Cannot get basic emberjs application to work on rails platform

I have a rails app that contains a StaticController with an index action:

class Private::StaticController < PrivateController

  def index

  end
end

routes.rb:

get 'static' => 'private/static#index'

I want to start an emberjs application in the corresponding view:

<%= javascript_include_tag 'ember_application' %>
<h1>Hello</h1>
<script type="text/x-handlebars">
  <div>{{outlet}}</div>
</script>

For that I created a basic emberJS router:

PlatformUI.Router.map(function() {
  this.route('test', { path: '/test' });
});

PlatformUI.Router.reopen({
  rootURL: '/static/'
});

The template (in app/assets/javascripts/templates/test.handlebars) contains:

<script type="text/x-handlebars" data-template-name="test">    
    <h2>Something</h2>
</script>

When running the application, just the word 'Hello' is displayed on the page. The ember inspector (chrome plugin) says that emberjs is correctly loaded. Is there a problem with the routes? How can I debug this??

Gemfile:

gem 'ember-rails'
gem 'ember-source', '~> 1.9.1'