Index: trunk/test/unit/org/openstreetmap/josm/data/osm/MultipolygonBuilderTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/osm/MultipolygonBuilderTest.java	(revision 9479)
+++ trunk/test/unit/org/openstreetmap/josm/data/osm/MultipolygonBuilderTest.java	(revision 9480)
@@ -1,4 +1,6 @@
 // License: GPL. For details, see LICENSE file.
 package org.openstreetmap.josm.data.osm;
+
+import static org.junit.Assert.assertNull;
 
 import java.io.FileInputStream;
@@ -42,5 +44,5 @@
             DataSet ds = OsmReader.parseDataSet(Compression.BZIP2.getUncompressedInputStream(is), null);
             for (Relation r : ds.getRelations()) {
-                new MultipolygonBuilder().makeFromWays(r.getMemberPrimitives(Way.class));
+                assertNull(new MultipolygonBuilder().makeFromWays(r.getMemberPrimitives(Way.class)));
             }
         }