within helper for ember-test

gistfile1.js

Ember.Test.registerHelper('within', function(app, withinContext, callback){
  var originalFind = window.find;
  window.find = function(selector, context) {
    return originalFind.call(app, selector, withinContext);
  };
  callback.call();
  window.find = originalFind;
});

visit('/')
  .then(function() {
    within('nav.top-bar', function() {
      equal(find('a:contains(Home)').attr('href'), '/', 'Home link in top navbar');
      equal(find('a:contains(About)').attr('href'), '/about', 'About link in top navbar');
    });
    
    within('nav.footer', function() {
      equal(find('a:contains(Home)').attr('href'), '/', 'Home link in footer');
      equal(find('a:contains(About)').attr('href'), '/about', 'About link in footer');
    });
   });