Helpers for testing Ember applications using Cucumber and Watir

ember-cucumber.rb

# coding: UTF-8

module PatientlyHelper
  def patiently(seconds=5, &block)
    start_time = Time.now
    begin
      block.call
    rescue Exception => e
      raise e if (Time.now - start_time) >= seconds
      sleep(0.05)
      retry
    end
  end
end
World PatientlyHelper

# Thanks to http://trianglegrrl.github.io/ember-cucumber-pres/#/
# for the examples

module EmberHelpers
  def add_ajax_listeners
    @browser.execute_script %Q{
      // Monitor pending AJAX requests for testing.
      // ajaxStart is triggered on new requests when none are pending.
      $(document).ajaxStart(function() {
        $('body').addClass('ajax-pending').removeClass('ajax-quiet');
      });
      // ajaxStop is triggered when all pending requests are done.
      $(document).ajaxStop(function() {
        $('body').addClass('ajax-quiet').removeClass('ajax-pending');
      });
    }
  end
  def expect_dependencies
    throw 'No jQuery' if @browser.execute_script "return !$"
    throw 'No Ember' if @browser.execute_script "return !Ember"
  end
  def detect_ember_app
    return @browser.execute_script "return $('body').hasClass('ember-application')"
  end
  def wait_for_ember_application_to_load
    patiently do
      expect_dependencies
      throw 'No Ember application' unless detect_ember_app
    end
  end
  def wait_for_ember_run_loop_to_complete
    return unless detect_ember_app
    patiently do
      expect_dependencies
      throw 'AJAX pending' if @browser.execute_script "return $('body').hasClass('ajax-pending')"
      throw 'No pause in Ember run loop' unless @browser.execute_script "return !Ember.run.currentRunLoop"
    end
  end
end
World EmberHelpers

# Annotate scenarios with this
AfterStep('@patiently-for-ember') do
  wait_for_ember_run_loop_to_complete
end

# Assert this after loading an Ember app
Then(/^I should be in an Ember app$/) do
  wait_for_ember_application_to_load
  add_ajax_listeners
end