Hi,
As far as I know, an answer to your question depends on the binding type used by your WCF service.
1. If your service uses either the basicHttpBinding or wsHttpBinding binding to communicate with client applications, you can change your tests so that they worked with the web service via TestComplete's special objects, their methods and properties.
2. If your service doesn't use any of the mentioned bindings, you should keep using the approach you described.
For more information on testing WCF services with TestComplete, please refer to the WCF Services - Specifics of Testing help topic.
I hope this information helps :)
