ember.js - ember-cli test: Teardown failed: Cannot read property 'unchain' of undefined -

i'm trying write simple test ember-cli app:

import startapp 'wallet2/tests/helpers/start-app';  var app;  module('integration - login', {   setup: function() {     app = startapp()   },   teardown: function() {     ember.run(app, "destroy");   } });  test('should ask me log in', function() {   visit('/').then(function() {     equal(find('h1#title').text(), 'please login');     equal(find('form').length, 1);   }); }); 

the tests pass teardown fails with:

teardown failed on should ask me log in: cannot read property 'unchain' of undefined source:          @ chainnodeprototype.unchain (http://localhost:4200/assets/vendor.js:17359:9)     @ chainnodeprototype.remove (http://localhost:4200/assets/vendor.js:17331:8)     @ ember.unwatchpath (http://localhost:4200/assets/vendor.js:17550:23)     @ object.ember.unwatch (http://localhost:4200/assets/vendor.js:17619:5)     @ object.ember.removeobserver (http://localhost:4200/assets/vendor.js:19031:9)     @ null.<anonymous> (http://localhost:4200/assets/vendor.js:37793:13)     @ object.sendevent (http://localhost:4200/assets/vendor.js:15748:14)     @ ember.evented.ember.mixin.create.trigger (http://localhost:4200/assets/vendor.js:31468:11)     @ superfunction [as _super] (http://localhost:4200/assets/vendor.js:20874:16)     @ ember.coreview.ember.object.extend.trigger (http://localhost:4200/assets/vendor.js:35658:17) 

i cannot find cause problem in backtrace.

here's start-app.js

var application = require('wallet2/app')['default']; var router = require('wallet2/router')['default'];  export default function startapp(attrs) {   var app;    var attributes = ember.merge({     // useful test defaults     rootelement: '#ember-testing',     log_active_generation:false,     log_view_lookups: false   }, attrs); // can override;    router.reopen({     location: 'none'   });    ember.run(function(){     app = application.create(attributes);     app.setupfortesting();     app.injecttesthelpers();   });    app.reset(); // shouldn't needed, want able "start app @ specific url"    return app; } 

any appreciated…

update (2014-07-07)

here's routes/index.js called when visiting "/" ('m using ember-simple-auth)

import ember 'ember'; import authenticatedroutemixin 'simple-auth/mixins/authenticated-route-mixin'; export default ember.route.extend( authenticatedroutemixin, {   redirect: function (params) {     this.transitionto("users.show", this.get('session.user'));   } }); 

the controllers/login.js

import ember 'ember'; import logincontrollermixin 'simple-auth/mixins/login-controller-mixin';  export default ember.controller.extend( logincontrollermixin, {   authenticator: 'simple-auth-authenticator:devise' }); 

and login.hbs template:

<div class="row">   <div class="col-xs-12 col-sm-6 col-sm-offset-3">     <h1 id="title">please login</h1>     <form {{action 'authenticate' on='submit'}} role="form">       <div class="form-group">         {{input id='identification' type="email" class="form-control" placeholder='email' value=identification}}       </div>       <div class="form-group">         {{input id='password' class="form-control" placeholder='password' type='password' value=password}}       </div>       <button class="btn btn-default" type="submit">login</button>     </form>   </div>   <div class="col-xs-12 col-sm-6 col-sm-offset-3">     <p class="top">       {{#link-to "users.reset_password"}}did forget password?{{/link-to}}     <p>   </div> </div> 

did try

ember.run(app, app.destroy); 

instead of

ember.run(app, "destroy"); 

?