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diff --git a/das-java/branches/das-java-beta1/rdb/src/test/java/org/apache/tuscany/das/rdb/test/GraphMergeTests.java b/das-java/branches/das-java-beta1/rdb/src/test/java/org/apache/tuscany/das/rdb/test/GraphMergeTests.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.das.rdb.test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.das.rdb.Command;
+import org.apache.tuscany.das.rdb.ConfigHelper;
+import org.apache.tuscany.das.rdb.DAS;
+import org.apache.tuscany.das.rdb.merge.impl.GraphMerger;
+import org.apache.tuscany.das.rdb.test.customer.Customer;
+import org.apache.tuscany.das.rdb.test.customer.CustomerFactory;
+import org.apache.tuscany.das.rdb.test.data.CustomerData;
+import org.apache.tuscany.das.rdb.test.data.OrderData;
+import org.apache.tuscany.das.rdb.test.framework.DasTest;
+import org.apache.tuscany.sdo.util.SDOUtil;
+
+import commonj.sdo.DataObject;
+
+public class GraphMergeTests extends DasTest {
+
+    protected void setUp() throws Exception {
+        super.setUp();
+
+        new CustomerData(getAutoConnection()).refresh();
+        new OrderData(getAutoConnection()).refresh();
+
+    }
+
+    public void testCreateEmptyGraph() throws Exception {
+        String typeUri = "http:///org.apache.tuscany.das.rdb.test/customer.xsd";
+        SDOUtil.registerStaticTypes(CustomerFactory.class);
+        ConfigHelper helper = new ConfigHelper();
+        helper.setDataObjectModel(typeUri);
+        DataObject graph = new GraphMerger().emptyGraph(helper.getConfig());
+        assertEquals(0, graph.getList("Customer").size());
+        assertEquals(0, graph.getList("AnOrder").size());
+
+    }
+
+    public void testCreateEmptyGraphAndAddCustomer() throws Exception {
+        String typeUri = "http:///org.apache.tuscany.das.rdb.test/customer.xsd";
+        SDOUtil.registerStaticTypes(CustomerFactory.class);
+        ConfigHelper helper = new ConfigHelper();
+        helper.setDataObjectModel(typeUri);
+        helper.addTable("CUSTOMER", "Customer");
+        helper.addPrimaryKey("CUSTOMER.ID");
+
+        DataObject graph = new GraphMerger().emptyGraph(helper.getConfig());
+        Customer c = (Customer) graph.createDataObject("Customer");
+        c.setID(4000);
+        c.setLastName("Smith");
+        c.setAddress("400 Fourth Street");
+
+        DAS das = DAS.FACTORY.createDAS(helper.getConfig(), getConnection());
+        das.applyChanges(graph);
+
+        Command cmd = das.createCommand("select * from CUSTOMER order by ID desc");
+        graph = cmd.executeQuery();
+        assertEquals(6, graph.getList("Customer").size());
+        assertEquals("Smith", graph.getDataObject("Customer[1]").getString("lastName"));
+        assertEquals("400 Fourth Street", graph.getDataObject("Customer[1]").getString("address"));
+
+    }
+
+    public void testSingleTableMerge() throws Exception {
+        DAS das = DAS.FACTORY.createDAS(getConnection());
+        Command select = das.createCommand("Select ID, LASTNAME, ADDRESS from CUSTOMER where ID <= ?");
+        select.setParameter(1, "3");
+        DataObject graph1 = select.executeQuery();
+        assertEquals(3, graph1.getList("CUSTOMER").size());
+
+        select.setParameter(1, "5");
+        DataObject graph2 = select.executeQuery();
+        assertEquals(5, graph2.getList("CUSTOMER").size());
+
+        GraphMerger merger = new GraphMerger();
+        merger.addPrimaryKey("CUSTOMER.ID");
+        DataObject mergedGraph = merger.merge(graph1, graph2);
+
+        assertEquals(5, mergedGraph.getList("CUSTOMER").size());
+    }
+
+    public void testSingleTableMergeThreeGraphs() throws Exception {
+        DAS das = DAS.FACTORY.createDAS(getConnection());
+        Command select = das.createCommand("Select ID, LASTNAME, ADDRESS from CUSTOMER where ID <= ?");
+        select.setParameter(1, "3");
+        DataObject graph1 = select.executeQuery();
+        assertEquals(3, graph1.getList("CUSTOMER").size());
+
+        select.setParameter(1, "4");
+        DataObject graph2 = select.executeQuery();
+        assertEquals(4, graph2.getList("CUSTOMER").size());
+
+        select.setParameter(1, "5");
+        DataObject graph3 = select.executeQuery();
+        assertEquals(5, graph3.getList("CUSTOMER").size());
+
+        GraphMerger merger = new GraphMerger();
+        merger.addPrimaryKey("CUSTOMER.ID");
+        List graphs = new ArrayList();
+        graphs.add(graph1);
+        graphs.add(graph2);
+        graphs.add(graph3);
+        DataObject mergedGraph = merger.merge(graphs);
+
+        assertEquals(5, mergedGraph.getList("CUSTOMER").size());
+
+    }
+
+    public void testMultiTableMerge2() throws Exception {
+        DAS das = DAS.FACTORY.createDAS(getConfig("CustomersOrdersConfig.xml"), getConnection());
+        // Read some customers and related orders
+        Command select = das.createCommand("SELECT * FROM CUSTOMER LEFT JOIN ANORDER ON " 
+                + "CUSTOMER.ID = ANORDER.CUSTOMER_ID where CUSTOMER.ID = ?");
+
+        select.setParameter(1, Integer.valueOf(1));
+        DataObject graph1 = select.executeQuery();
+
+        DataObject customer = (DataObject) graph1.getList("CUSTOMER").get(0);
+        assertEquals(2, customer.getList("orders").size());
+
+        select.setParameter(1, Integer.valueOf(2));
+        DataObject graph2 = select.executeQuery();
+        DataObject customer2 = (DataObject) graph2.getList("CUSTOMER").get(0);
+        assertEquals(1, graph2.getList("CUSTOMER").size());
+        assertEquals(1, customer2.getList("orders").size());
+        assertEquals(2, customer2.getInt("ID"));
+
+        GraphMerger merger = new GraphMerger();
+        merger.addPrimaryKey("CUSTOMER.ID");
+        merger.addPrimaryKey("ANORDER.ID");
+        DataObject mergedGraph = merger.merge(graph1, graph2);
+
+        assertEquals(3, mergedGraph.getList("ANORDER").size());
+        assertEquals(2, mergedGraph.getList("CUSTOMER").size());
+
+        DataObject mergedCustomer = (DataObject) mergedGraph.getList("CUSTOMER").get(1);
+        assertEquals(2, mergedCustomer.getInt("ID"));
+        assertEquals(1, mergedCustomer.getList("orders").size());
+        DataObject mergedOrder = (DataObject) mergedCustomer.getList("orders").get(0);
+        assertEquals(4, mergedOrder.getInt("ID"));
+
+    }
+
+    public void testMultiTableAppendSingleTable2() throws Exception {
+        DAS das = DAS.FACTORY.createDAS(getConfig("CustomersOrdersConfig.xml"), getConnection());
+        // Read some customers and related orders
+        Command select = das.createCommand("SELECT * FROM CUSTOMER LEFT JOIN ANORDER ON " 
+                + "CUSTOMER.ID = ANORDER.CUSTOMER_ID where CUSTOMER.ID = ?");
+
+        select.setParameter(1, Integer.valueOf(1));
+        DataObject graph1 = select.executeQuery();
+
+        DataObject customer = (DataObject) graph1.getList("CUSTOMER").get(0);
+        assertEquals(2, customer.getList("orders").size());
+
+        DAS das2 = DAS.FACTORY.createDAS(getConnection());
+        Command select2 = das2.createCommand("select * from ANORDER");
+        DataObject graph2 = select2.executeQuery();
+        assertEquals(4, graph2.getList("ANORDER").size());
+
+        GraphMerger merger = new GraphMerger();
+        merger.addPrimaryKey("CUSTOMER.ID");
+        merger.addPrimaryKey("ANORDER.ID");
+        DataObject mergedGraph = merger.merge(graph1, graph2);
+        assertEquals(4, mergedGraph.getList("ANORDER").size());
+        assertEquals(1, mergedGraph.getList("CUSTOMER").size());
+    }
+
+}