public void UserObject_PassingObject_ReturnsJsonUserString()
        {
            //arrange
            User user = new User()
            {
                Id = 100, Username = "******", Password = "******"
            };

            //act
            string json = JsonHelpers.ConvertToJson(user);

            //assert
            StringAssert.Contains(user.Id.ToString(CultureInfo.InvariantCulture), json);
            StringAssert.Contains(user.Username, json);
            StringAssert.Contains(user.Password, json);
        }