Performing a Service is as simple as this:
GreetingService greetingService = new GreetingService();
GreetingArgument greetingArgument = new GreetingArgument();
greetingArgument.name = "Robert";
GreetingResult greetingResult = serviceHandler.
doService(null, greetingService, greetingArgument);
assertThat(greetingResult.getGreeting(),
containsString("Hello Robert. Nice to meet you!"));