@Test
@SuppressWarnings("deprecation")
public void testForeignClass() {

  SortedMapWritable inMap = new SortedMapWritable();
  inMap.put(new Text("key"), new UTF8("value"));
  inMap.put(new Text("key2"), new UTF8("value2"));
  SortedMapWritable outMap = new SortedMapWritable(inMap);
  SortedMapWritable copyOfCopy = new SortedMapWritable(outMap);
  assertEquals(1, copyOfCopy.getNewClasses());
}