public async Task GetMissionList_RequestSuccessful_ReturnMissionInfos()
        {
            var json = "[ { \"AdId\": \"abc\" }, { \"AdId\": \"abc\" } ]";

            _requestor.Setup(g => g.GetRequest(It.IsAny <string>()))
            .Returns(Task.FromResult(json));

            var result = await _missionService.GetMissionList(It.IsAny <string>());

            Assert.That(result.FirstOrDefault().AdId, Is.EqualTo("abc"));
        }