Use Service decorator in appropriate test file

Author: Julien Heller

test/decorators/Service.spec.ts

@@ -187,8 +187,13 @@ describe("Service Decorator", function() {
     it("should support services with asynchronous initialization", async function() {
 
         @Service({ asyncInitialization: true })
-        class Engine extends AsyncInitializedService {
+        class Engine {
             ignition: string = "off";
+            initialized: Promise<any>;
+
+            constructor() {
+                this.initialized = this.initialize();
+            }
 
             protected initialize() {
                 return new Promise((resolve) => {