[BUGFIX LTS] fix router test regression for all router service

properties

packages/@ember/-internals/routing/lib/services/router.ts

@@ -58,6 +58,7 @@ export default class RouterService extends Service {
     }
     const owner = getOwner(this) as Owner;
     router = owner.lookup('router:main') as EmberRouter;
+    router.setupRouter();
     return (this[ROUTER] = router);
   }
 
@@ -240,7 +241,6 @@ export default class RouterService extends Service {
      @public
    */
   urlFor(routeName: string, ...args: any[]) {
-    this._router.setupRouter();
     return this._router.generate(routeName, ...args);
   }
 
@@ -376,7 +376,6 @@ export default class RouterService extends Service {
       `You must pass a url that begins with the application's rootURL "${this.rootURL}"`,
       url.indexOf(this.rootURL) === 0
     );
-    this._router.setupRouter();
     let internalURL = cleanURL(url, this.rootURL);
     return this._router._routerMicrolib.recognize(internalURL);
   }
@@ -397,7 +396,6 @@ export default class RouterService extends Service {
       `You must pass a url that begins with the application's rootURL "${this.rootURL}"`,
       url.indexOf(this.rootURL) === 0
     );
-    this._router.setupRouter();
     let internalURL = cleanURL(url, this.rootURL);
     return this._router._routerMicrolib.recognizeAndLoad(internalURL);
   }
@@ -511,7 +509,9 @@ RouterService.reopen(Evented, {
      @type String
      @public
    */
-  currentRouteName: readOnly('_router.currentRouteName'),
+  get currentRouteName() {
+    return this._router.currentRouteName;
+  },
 
   /**
      Current URL for the application.