HttpWebRequest ServerCertificateValidationCallback and connection reuse

gistfile1.cs

using System;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using Xunit;

namespace CertificateValidationAndConnections
{
    public class CertificateValidationAndConnectionsFacts
    {
        private const int NoOfRequests = 10;

        private static readonly Uri[] RequestUris = new []
        {
            new Uri("https://github.com/webapibook"),   
            new Uri("https://groups.google.com/forum/#!forum/webapibook")
        };

        static CertificateValidationAndConnectionsFacts()
        {
            ServicePointManager.DefaultConnectionLimit = 100;
        }

        public class UsingStaticValidator
        {
            public void Run()
            {
                var hwr = WebRequest.Create(RequestUris[0]) as HttpWebRequest;
                hwr.ServerCertificateValidationCallback = StaticValidator;
                var res = hwr.GetResponse();
                res.GetResponseStream().Close();
            }

            private static bool StaticValidator(object sender, X509Certificate certificate, X509Chain chain,
                SslPolicyErrors sslpolicyerrors)
            {
                return sslpolicyerrors == SslPolicyErrors.None;
            }
        }

        [Fact]
        public void ConnectionsAreReused()
        {
            for (var i = 0; i < NoOfRequests; ++i)
            {
                new UsingStaticValidator().Run();
            }
            // connection reuse: only one connection for all requests
            Assert.Equal(1, ServicePointManager.FindServicePoint(RequestUris[0]).CurrentConnections);
        }

        public class UsingInstanceValidator
        {
            public void Run()
            {
                var hwr = WebRequest.Create(RequestUris[1]) as HttpWebRequest;
                hwr.ServerCertificateValidationCallback = InstanceValidator;
                var res = hwr.GetResponse();
                res.GetResponseStream().Close();
            }

            private bool InstanceValidator(object sender, X509Certificate certificate, X509Chain chain,
                SslPolicyErrors sslpolicyerrors)
            {
                return sslpolicyerrors == SslPolicyErrors.None;
            }
        }

        [Fact]
        public void ConnectionsAreNotReused()
        {
            for (var i = 0; i < NoOfRequests; ++i)
            {
                new UsingInstanceValidator().Run();
            }
            // no connection reuse: one new connection per request
            Assert.Equal(NoOfRequests, ServicePointManager.FindServicePoint(RequestUris[1]).CurrentConnections);
        }
    }
}