--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/tests/gov/nasa/jpf/test/mc/basic/OVHeapTest.java	Fri Jan 23 10:14:01 2015 -0800
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2014, United States Government, as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All rights reserved.
+ *
+ * The Java Pathfinder core (jpf-core) platform is licensed 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 gov.nasa.jpf.test.mc.basic;
+
+import org.junit.Test;
+
+import gov.nasa.jpf.util.test.TestJPF;
+import gov.nasa.jpf.vm.Verify;
+
+/**
+ * unit test for OVHeap
+ */
+public class OVHeapTest extends TestJPF {
+  
+  static int getReferenceValue (Object o) {
+    int h = System.identityHashCode(o);
+    return h ^ 0xABCD;  // revert the ABCD hash component
+  }
+
+  static void checkRef (String msg, String key, int ref) {
+    System.out.printf("%s ,object: %s, ref: %d", msg, key, ref);
+    
+    int v = Verify.getValue(key);
+    if (v == Verify.NO_VALUE) {
+      Verify.putValue(key, ref);
+      System.out.println(" new");
+    } else {
+      if (v == ref) {
+        System.out.println(" seen");
+      } else {
+        fail("different reference values, had:" + v + ", new:" + ref);
+      }
+    }
+  }
+  
+  static class X {
+    String id;
+    
+    X (String id){
+      this.id = id;
+    }
+  }
+  
+  static class Y extends X {
+    Y (String id){
+      super(id);
+    }
+  }
+  
+  X allocX (String id) {
+    return new X(id);
+  }
+    
+  @Test
+  public void testSGOIDs() {
+    if (verifyNoPropertyViolation("+vm.heap.class=.vm.OVHeap")) {
+      Thread t = new Thread() {
+        @Override
+		public void run() {
+          Class<?> cls = X.class;
+          checkRef("from T ", "X.class", getReferenceValue(cls));
+          
+          X x1 = new X("t-x1");
+          checkRef("from T ", x1.id, getReferenceValue(x1));
+          
+          Thread.yield(); // CG #3
+          
+          Y y1 = new Y("t-y1");
+          checkRef("from T ", y1.id, getReferenceValue(y1));
+        }
+      };
+      
+      t.start();  // CG #1
+      
+      Class<?> clsY = Y.class;
+      checkRef("from M ", "Y.class", getReferenceValue(clsY));
+      
+      Class<?> clsX = X.class;
+      checkRef("from M ", "X.class", getReferenceValue(clsX));
+      
+      int n = Verify.getInt(1, 3); // CG #2
+      System.out.println("-- M next X[] arraysize = " + n);
+      X[] xs = new X[n];
+      for (int i=0; i<xs.length; i++) {
+        xs[i] = new X("xs-" + i);
+        checkRef("from M ", xs[i].id, getReferenceValue(xs[i]));
+      }
+      
+      Y y1 = new Y("m-y1");
+      checkRef("from M ", y1.id, getReferenceValue(y1));
+      
+      X x1 = new Y("m-x1");
+      checkRef("from M ", x1.id, getReferenceValue(x1));
+    }
+  }
+}