FakeProvider for EventBinder (http://klimer.eu/2014/08/27/testing-gwteventbinder-with-gwtmockito/)

FakeEventBinderProvider.java

public class FakeEventBinderProvider implements FakeProvider<EventBinder<?>> {
    @Override
    public EventBinder<?> getFake(Class<?> type) {
        return (EventBinder<?>) Proxy.newProxyInstance(FakeEventBinderProvider.class.getClassLoader(), new Class<?>[] { type }, new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, final Object[] args) throws Throwable {
                String methodName = method.getName();
                assert methodName.equals("bindEventHandlers");

                final List<HandlerRegistration> registrations = new LinkedList<HandlerRegistration>();
                EventBus eventBus = (EventBus) args[1];

                List<Method> presenterMethods = getAllMethods(args[0].getClass());
                for (final Method presenterMethod : presenterMethods) {
                    if (presenterMethod.isAnnotationPresent(EventHandler.class)) {
                        @SuppressWarnings("unchecked") // Should always be ok, since the Generator for EventBinder should do all the safe-checking 
                        Class<? extends GenericEvent> eventType = (Class<? extends GenericEvent>) (presenterMethod.getParameterTypes())[0];
                        registrations.add(eventBus.addHandler(GenericEventType.getTypeOf(eventType), new GenericEventHandler() {
                            @Override
                            public void handleEvent(GenericEvent event) {
                                try {
                                    presenterMethod.setAccessible(true);
                                    presenterMethod.invoke(args[0], event);
                                } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
                                    throw new RuntimeException(e);
                                }
                            }
                        }));
                    }
                }

                return new HandlerRegistration() {
                    @Override
                    public void removeHandler() {
                        for (HandlerRegistration registration : registrations) {
                            registration.removeHandler();
                        }
                        registrations.clear();
                    }
                };
            }
        });
    }

    private List<Method> getAllMethods(Class<?> type) {
        List<Method> methods = new LinkedList<Method>();
        methods.addAll(Arrays.asList(type.getDeclaredMethods()));
        if (type.getSuperclass() != null) {
            methods.addAll(getAllMethods(type.getSuperclass()));
        }
        return methods;
    }
}

Test.java

@Before
public void setUpEventBindery() {
    GwtMockito.useProviderForType(EventBinder.class, new FakeEventBinderProvider());
}

Thanks a lot for writing this - it was super useful in helping get integration testing working in a GWT app via Guice.

Since gwteventbinder has been updated to support handling multiple event types in a single handler, I've hacked up support for calling methods based on the event types in their EventHandler annotation. :)