added tests for sharp7 client

Sharp7.Tests/ServerClientTestBase.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Linq;
+using Shouldly;
+
+namespace Sharp7.Tests
+{
+    public class ServerClientTestBase : ServerTestBase, IDisposable
+    {
+        private S7Client client;
+        public S7Client Client => client;
+
+        public ServerClientTestBase() : base()
+        {
+            client = new S7Client();
+            var rc = client.ConnectTo(Localhost, 0, 2);
+            rc.ShouldBe(0);
+        }
+
+
+        public new void Dispose()
+        {
+            client.Disconnect();
+            base.Dispose();
+        }
+    }
+}