Index: trunk/test/unit/org/openstreetmap/josm/data/validation/tests/LanesTest.groovy
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/validation/tests/LanesTest.groovy	(revision 6605)
+++ trunk/test/unit/org/openstreetmap/josm/data/validation/tests/LanesTest.groovy	(revision 6606)
@@ -49,3 +49,8 @@
         assert lanes.errors.isEmpty()
     }
+
+    void test7() {
+        lanes.check(TestUtils.createPrimitive("way lanes=3 lanes:forward=3 lanes:backward=7"))
+        assert lanes.errors.get(0).getMessage() == "Number of lanes:forward+lanes:backward greater than lanes"
+    }
 }