Index: trunk/test/unit/org/openstreetmap/josm/data/validation/tests/DuplicateNodeTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/validation/tests/DuplicateNodeTest.java	(revision 11003)
+++ trunk/test/unit/org/openstreetmap/josm/data/validation/tests/DuplicateNodeTest.java	(revision 11007)
@@ -9,4 +9,7 @@
 import org.openstreetmap.josm.data.osm.DataSet;
 import org.openstreetmap.josm.data.osm.Node;
+import org.openstreetmap.josm.data.osm.Tag;
+import org.openstreetmap.josm.data.osm.Way;
+import org.openstreetmap.josm.data.validation.TestError;
 import org.openstreetmap.josm.gui.progress.NullProgressMonitor;
 import org.openstreetmap.josm.testutils.JOSMTestRules;
@@ -26,6 +29,43 @@
     public JOSMTestRules test = new JOSMTestRules();
 
+    private static final DuplicateNode TEST = new DuplicateNode();
+
+    private static void doTest(int code, Tag ... tags) {
+        performTest(code, buildDataSet(tags), true);
+    }
+
+    private static void performTest(int code, DataSet ds, boolean fixable) {
+        TEST.startTest(NullProgressMonitor.INSTANCE);
+        TEST.visit(ds.allPrimitives());
+        TEST.endTest();
+
+        assertEquals(1, TEST.getErrors().size());
+        TestError error = TEST.getErrors().iterator().next();
+        assertEquals(code, error.getCode());
+        assertEquals(fixable, error.isFixable());
+    }
+
+    private static DataSet buildDataSet(Tag... tags) {
+        DataSet ds = new DataSet();
+
+        Node a = new Node(new LatLon(10.0, 5.0));
+        Node b = new Node(new LatLon(10.0, 5.0));
+        ds.addPrimitive(a);
+        ds.addPrimitive(b);
+
+        if (tags.length > 0) {
+            Way parent = new Way();
+            parent.addNode(a);
+            parent.addNode(b);
+            for (Tag tag : tags) {
+                parent.put(tag);
+            }
+            ds.addPrimitive(parent);
+        }
+        return ds;
+    }
+
     /**
-     * Test of "Duplicate node" validation test.
+     * Test of "Duplicate node" validation test - different tag sets.
      */
     @Test
@@ -38,10 +78,88 @@
         ds.addPrimitive(b);
 
-        DuplicateNode test = new DuplicateNode();
-        test.startTest(NullProgressMonitor.INSTANCE);
-        test.visit(ds.allPrimitives());
-        test.endTest();
+        a.put("foo", "bar");
+        b.put("bar", "foo");
 
-        assertEquals(1, test.getErrors().size());
+        performTest(DuplicateNode.DUPLICATE_NODE, ds, false);
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - mixed case.
+     */
+    @Test
+    public void testDuplicateNodeMixed() {
+        doTest(DuplicateNode.DUPLICATE_NODE_MIXED, new Tag("building", "foo"), new Tag("highway", "bar"));
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - other case.
+     */
+    @Test
+    public void testDuplicateNodeOther() {
+        doTest(DuplicateNode.DUPLICATE_NODE_OTHER);
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - building case.
+     */
+    @Test
+    public void testDuplicateNodeBuilding() {
+        doTest(DuplicateNode.DUPLICATE_NODE_BUILDING, new Tag("building", "foo"));
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - boundary case.
+     */
+    @Test
+    public void testDuplicateNodeBoundary() {
+        doTest(DuplicateNode.DUPLICATE_NODE_BOUNDARY, new Tag("boundary", "foo"));
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - highway case.
+     */
+    @Test
+    public void testDuplicateNodeHighway() {
+        doTest(DuplicateNode.DUPLICATE_NODE_HIGHWAY, new Tag("highway", "foo"));
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - landuse case.
+     */
+    @Test
+    public void testDuplicateNodeLanduse() {
+        doTest(DuplicateNode.DUPLICATE_NODE_LANDUSE, new Tag("landuse", "foo"));
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - natural case.
+     */
+    @Test
+    public void testDuplicateNodeNatural() {
+        doTest(DuplicateNode.DUPLICATE_NODE_NATURAL, new Tag("natural", "foo"));
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - power case.
+     */
+    @Test
+    public void testDuplicateNodePower() {
+        doTest(DuplicateNode.DUPLICATE_NODE_POWER, new Tag("power", "foo"));
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - railway case.
+     */
+    @Test
+    public void testDuplicateNodeRailway() {
+        doTest(DuplicateNode.DUPLICATE_NODE_RAILWAY, new Tag("railway", "foo"));
+    }
+
+    /**
+     * Test of "Duplicate node" validation test - waterway case.
+     */
+    @Test
+    public void testDuplicateNodeWaterway() {
+        doTest(DuplicateNode.DUPLICATE_NODE_WATERWAY, new Tag("waterway", "foo"));
     }
 }