Index: trunk/test/unit/org/openstreetmap/josm/data/osm/DataSetTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/osm/DataSetTest.java	(revision 17280)
+++ trunk/test/unit/org/openstreetmap/josm/data/osm/DataSetTest.java	(revision 17283)
@@ -12,6 +12,6 @@
 
 import org.junit.Assert;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
-import org.junit.jupiter.api.Test;
 import org.openstreetmap.josm.TestUtils;
 import org.openstreetmap.josm.data.Bounds;
@@ -168,12 +168,18 @@
         Node n2 = new Node(2);
         Node n3 = new Node(3);
+        Node n4 = new Node(4);
         Way w1 = new Way(1);
-        w1.setNodes(Arrays.asList(n1, n2, n3, n1));
+        w1.setNodes(Arrays.asList(n1, n2, n3, n4, n1));
+        w1.setIncomplete(false);
+        assertEquals(5, w1.getNodesCount());
+        assertTrue(w1.isClosed());
         ds.addPrimitive(n1);
         ds.addPrimitive(n2);
         ds.addPrimitive(n3);
+        ds.addPrimitive(n4);
         ds.addPrimitive(w1);
         ds.unlinkNodeFromWays(n1);
-        assertEquals(2, w1.getRealNodesCount());
+        assertTrue(w1.isClosed());
+        assertEquals(4, w1.getNodesCount());
     }