assertEquals(expectedSize, p.getKeys().keySet().size());