Ember testing with external url

I am making a webapp using Ember.js and I have a controller that redirects to an external URL using location.replace.

Using ember test, the test crash on window.replace and shows this error :

Not found: /2/tests/undefined?moneyintoken=35e66601-7159-45e5-b3b2-6f7af61b5e74&lang=es&p=localhost/assets/lemonway.css

Any idea?

Thanks in advance. David.