GWTTestCase meddling/not meddling

This tip comes from "Communicate with a Server"

"Although GWT translates Java into JavaScript for client-side code,
GWT does not meddle with your ability to run Java bytecode on your
server whatsoever. Server-side code doesn't need to be translatable,
so you're free to use any Java library you find useful."

Simply put, I want GWT to meddle with some of my code, but not all of
it.

Is there a way to have a unit test with both server and client code?
This code fails with an error message.
--------------------------------------------------------------------------------------------
import com.example.myproject.server.GreetingServiceImpl;

public class ProjectTest extends GWTTestCase {

public String getModuleName() {
return "com.example.myproject.Project";
}
GreetingServiceImpl greet = new GreetingServiceImpl();

@Test
public void test01(){
}

}
--------------------------------------------------------------------------------------------
No source code is available for type
com.example.myproject.server.GreetingServiceImpl; did you forget to
inherit a required module?
--------------------------------------------------------------------------------------------

I understand why this fails. How can we get this to work?

Thanks,
Tim

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