It appears lambdas are not triggered from items being pushed to SQS if [SendMessageBatch](https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_SendMessageBatch.html) is used instead of [SendMessage](https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_SendMessage.html)
executor.cleanup()
        self.assertEqual(len(executor.get_all_container_names()), 0)
        
        testutil.create_lambda_function(
            func_name=func_name, handler_file=TEST_LAMBDA_ENV, libs=TEST_LAMBDA_LIBS,
            runtime=LAMBDA_RUNTIME_PYTHON27, envvars={'Hello': 'World'})
        self.assertEqual(len(executor.get_all_container_names()), 0)
        self.assertDictEqual(executor.function_invoke_times, {})
        
        durations = []
        num_iterations = 3
        for i in range(0, num_iterations + 1):
            prev_invoke_time = None
            if i > 0:
                prev_invoke_time = executor.function_invoke_times[func_arn]
            start_time = time.time()
            self.lambda_client.invoke(FunctionName=func_name, Payload=b'{}')
            duration = time.time() - start_time
            self.assertEqual(len(executor.get_all_container_names()), 1)
            
            if i > 0:
                self.assertGreater(executor.function_invoke_times[func_arn], prev_invoke_time)
            else:
                self.assertGreater(executor.function_invoke_times[func_arn], 0)
            durations.append(duration)
        
        for i in range(1, num_iterations + 1):
            self.assertLess(durations[i], durations[0])
        status = executor.get_docker_container_status(func_arn)