Add simple test

Sources/FirebladeECS/Event.swift

@@ -21,6 +21,10 @@ extension ECSEvent {
 
 extension EventHandler {
 
+	unowned var listenerRef: EventHandler {
+		return self
+	}
+
 	/// Subscribe with an event handler closure to receive events of type T
 	///
 	/// - Parameter eventHandler: event handler closure

Tests/FirebladeECSTests/Components.swift

@@ -0,0 +1,10 @@
+//
+//  Components.swift
+//  FirebladeECSTests
+//
+//  Created by Christian Treffs on 09.10.17.
+//
+
+import FirebladeECS
+
+struct EmptyComponent: Component { }

Tests/FirebladeECSTests/FirebladeECSTests.swift

@@ -3,10 +3,42 @@ import XCTest
 
 class FirebladeECSTests: XCTestCase {
 
+	class MyEventHandler: EventHandler {
+		init() {
+			subscribe(event: handleEntityCreated)
+			subscribe(event: handleEntityDestroyed)
+			subscribe(event: handleComponentAdded)
+		}
+		deinit {
+			unsubscribe(event: handleEntityCreated)
+			unsubscribe(event: handleComponentAdded)
+			unsubscribe(event: handleEntityDestroyed)
+		}
+
+		func handleEntityCreated(ec: EntityCreated) {
+			Log.warn(ec)
+		}
+
+		func handleEntityDestroyed(ed: EntityDestroyed) {
+			Log.warn(ed)
+		}
+
+		func handleComponentAdded(ca: ComponentAdded) {
+			Log.debug(ca)
+		}
+
+	}
+
+	let eventHandler: MyEventHandler = MyEventHandler()
 
 	func testCreateEntity() {
 		let newEntity = Entity()
+
 		XCTAssert(newEntity.hasComponents == false)
 		XCTAssert(newEntity.uei == 1)
+		XCTAssert(newEntity.numComponents == 0)
+
+		let pC: EmptyComponent? = newEntity.peekComponent()
+		XCTAssert(pC == nil)
 	}
 }