Unit testing anonymous inner classes as event listener

Unit.java

public class Unit {

    public Unit(EventDispatcher dispatcher) {

        dispatcher.addHandler(MyEvent.class, new IEventHandler() {			
            public void onEvent(MyEvent event) {
	        // some behavior
            }			
        });
		
    }

}

UnitTest.java

public class UnitTest {

    @Test
    public void whenDispatcherTriggersMyEventThenIExpectBehaviour() {
        EventDispatcher mockedDispatcher = mock(EventDispatcher.class);
        new Unit(mockedDispatcher);

        ArgumentCaptor<IEventHandler> myEventHandlerCaptor = ArgumentCaptor.forClass(IEventHandler.class);
        verify(mockedDispatcher).addHandler(eq(MyEvent.class), myEventHandlerCaptor.capture());

        IEventHandler myEventHandler = myEventHandlerCaptor.getValue();		
        MyEvent mockedEvent = mock(MyEvent.class);

        myEventHandler.onEvent(mockedEvent);

        // verify behavior
    }

}

Its all about naming things ;-) #ServerObserver

@jmaicher
thanks man,this one helped me ..