@Test public void testValueIterator(){
  Iterator iterator=kvList.valueIterator();
  Text oldKey=null, oldValue=null;
  for (int i=1; i < 5; i++) {
    Text currentValue=iterator.next();
    Text currentKey=kvList.getCurrentKey();
    Assert.assertEquals("v" + i,currentValue.toString());
    Assert.assertEquals("k" + i,currentKey.toString());
    if (oldKey != null && oldValue != null) {
      Assert.assertTrue(oldKey == currentKey);
      Assert.assertTrue(oldValue == currentValue);
    }
    oldKey=currentKey;
    oldValue=currentValue;
  }
}