Add simple unit test and fix event handler ordering

src/test/java/dev/kske/eventbus/EventBusTest.java

@@ -0,0 +1,39 @@
+package dev.kske.eventbus;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.*;
+
+/**
+ * Tests the of the event bus library.
+ *
+ * @author Kai S. K. Engelbart
+ * @since 0.0.1
+ */
+class EventBusTest implements EventListener {
+
+	public EventBus eventBus = new EventBus();
+	int hits;
+
+	@BeforeEach
+	public void registerListener() {
+		eventBus.registerListener(this);
+	}
+
+	@Test
+	void testDispatch() {
+		eventBus.dispatch(new SimpleEvent());
+	}
+
+	@Event(priority = 50)
+	public void onSimpleEventSecond(SimpleEvent event) {
+		++hits;
+		assertEquals(2, hits);
+	}
+
+	@Event(priority = 150)
+	public void onSimpleEventFirst(SimpleEvent event) {
+		++hits;
+		assertEquals(1, hits);
+	}
+}

src/test/java/dev/kske/eventbus/SimpleEvent.java

@@ -0,0 +1,9 @@
+package dev.kske.eventbus;
+
+/**
+ * A simple event for testing purposes.
+ *
+ * @author Kai S. K. Engelbart
+ * @since 0.0.1
+ */
+public class SimpleEvent implements IEvent {}