public void TestNullQueryParameters()
        {
            var builder = new HttpWebRequestBuilder()
            {
                BaseUri = new Uri("http://www.example.com"),
                Path = "",
            };

            builder.AddParameter(RequestParameterType.Query, "q", null);
            builder.AddParameter(RequestParameterType.Query, "p", String.Empty);

            Assert.That(builder.BuildUri().AbsoluteUri, Is.EqualTo("http://www.example.com/"));
        }