package stdlib;

import static org.junit.Assert.*;
import org.junit.Test;

public class SubscriptionsTEST {
  public static class Counter {
    private Subscriptions<Counter,String> oh = new Subscriptions<Counter,String>(this);
    public void addSubscriber(Subscriber<Counter,String> subscriber) {
      oh.addSubscriber(subscriber);
    }
    public void notifySubscribers(String data) {
      oh.notifySubscribers(data);
    }

    int j;
    public int get() {
      return j;
    }
    public void inc() {
      j++;
      oh.setChanged();
    }
    public String toString() {
      return "Counter(" + j + ")";
    }
  }

  @Test
  public void testA () {
    Counter c = new Counter();
    c.addSubscriber((sender, data) -> System.out.println ("update(" + sender + "," + data + ")"));
    c.inc();
    c.inc();
    c.notifySubscribers("Dog");
  }
  private String output;
  @Test
  public void testB () {
    Counter c = new Counter();
    c.addSubscriber((sender, data) -> output = ("update(" + sender + "," + data + ")"));
    c.inc();
    c.inc();
    c.notifySubscribers("Dog");
    assertEquals("update(Counter(2),Dog)",output);
  }
}