1 files changed, 51 insertions, 0 deletions
diff --git a/src/csharp/GrpcCoreTests/Utils.cs b/src/csharp/GrpcCoreTests/Utils.cs
new file mode 100644
index 0000000000..b0c0a7b620
--- /dev/null
+++ b/src/csharp/GrpcCoreTests/Utils.cs
@@ -0,0 +1,51 @@
+using System;
+using System.Net;
+using System.Net.Sockets;
+
+namespace Google.GRPC.Core.Tests
+{
+    /// <summary>
+    /// Testing utils.
+    /// </summary>
+    public class Utils
+    {
+        static Random random = new Random();
+        // TODO: cleanup this code a bit
+        public static int PickUnusedPort()
+        {
+            int port;
+            do
+            {
+                port = random.Next(2000, 50000);
+
+            } while(!IsPortAvailable(port));
+            return port;
+        }
+        // TODO: cleanup this code a bit
+        public static bool IsPortAvailable(int port)
+        {
+            bool available = true;
+
+            TcpListener server = null;
+            try
+            {
+                IPAddress ipAddress = Dns.GetHostEntry("localhost").AddressList[0];
+                server = new TcpListener(ipAddress, port);
+                server.Start();
+            }
+            catch (Exception ex)
+            {
+                available = false;
+            }
+            finally
+            {
+                if (server != null)
+                {
+                    server.Stop();
+                }
+            }
+            return available;
+        }
+    }
+}
+