Ember.js meet Capybara

application.html.erb

  <!-- ... -->
  <%= javascript_include_tag 'test' if Rails.env.test? %>
  <!-- ... -->

request_helper.rb

module RequestHelper
  def self.included(base)
    base.send(:include, InstanceMethods)
  end
  
  module InstanceMethods
    ##
    # Wait up to 3 seconds for asyncronous action processing to complete
    def wait_for_async
      start_time = Time.now
      loop do
        break if page.evaluate_script('Object.keys(test.ajaxRequests).length == 0 && !Ember.run.hasScheduledTimers() && !Ember.run.currentRunLoop')
        raise "Waited too long for ajax requests to finish #{page.evaluate_script('JSON.stringify(test.ajaxRequests)')} - #{page.evaluate_script('!Ember.run.hasScheduledTimers()')} - #{page.evaluate_script('!Ember.run.currentRunLoop')}" if (Time.now - start_time) > 3
        sleep 0.1
      end
    end
  end
end

spec_helper.rb

# ...

RSpec.configure do |config|
  config.include RequestHelper, :type => :feature
end

# ...

test.js

test = {
  ajaxRequests: {}
};

$(document).on('ajaxSend', function(e, xhr, options) {
  test.ajaxRequests[options.url] = true;
}).on('ajaxComplete', function(e, xhr, options) {
  delete test.ajaxRequests[options.url];
});