@Before
 public void before() {
   _exchange = Mockito.mock(ExchangeImpl.class, Mockito.RETURNS_DEEP_STUBS);
   _message = new DefaultMessage();
   Mockito.when(_exchange.createMessage()).thenReturn(_message);
   _composer = new SOAPMessageComposer();
   _composer.setContextMapper(
       new SOAPContextMapper() {
         public void mapFrom(SOAPBindingData sbd, Context context) {
           return;
         }
       });
 }