diff --git a/test/unit/org/openstreetmap/josm/plugins/mapwithai/data/validation/tests/ConnectingNodeInformationTestTest.java b/test/unit/org/openstreetmap/josm/plugins/mapwithai/data/validation/tests/ConnectingNodeInformationTestTest.java
new file mode 100644
index 0000000..9c639be
--- /dev/null
+++ b/test/unit/org/openstreetmap/josm/plugins/mapwithai/data/validation/tests/ConnectingNodeInformationTestTest.java
@@ -0,0 +1,53 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.plugins.mapwithai.data.validation.tests;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.openstreetmap.josm.TestUtils;
+import org.openstreetmap.josm.data.coor.LatLon;
+import org.openstreetmap.josm.data.osm.DataSet;
+import org.openstreetmap.josm.data.osm.Node;
+import org.openstreetmap.josm.data.osm.Relation;
+import org.openstreetmap.josm.data.osm.Way;
+import org.openstreetmap.josm.plugins.mapwithai.backend.commands.conflation.ConnectedCommand;
+import org.openstreetmap.josm.plugins.mapwithai.backend.commands.conflation.DuplicateCommand;
+import org.openstreetmap.josm.testutils.JOSMTestRules;
+
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
+
+public class ConnectingNodeInformationTestTest {
+    /**
+     * Setup test.
+     */
+    @Rule
+    @SuppressFBWarnings(value = "URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD")
+    public JOSMTestRules rule = new JOSMTestRules().projection();
+
+    @Test
+    public void testGetBadData() {
+        DataSet ds = new DataSet();
+        Way way = TestUtils.newWay("highway=residential", new Node(new LatLon(0, 0)), new Node(new LatLon(1, 1)));
+        way.getNodes().forEach(ds::addPrimitive);
+        ds.addPrimitive(way);
+        ds.addPrimitive(new Relation());
+        ConnectingNodeInformationTest test = new ConnectingNodeInformationTest();
+        test.startTest(null);
+        test.visit(ds.allPrimitives());
+        assertTrue(test.getErrors().isEmpty());
+        way.firstNode().put(DuplicateCommand.DUPE_KEY, "n123");
+        test.visit(ds.allPrimitives());
+        assertEquals(1, test.getErrors().size());
+        assertEquals(way.firstNode(), test.getErrors().get(0).getPrimitives().iterator().next());
+        test.clear();
+
+        way.firstNode().put(DuplicateCommand.DUPE_KEY, null);
+        way.put(ConnectedCommand.CONN_KEY, "w1,w2,n123");
+        test.visit(ds.allPrimitives());
+        assertEquals(1, test.getErrors().size());
+        assertEquals(way, test.getErrors().get(0).getPrimitives().iterator().next());
+    }
+
+}