@Test
 public void testRemovePutCommit() throws Exception {
   table.put("Key", "Value");
   table.commit();
   table.remove("Key");
   table.put("Key", "Value");
   Assert.assertEquals(0, table.commit());
 }
 @Test
 public void testPutCommit() throws Exception {
   table.put("Key1", "Value1");
   table.put("Key2", "Value2");
   table.put("Key3", "Value3");
   Assert.assertEquals(3, table.commit());
 }