Index: trunk/test/unit/org/openstreetmap/josm/data/validation/tests/UntaggedNodeTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/validation/tests/UntaggedNodeTest.java	(revision 9604)
+++ trunk/test/unit/org/openstreetmap/josm/data/validation/tests/UntaggedNodeTest.java	(revision 9604)
@@ -0,0 +1,48 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.data.validation.tests;
+
+import static org.CustomMatchers.isEmpty;
+import static org.junit.Assert.assertThat;
+
+import java.io.InputStream;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.openstreetmap.josm.JOSMFixture;
+import org.openstreetmap.josm.TestUtils;
+import org.openstreetmap.josm.data.osm.DataSet;
+import org.openstreetmap.josm.gui.progress.NullProgressMonitor;
+import org.openstreetmap.josm.io.OsmReader;
+
+/**
+ * Unit tests of {@code UntaggedNode} class.
+ */
+public class UntaggedNodeTest {
+
+    private UntaggedNode test;
+
+    /**
+     * Setup test.
+     */
+    @Before
+    public void setUp() {
+        JOSMFixture.createUnitTestFixture().init();
+        test = new UntaggedNode();
+    }
+
+    /**
+     * Non-regression test for <a href="https://josm.openstreetmap.de/ticket/12436">Bug #12436</a>.
+     * @throws Exception if an error occurs
+     */
+    @Test
+    public void testTicket12436() throws Exception {
+        test.initialize();
+        test.startTest(null);
+        try (InputStream fis = TestUtils.getRegressionDataStream(12436, "example.osm")) {
+            final DataSet ds = OsmReader.parseDataSet(fis, NullProgressMonitor.INSTANCE);
+            test.visit(ds.allPrimitives());
+            test.endTest();
+            assertThat(test.getErrors(), isEmpty());
+        }
+    }
+}