def test_group_message(self):
        cool = GroupMessage(self.api_key, self.api_secret)

        ## create group
        response = cool.create_group()
        group_id = response['group_id']
        self.assertIsNotNone(group_id)

        ## group list
        response = cool.get_group_list()
        self.assertIsNotNone(response['list'][0])

        ## add messages
        params = {
            'group_id': group_id,
            'to': '01000000000',
            'from': '01000000000',
            'text': 'TestGroupMessage'
        }
        response = cool.add_messages(params)
        self.assertIsNotNone(response['error_count'])

        ## add messages json
        params = [{
            "from": "01000000000",
            "to": "01000000001",
            "text": "TestGroupMessage"
        }, {
            "from": "01000000000",
            "to": "01000000002",
            "text": "TestGroupMessage"
        }]
        messages = json.dumps(params)
        response = cool.add_messages_json(group_id, messages)
        self.assertIsNotNone(response[0]['error_count'])

        ## get message list
        params = {'group_id': group_id}
        try:
            cool.get_message_list(params)
        except CoolsmsException as e:
            # 404는 메시지 내역이 없는 것이기 때문에 테스트 실패사유가 안됨
            if e.code == 404:
                pass

        ## delete messages
        message_id = 'TESTMESSAGEID'
        response = cool.delete_messages(group_id, message_id)
        self.assertIsNotNone(response['error_count'])

        ## send
        try:
            cool.send(group_id)
        except CoolsmsException as e:
            # 402는 잔액부족이기 때문에 테스트 실패사유가 안됨
            if e.code == 402:
                pass
    params['to'] = '01000000000' # Recipients Number '01000000000,01000000001'
    params['from'] = '01000000000' # Sender number
    params['text'] = 'Test Message' # Message
    params["group_id"] = "GID57A82D462CBBF" # Group ID

    # Optional parameters for your own needs
    # params["image_id"] = "image_id" # image_id. type must be set as 'MMS'
    # params["refname"] = "" # Reference name
    # params["country"] = "82" # Korea(82) Japan(81) America(1) China(86) Default is Korea
    # params["datetime"] = "20140106153000" # Format must be(YYYYMMDDHHMISS) 2014 01 06 15 30 00 (2014 Jan 06th 3pm 30 00)
    # params["subject"] = "Message Title" # set msg title for LMS and MMS
    # params["delay"] = "10") # '0~20' delay messages
    # params["sender_key"] = "5554025sa8e61072frrrd5d4cc2rrrr65e15bb64" # 알림톡 사용을 위해 필요합니다. 신청방법 : http://www.coolsms.co.kr/AboutAlimTalk
    # params["template_code"] = "C004" # 알림톡 template code 입니다. 자세한 설명은 http://www.coolsms.co.kr/AboutAlimTalk을 참조해주세요.

    cool = GroupMessage(api_key, api_secret)

    try:
        response = cool.add_messages(params)
        print("Success Count : %s" % response['success_count'])
        print("Error Count : %s" % response['error_count'])

        if "error_list" in response:
            print("Error List : %s" % response['error_list'])

    except CoolsmsException as e:
        print("Error Code : %s" % e.code)
        print("Error Message : %s" % e.msg)

    sys.exit()