public void CheckAuthorization_NonGuid()
        {
            //arrange / act
            var result = _mainHelper.CheckAuthorization("test");

            //assert
            AssertWithMessage.IsNull(result, "user");
        }
        public void CheckAuthorization_NonExistantGuid()
        {
            var guidString = "ab9767dd-3c56-4750-a669-76564e057f83";
            var guid       = new Guid(guidString);

            //arrange
            _authChecker.Setup(x => x.CheckToken(guid)).Returns(default(User));

            //act
            var result = _mainHelper.CheckAuthorization(guidString);

            //assert
            AssertWithMessage.IsNull(result, "user");
        }