public void GetQueryStringPostfixTest()
        {
            var queryStringParametersList = new QueryStringParametersList
            {
                { "1", "1" },
                { "2", "2" },
                { "3", "3" }
            };

            var actual   = queryStringParametersList.GetQueryStringPostfix();
            var expected = string.Join("&", queryStringParametersList.Select(x => Uri.EscapeDataString(x.Key) + "=" + Uri.EscapeDataString(x.Value)));

            Assert.IsNotNull(actual);
            Assert.AreEqual(expected, actual);
        }