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diff --git a/das-java/branches/das-java-M2/rdb/src/test/java/org/apache/tuscany/das/rdb/test/OneToOneRelationshipTests.java b/das-java/branches/das-java-M2/rdb/src/test/java/org/apache/tuscany/das/rdb/test/OneToOneRelationshipTests.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 org.apache.tuscany.das.rdb.Command;
+import org.apache.tuscany.das.rdb.DAS;
+import org.apache.tuscany.das.rdb.test.data.CompanyData;
+import org.apache.tuscany.das.rdb.test.data.CompanyEmpData;
+import org.apache.tuscany.das.rdb.test.data.EmployeeData;
+import org.apache.tuscany.das.rdb.test.framework.DasTest;
+
+import commonj.sdo.DataObject;
+
+public class OneToOneRelationshipTests extends DasTest {
+
+    protected void setUp() throws Exception {
+        super.setUp();
+        new CompanyData(getAutoConnection()).refresh();
+        new EmployeeData(getAutoConnection()).refresh();
+        new CompanyEmpData(getAutoConnection()).refresh();
+    }
+
+    protected void tearDown() throws Exception {
+        super.tearDown();
+    }
+
+    /**
+     * Read Company and traverse to EOTM
+     */
+    public void test1() throws Exception {
+
+        DAS das = DAS.FACTORY.createDAS(getConfig("CompanyEmployeeConfig.xml"), getConnection());
+
+        Command read = das.getCommand("get companies with employee of the month");
+        DataObject root = read.executeQuery();
+        DataObject employee = root.getDataObject("COMPANY[1]/company->employee_opposite");
+
+        assertEquals("Mary Smith", employee.getString("NAME"));
+    }
+
+    /**
+     * Read Employee and traverse to Company
+     */
+    public void test2() throws Exception {
+
+        DAS das = DAS.FACTORY.createDAS(getConfig("CompanyEmployeeConfig.xml"), getConnection());
+
+        Command read = das.getCommand("get named employee with company");
+        read.setParameter(1, "Mary Smith");
+        DataObject root = read.executeQuery();
+        DataObject company = root.getDataObject("EMPLOYEE[1]/company->employee");
+
+        assertEquals("ACME Publishing", company.getString("NAME"));
+    }
+
+    /**
+     * Un-assign employee O' month
+     */
+    public void test3() throws Exception {
+
+        DAS das = DAS.FACTORY.createDAS(getConfig("CompanyEmployeeConfig.xml"), getConnection());
+
+        Command read = das.getCommand("get companies with employee of the month");
+        DataObject root = read.executeQuery();
+        DataObject company = root.getDataObject("COMPANY[1]");
+        company.setDataObject("company->employee_opposite", null);
+        assertNull(company.getDataObject("company->employee_opposite"));
+
+        //Flush changes
+        das.applyChanges(root);
+
+        //Verify
+        root = read.executeQuery();
+        company = root.getDataObject("COMPANY[1]");
+        assertNull(company.getDataObject("company->employee_opposite"));
+    }
+
+    /**
+     * Delete employee O' month
+     */
+    public void test4() throws Exception {
+
+        DAS das = DAS.FACTORY.createDAS(getConfig("CompanyEmployeeConfig.xml"), getConnection());
+
+        Command read = das.getCommand("get companies with employee of the month");
+        DataObject root = read.executeQuery();
+        DataObject company = root.getDataObject("COMPANY[1]");
+        DataObject employee = company.getDataObject("company->employee_opposite");
+        employee.delete();
+        assertNull(company.getDataObject("company->employee_opposite"));
+
+        //Flush changes
+        das.applyChanges(root);
+
+        //Verify
+        root = read.executeQuery();
+        company = root.getDataObject("COMPANY[1]");
+        assertNull(company.getDataObject("company->employee_opposite"));
+    }
+
+    /**
+     * Add new employee O' month
+     */
+    public void test5() throws Exception {
+
+        DAS das = DAS.FACTORY.createDAS(getConfig("CompanyEmployeeConfig.xml"), getConnection());
+
+        Command read = das.getCommand("get companies with employee of the month");
+        DataObject root = read.executeQuery();
+        DataObject company = root.getDataObject("COMPANY[1]");
+
+        //Create a new employee
+        DataObject employee = root.createDataObject("EMPLOYEE");
+        employee.setString("NAME", "Joe Hotshot");
+
+        //Assigne a EOTM
+        //Strangely this statement results in "Could not find relationships" error
+        //although "company.setDataObject("company->employee_opposite", null);" dos not   
+        company.setDataObject("company->employee_opposite", employee);
+
+        //Flush changes
+        das.applyChanges(root);
+
+        //Verify
+        root = read.executeQuery();
+
+        employee = root.getDataObject("COMPANY[1]/company->employee_opposite");
+
+        assertEquals("Joe Hotshot", employee.getString("NAME"));
+
+    }
+
+    public void testRestrictedOneToOneRelationship() throws Exception {
+        DAS das = DAS.FACTORY.createDAS(getConfig("OneToOneRestrictedConfig.xml"), getConnection());
+
+        Command read = das.getCommand("get named employee with company");
+        read.setParameter(1, "Mary Smith");
+        DataObject root = read.executeQuery();
+        DataObject mary = root.getDataObject("EMPLOYEE[1]");
+        DataObject company = mary.getDataObject("company");
+
+        DataObject bob = root.createDataObject("EMPLOYEE");
+        bob.setString("NAME", "bob");
+        bob.setString("SN", "E0005");
+        bob.setInt("MANAGER", 0);
+
+        bob.setDataObject("company", company);
+
+        try {
+            das.applyChanges(root);
+            fail("Relationship modification should not be allowed.");
+        } catch (RuntimeException ex) {
+            assertEquals("Can not modify a one to one relationship that is key restricted", ex.getMessage());
+        }
+        assertEquals("ACME Publishing", company.getString("NAME"));
+
+    }
+}