Updated test for the inject function

Updated the test for the inject function to assign it to a variable typed to ng.IPromise<any> to test/verify that method's return type.

oclazyload/oclazyload-tests.ts

@@ -89,7 +89,7 @@ angular.module('app').controller(['$ocLazyLoadProvider', function ($ocLazyLoad:
         'testModule2.js'
     ]);
 
-    $ocLazyLoad.inject('testModule');
+    var promise: ng.IPromise<any> = $ocLazyLoad.inject('testModule');
 
     $ocLazyLoad.toggleWatch(true);
-}]);
+}]);