diff --git a/utils/server_test.go b/utils/server_test.go
new file mode 100644
index 000000000..a022b2cb0
--- /dev/null
+++ b/utils/server_test.go
@@ -0,0 +1,57 @@
+/*
+Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
+Copyright (C) ITsysCOM GmbH
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+package utils
+
+import (
+	"net"
+	"net/rpc"
+	"net/rpc/jsonrpc"
+	"testing"
+)
+
+func TestServerTestMock(t *testing.T) {
+	ln, err := net.Listen("tcp", ":0") // will pick a free port number automatically
+	if err != nil {
+		t.Fatal(err)
+	}
+	go func() {
+		for range 2 {
+			conn, err := ln.Accept()
+			if err != nil {
+				t.Error(err)
+			}
+			rpc.ServeCodec(jsonrpc.NewServerCodec(conn))
+		}
+	}()
+	client, err := jsonrpc.Dial("tcp", ln.Addr().String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer client.Close()
+	wantErr := "rpc: can't find service _goRPC_.Cancel"
+	serviceMethod := "_goRPC_.Cancel"
+	var reply bool
+	if err = client.Call(serviceMethod, nil, &reply); err == nil || err.Error() != wantErr {
+		t.Errorf("client.Call(%q) err = %v, want %v", serviceMethod, err, wantErr)
+	}
+	NewServer()
+	if err = client.Call(serviceMethod, nil, &reply); err != nil {
+		t.Fatalf("client.Call(%q) returned unexpected error: %v", serviceMethod, err)
+	}
+}