@Test
 public void updateItemInTableTest() {
   AttributeValue hash = putItemInDb();
   Map<String, AttributeValueUpdate> attrToUp = new HashMap<String, AttributeValueUpdate>();
   AttributeValueUpdate update = new AttributeValueUpdate();
   update.setAction("PUT");
   update.setValue(hash);
   attrToUp.put("updated", update);
   Key key = new Key(hash);
   UpdateItemRequest request = new UpdateItemRequest(tableName, key, attrToUp);
   UpdateItemResult res = getClient().updateItem(request);
   Assert.assertNotNull(res);
   Assert.assertNotNull(res.getAttributes());
 }
 @Test
 public void updateItemWithoutKeyTest() {
   AttributeValue hash = putItemInDb();
   Map<String, AttributeValueUpdate> attrToUp = new HashMap<String, AttributeValueUpdate>();
   AttributeValueUpdate update = new AttributeValueUpdate();
   update.setAction("PUT");
   update.setValue(hash);
   attrToUp.put("updated", update);
   Key key = new Key(hash);
   UpdateItemRequest request = new UpdateItemRequest();
   request.setTableName(tableName);
   request.setAttributeUpdates(attrToUp);
   try {
     getClient().updateItem(request);
     Assert.assertTrue(false); // Should have thrown an exception
   } catch (AmazonServiceException ase) {
   }
 }