/** Confirm that the clone is independent of the original. */
 public void testCloneIndependence() {
   DefaultKeyedValueDataset d1 = new DefaultKeyedValueDataset("Key", new Double(10.0));
   DefaultKeyedValueDataset d2 = null;
   try {
     d2 = (DefaultKeyedValueDataset) d1.clone();
   } catch (CloneNotSupportedException e) {
     System.err.println("Failed to clone.");
   }
   assertTrue(d1.equals(d2));
   d2.updateValue(new Double(99.9));
   assertFalse(d1.equals(d2));
   d2.updateValue(new Double(10.0));
   assertTrue(d1.equals(d2));
 }