Index: trunk/test/unit/org/openstreetmap/josm/data/validation/tests/RelationCheckerTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/validation/tests/RelationCheckerTest.java	(revision 18373)
+++ trunk/test/unit/org/openstreetmap/josm/data/validation/tests/RelationCheckerTest.java	(revision 18374)
@@ -10,4 +10,5 @@
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
+import org.openstreetmap.josm.TestUtils;
 import org.openstreetmap.josm.data.osm.Node;
 import org.openstreetmap.josm.data.osm.OsmUtils;
@@ -146,7 +147,12 @@
     @Test
     void testBuildingMemberExpression() {
-        Relation r = createRelation("type=building");
-        r.addMember(new RelationMember("outline", new Way()));
-        r.addMember(new RelationMember("part", new Way()));
+        final Relation r = createRelation("type=building");
+        final Way outline = TestUtils.newWay("", new Node(0, 0), new Node(0, 1), new Node(1, 1),
+                new Node(1, 0));
+        outline.addNode(outline.firstNode());
+        final Way part = TestUtils.newWay("", outline.firstNode(), outline.getNode(1), outline.getNode(2),
+                outline.lastNode());
+        r.addMember(new RelationMember("outline", outline));
+        r.addMember(new RelationMember("part", part));
         r.addMember(new RelationMember("level_-12", new Relation())); // fails (old tagging schema, #21048)