Jagepard / JavaDesignPatterns-Mediator

class MediatorTest {

    private HandlerInterface handler;

    private MediatorInterface mediator;

    @BeforeEach

    void setUp() {

        this.handler  = new Handler();

        this.mediator = new Mediator();

    }

    @Test

    void testNotify() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {

        AbstractListener listener1 = new Colleague1();

        AbstractListener listener2 = new Colleague2();

        AbstractListener listener3 = new Colleague3();

        this.mediator.addListener(listener1, "onEvent");

        this.mediator.addListener(listener2, "onEvent");

        this.mediator.addListener(listener3, "onEvent");

        ArrayList<String> result1 = handShake(handler, mediator, listener1, listener2);

        ArrayList<String> result2 = handShake(handler, mediator, listener2, listener3);

        ArrayList<String> result3 = handShake(handler, mediator, listener3, listener1);

        assertEquals("Behavioral.Mediator.Colleague1: How are you Behavioral.Mediator.Colleague2?", result1.get(0));

        assertEquals("Behavioral.Mediator.Colleague2: Fine, thanks!", result1.get(1));

        assertEquals("Behavioral.Mediator.Colleague2: How are you Behavioral.Mediator.Colleague3?", result2.get(0));

        assertEquals("Behavioral.Mediator.Colleague3: Fine, thanks!", result2.get(1));

        assertEquals("Behavioral.Mediator.Colleague3: How are you Behavioral.Mediator.Colleague1?", result3.get(0));

        assertEquals("Behavioral.Mediator.Colleague1: Fine, thanks!", result3.get(1));

    }

    private static ArrayList<String> handShake(HandlerInterface handler, MediatorInterface mediator, AbstractListener listener1, AbstractListener listener2) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {

        return listener1.toGreet(listener2.getClass().getName(), mediator, handler);

    }

}