How can I test the creation of static files in an addon?

I have an ember addon that creates static files in your app's dist directory. Ember's visit helper checks the routes but not if a static file exists, and I can't use fs since it's a browser test. Is there a method of doing this? Or does Ember have an existing method of doing server tests?

Here is the specific commit I'm trying to test. http://ift.tt/1C6LKEX