[appengine-java] ApiProxyLocalImpl.getService question [junit]

[Pion]

I have the following server side code:

        package com.foo.server;
        // code deleted for brevity
        /**
         * The server side implementation of the RPC service.
         */
        @SuppressWarnings("serial")
        public class FooServiceImpl extends RemoteServiceServlet implements
FooService {
        // code deleted for brevity
                @Override
                public String barTest() {
                        return "unitTest";
                }
        } // FooServiceImpl

I copied/implemented the TestEnvironment and LocalServiceTestCase
classes as shown on 
http://code.google.com/appengine/docs/java/howto/unittesting.html.

Then, I implemented the following:
        public class ServerTest extends LocalServiceTestCase {

        ApiProxyLocalImpl proxy = (ApiProxyLocalImpl)
ApiProxy.getDelegate();
        FooServiceImpl server =  (FooServiceImpl ) proxy.getService
("com.foo.server");

        String result = barTest();                      // produces
java.lang.NullPointerException
        assertEquals("unitTest", result);

        } // ServerTest

I got the java.lang.NullPointerException on this line "String result =
barTest();"

My environments: GAE 1.25, GWT 1.7, Eclipse-Galileo on Windows Vista.

I am new on this. What did I do wrong?

Thanks in advance for your help.
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