#113 Event Driven Architecture

Adds unit test to assert and verify pattern behaviour

event-driven-architecture/src/test/java/EventDrivenTest.java

@@ -0,0 +1,47 @@
+import com.iluwatar.eda.EventDispatcher;
+import com.iluwatar.eda.event.UserCreatedEvent;
+import com.iluwatar.eda.event.UserUpdatedEvent;
+import com.iluwatar.eda.handler.UserCreatedEventHandler;
+import com.iluwatar.eda.handler.UserUpdatedEventHandler;
+import com.iluwatar.eda.model.User;
+
+import org.junit.Test;
+
+
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+import static org.junit.Assert.assertEquals;
+
+public class EventDrivenTest {
+
+  @Test
+  public void testEventDriverPattern(){
+
+    EventDispatcher dispatcher = spy(new EventDispatcher());
+    UserCreatedEventHandler userCreatedEventHandler =  new UserCreatedEventHandler();
+    UserUpdatedEventHandler userUpdatedEventHandler = new UserUpdatedEventHandler();
+    dispatcher.registerChannel(UserCreatedEvent.class, userCreatedEventHandler);
+    dispatcher.registerChannel(UserUpdatedEvent.class, userUpdatedEventHandler);
+
+    assertEquals("Two handlers must be registered", 2, dispatcher.getHandlers().size());
+    assertEquals("UserCreatedEvent must return the UserCreatedEventHandler",
+            userCreatedEventHandler,
+            (UserCreatedEventHandler)dispatcher.getHandlers().get(UserCreatedEvent.class));
+    assertEquals("UserUpdatedEvent must be registered to the UserUpdatedEventHandler",
+            userUpdatedEventHandler,
+            (UserUpdatedEventHandler)dispatcher.getHandlers().get(UserUpdatedEvent.class));
+
+    User user = new User("iluwatar");
+
+    UserCreatedEvent userCreatedEvent = new UserCreatedEvent(user);
+    UserUpdatedEvent userUpdatedEvent = new UserUpdatedEvent(user);
+    dispatcher.dispatch(userCreatedEvent);
+    dispatcher.dispatch(userUpdatedEvent);
+
+    //verify that the events have been dispatched
+    verify(dispatcher).dispatch(userCreatedEvent);
+    verify(dispatcher).dispatch(userUpdatedEvent);
+
+  }
+}