@Before
    public void setUp() {
        client = new GaeUserServiceClient();
        client.setCallbackUrl(CALLBACK_URL);
        context = MockWebContext.create();
        helper.setUp();
    }
Tests the {@link GaeUserServiceClient}.

@author Jerome Leleu
@since 1.9.0
pac4j-gae/src/test/java/org/pac4j/gae/client/GaeUserServiceClientTests.java