ContainerView - Assertion failed: calling set on destroyed object - in tests using ember-mocha-adapter

sidebar.js

var Ember = require('ember'),
  Constants = require('../constants'),
  MapOverlayView = require('./map/overlay'),
  SearchView = require('./search'),
  NavigationView = require('./navigation'),
  SidebarView;

SidebarView = Ember.View.extend({
  templateName: 'sidebar',
  elementId: 'sidebar',
  classNameBindings: ['position', 'isVisible'],
  contentView: Ember.ContainerView.create(),
  mapOverlayView: MapOverlayView,
  searchView: SearchView,
  navigationView: NavigationView,
  position: 'right',
  isVisible: true,
  isPinned: false,
  settings: null,

  setupSettings: function () {
    var settings = Constants.map.sidebar;

    this.set('position', settings.position);
    this.set('isVisible', settings.visible);
    this.set('isPinned', settings.pinned);
    this.set('settings', settings);
  }.on('init'),

  actions: {
    setCurrentView: function (viewPropertyName) {
      var container = this.get('contentView'),
        view = this.get(viewPropertyName),
        currentView;

      if (container && view) {
        currentView = container.get('currentView');

        if (currentView && currentView.constructor === view) {
          container.set('currentView', undefined);
        }
        else {
          container.set('currentView', view.create());
        }
      }
    }
  }
});

module.exports = SidebarView;

stacktrace.js

// From devtools

Assertion failed: calling set on destroyed object libs.js:23878
logToConsole libs.js:23878
Ember.assert libs.js:20666
set libs.js:23386
(anonymous function) libs.js:24225
Ember.tryFinally libs.js:22005
Ember.changeProperties libs.js:23306
Ember.setProperties libs.js:24223
Ember.View.Ember.CoreView.extend.createChildView libs.js:44321
Ember.merge.appendChild libs.js:44821
Ember.View.Ember.CoreView.extend.appendChild libs.js:44171
EmberHandlebars.ViewHelper.Ember.Object.create.helper libs.js:48987
viewHelper libs.js:49165
anonymous .templates.js:976
__exports__.template libs.js:61619
Ember.View.Ember.CoreView.extend.render libs.js:43409
Ember.CoreView.Ember.Object.extend._renderToBuffer libs.js:42347
Ember.View.Ember.CoreView.extend._renderToBuffer libs.js:43976
superWrapper libs.js:21823
instrumentRenderToBuffer libs.js:42328
Ember.Instrumentation.instrument libs.js:22274
Ember.CoreView.Ember.Object.extend.renderToBuffer libs.js:42327
Ember.merge.appendChild libs.js:44825
Ember.View.Ember.CoreView.extend.appendChild libs.js:44171
EmberHandlebars.ViewHelper.Ember.Object.create.helper libs.js:48987
viewHelper libs.js:49165
renderHelper libs.js:57083
anonymous .templates.js:8
__exports__.template libs.js:61619
Ember.View.Ember.CoreView.extend.render libs.js:43409
Ember.CoreView.Ember.Object.extend._renderToBuffer libs.js:42347
Ember.View.Ember.CoreView.extend._renderToBuffer libs.js:43976
superWrapper libs.js:21823
instrumentRenderToBuffer libs.js:42328
Ember.Instrumentation.instrument libs.js:22274
Ember.CoreView.Ember.Object.extend.renderToBuffer libs.js:42327
Ember.View.Ember.CoreView.extend.createElement libs.js:43807
Ember.merge.insertElement libs.js:44752
Ember.View.Ember.CoreView.extend._insertElement libs.js:43735
DeferredActionQueues.flush libs.js:26243
Backburner.end libs.js:26334
Backburner.run libs.js:26373
Ember.run libs.js:26774
visit libs.js:60850
(anonymous function) libs.js:60426
isolate libs.js:60623
(anonymous function) libs.js:60606
invokeCallback libs.js:30020
publish libs.js:29690
publishFulfillment libs.js:30110
DeferredActionQueues.flush libs.js:26243
Backburner.end libs.js:26334
Backburner.run libs.js:26373
Ember.run libs.js:26774
(anonymous function)

// Within the tests

Error: Assertion Failed: calling set on destroyed object
    at new Error (native)
    at Error.Ember.Error (libs.js:21429:19)
    at Object.Ember.assert (libs.js:20671:11)
    at set (libs.js:23386:9)
    at libs.js:24225:40
    at Ember.tryFinally (libs.js:22005:24)
    at Ember.changeProperties (libs.js:23306:3)
    at Object.Ember.setProperties (libs.js:24223:3)
    at Ember.View.Ember.CoreView.extend.createChildView (libs.js:44321:13)
    at Object.Ember.merge.appendChild (libs.js:44821:22)

template.hbs

<ul class="navigation">
  <li>
    <a class="accent-grey" {{action 'setCurrentView' 'navigationView' target=view}}>
      <i class="fa fa-bars icon-white"></i>
    </a>
  </li>

  <li>
    <a class="accent-blue" {{action 'setCurrentView' 'searchView' target=view}}>
      <i class="fa fa-search icon-white"></i>
    </a>
  </li>

  {{#if controllers.map.visible}}
    <li>
      <a class="accent-purple" {{action 'setCurrentView' 'mapOverlayView' target=view}}>
        <i class="fa fa-th-large icon-white"></i>
      </a>
    </li>

    <li>
      {{#link-to 'policymaker' class='accent-green'}}
        <i class="fa fa-legal icon-white"></i>
      {{/link-to}}
    </li>

    <li>
      <a {{action 'toggleFullscreen'}} class="accent-orange">
        <i class="fa fa-expand icon-white"></i>
      </a>
    </li>
  {{/if}}
</ul>

<div class="content">
  {{view view.contentView}}
</div>

test.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <title>Mocha Test - Connecticut Broadband</title>

    <link rel="stylesheet" href="../assets/bower_components/leaflet/dist/leaflet.css">
    <link rel="stylesheet" href="../assets/styles/libs.css">
    <link rel="stylesheet" href="../assets/styles/styles.css">
    <link rel="stylesheet" media="all" href="assets/bower_components/mocha/mocha.css">
    <script src="../assets/scripts/libs.js"></script>
    <style>
      #ember-container {
        position: fixed;
        bottom: 1em;
        right: 1em;
        width: 50%;
        height: 85%;
        border: 1px solid #333;
      }

      #mocha {
        width: 50%;
        padding: 1em;
        margin: 30px 0 0 0;
        color: #444;
      }
    </style>
  </head>
  <body>
    <div id="mocha"></div>
    <div id="ember-container"></div>

    <script src="../assets/scripts/application.js"></script>
    <script src="assets/bower_components/ember-mocha-adapter/adapter.js"></script>
    <script type="application/javascript">
      window.jQuery = Ember.$;
    </script>
    <script src="assets/bower_components/chai/chai.js"></script>
    <script src="assets/bower_components/chai-jquery/chai-jquery.js"></script>
    <script src="assets/bower_components/sinon-chai/lib/sinon-chai.js"></script>
    <script src="assets/bower_components/sinonjs/sinon.js"></script>
    <script src="assets/bower_components/mocha/mocha.js"></script>
    
    <script type="application/javascript">
      Ember.Test.adapter = Ember.Test.MochaAdapter.create();
      App.rootElement = '#ember-container';
      App.setupForTesting();
      App.injectTestHelpers();

      mocha.setup('bdd');
    </script>

    <!-- Include tests here -->
    <script src="test.js"></script>


    <script type="application/javascript">
      mocha.run();
    </script>
  </body>
</html>

tests-run-before-route-load.js

describe('Location Panel', function () {
  beforeEach(function () {
    App.reset();
    visit('/map/41.76721,-72.66907');
  });

  it('Have proper address', function () {
    andThen(function () {
      var $title = find('.panel-header h2');
      expect($title).to.have.text('476 Columbus Blvd, Hartford');
    });
  });

  it('Have average download speed', function () {
    andThen(function () {
      var $dspeed = find('.average-dspeed');

      expect($dspeed).to.have.text('4.5 Mbps');
    });
  });

  it('Have average upload speed', function () {
    andThen(function () {
      var $uspeed = find('.average-uspeed');

      expect($uspeed).to.not.have.text('-');
    });
  });
});

do you solve your problem? i am also using mocha adapter, get below error and don't know how to solve it
ok 9 PhantomJS 1.9 - Viewing an initiative Successfully
not ok 10 PhantomJS 1.9 - Viewing an initiative "after each" hook
---
message: >
Assertion Failed: calling set on destroyed object
stack: >
Error: Assertion Failed: calling set on destroyed object
at http://localhost:7357/assets/vendor.js:13269
at set (http://localhost:7357/assets/vendor.js:19612)
at http://localhost:7357/assets/vendor.js:65383
at http://localhost:7357/assets/vendor.js:67226
at tryable (http://localhost:7357/assets/vendor.js:16404)
at http://localhost:7357/assets/vendor.js:20923

Also having this issue.