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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/readGraph/getPrincipalTypes/GetPrincipalTypesTest3.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/readGraph/getPrincipalTypes/GetPrincipalTypesTest3.java
new file mode 100644
index 000000000..e9baeef00
--- /dev/null
+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/readGraph/getPrincipalTypes/GetPrincipalTypesTest3.java
@@ -0,0 +1,77 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.tests.api.readGraph.getPrincipalTypes;
+
+import java.util.Collection;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.testing.base.WriteReadTest;
+import org.simantics.db.tests.common.Writes;
+
+public class GetPrincipalTypesTest3 extends WriteReadTest {
+
+    private Resource type1;
+    private Resource type2;
+    private Resource type3;
+    private Resource instance1;
+    
+	@Override
+	protected void write(WriteGraph graph) throws DatabaseException {
+
+        type1 = graph.newResource();
+        graph.claim(type1, L0.Inherits, L0.Entity);
+        type2 = graph.newResource();
+        graph.claim(type2, L0.Inherits, L0.Entity);
+        type3 = graph.newResource();
+        graph.claim(type3, L0.Inherits, L0.Entity);
+
+        graph.claim(type3, L0.Asserts, Writes.assertion(graph, L0.Inherits, type1));
+        graph.claim(type3, L0.Asserts, Writes.assertion(graph, L0.Inherits, type2));
+        instance1 = graph.newResource();
+        graph.claim(instance1, L0.InstanceOf, type3);		
+	}
+
+	@Override
+    protected void read(ReadGraph graph) throws DatabaseException {
+    	
+        Collection<Resource> result = graph.getPrincipalTypes(instance1);
+        assertNotNull("Null not allowed", result);
+        int resultsSize = result.size();
+        assertTrue("Null results.", (result != null));
+        assertTrue("Wrong types", (result.contains(type3)));
+        assertTrue("Wrong number of results: " + resultsSize,
+        		(resultsSize == 1));
+    }
+	/*
+	@Override
+    protected void read(ReadGraph graph) throws DatabaseException {
+    	
+        Collection<Resource> results = graph.getSupertypes(instance1);
+        int resultsSize = results.size();
+        assertTrue("Null results.", (results != null));
+        System.out.println(results.contains(L0.Entity) + " " + results.contains(type3)+
+        		" " + results.contains(type1) + " " + results.contains(type2));
+        //Collection<Resource> labels = graph.getObjects(type3, L0.HasLabel);
+        //assertTrue("Wrong type" + labels.toArray()[0], results.contains(type1));
+        assertTrue("Wrong number of results: " + resultsSize,
+        		(resultsSize == 2));
+        //assertTrue(Tests.contains(statements, L0.SupertypeOf, named1));
+        //assertTrue(Tests.contains(statements, L0.SupertypeOf, named2));
+        
+        
+    }
+    */
+    
+}