add test for private method listener

src/test/java/com/collarmc/pounce/EventBusTest.java

@@ -9,6 +9,17 @@
 
 public class EventBusTest {
 
+    @Test
+    public void privateSubscriber() {
+        PrivateListener listener = new PrivateListener();
+        EventBus eventBus = new EventBus(Runnable::run);
+        eventBus.subscribe(listener);
+        Event e = new Event();
+        // Fire it
+        eventBus.dispatch(e);
+        Assert.assertEquals(e, listener.event);
+    }
+
     @Test
     public void unsubscribe() {
         // Subscribe to the event
@@ -205,4 +216,12 @@ public void exec3(Event event) {
             this.event3 = event;
         }
     }
+
+    public static class PrivateListener  {
+        Event event;
+        @Subscribe(Preference.CALLER)
+        private void exec(Event event) {
+            this.event = event;
+        }
+    }
 }