SqlConnection timeout test is ported (#26306)

Author: Gene Lee

src/System.Data.SqlClient/tests/FunctionalTests/SqlConnectionBasicTests.cs

@@ -2,9 +2,11 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-
+using System.Collections.Generic;
 using System.Data.Common;
+using System.Diagnostics;
 using System.Reflection;
+using System.Threading;
 using Xunit;
 
 namespace System.Data.SqlClient.Tests
@@ -79,5 +81,97 @@ public void SqlConnectionInvalidParameters()
             Assert.Throws<ArgumentException>(() => new SqlConnection("Timeout=1a;"));
             Assert.Throws<ArgumentException>(() => new SqlConnection("Integrated Security=truee"));
         }
+
+        [Fact]
+        public void ConnectionTimeoutTestWithThread()
+        {
+            int timeoutSec = 5;
+            string connStrNotAvailable = $"Server=tcp:fakeServer,1433;uid=fakeuser;pwd=fakepwd;Connection Timeout={timeoutSec}";
+
+            List<ConnectionWorker> list = new List<ConnectionWorker>();
+            for (int i = 0; i < 10; ++i)
+            {
+                list.Add(new ConnectionWorker(connStrNotAvailable));
+            }
+
+            ConnectionWorker.Start();
+            ConnectionWorker.Stop();
+
+            double theMax = 0;
+            foreach (ConnectionWorker w in list)
+            {
+                if (theMax < w.MaxTimeElapsed)
+                {
+                    theMax = w.MaxTimeElapsed;
+                }
+            }
+
+            int threshold = (timeoutSec + 1) * 1000;
+            Assert.True(theMax < threshold);
+        }
+
+        public class ConnectionWorker
+        {
+            private static ManualResetEventSlim startEvent = new ManualResetEventSlim(false);
+            private static List<ConnectionWorker> workerList = new List<ConnectionWorker>();
+            private ManualResetEventSlim doneEvent = new ManualResetEventSlim(false);
+            private double maxTimeElapsed;
+            private Thread thread;
+            private string connectionString;
+
+            public ConnectionWorker(string connectionString)
+            {
+                workerList.Add(this);
+                this.connectionString = connectionString;
+                thread = new Thread(new ThreadStart(SqlConnectionOpen));
+                thread.Start();
+            }
+
+            public double MaxTimeElapsed
+            {
+                get
+                {
+                    return maxTimeElapsed;
+                }
+            }
+
+            public static void Start()
+            {
+                startEvent.Set();
+            }
+
+            public static void Stop()
+            {
+                foreach (ConnectionWorker w in workerList)
+                {
+                    w.doneEvent.Wait();
+                }
+            }
+
+            public void SqlConnectionOpen()
+            {
+                startEvent.Wait();
+
+                Stopwatch sw = new Stopwatch();
+                using (SqlConnection con = new SqlConnection(connectionString))
+                {
+                    sw.Start();
+                    try
+                    {
+                        con.Open();
+                    }
+                    catch { }
+                    sw.Stop();
+                }
+
+                double elapsed = sw.Elapsed.TotalMilliseconds;
+                if (maxTimeElapsed < elapsed)
+                {
+                    maxTimeElapsed = elapsed;
+                }
+
+                doneEvent.Set();
+            }
+        }
     }
 }