Saving and loading fixtures for jasmine test

#####################################
jasmine_fixtures_test_helper.rb - Include in lib/
#####################################

class ActionController::TestCase
  def self.save_fixture(fixtures, &expectations)

    fixtures.each do |(fixture_name, selector)|

      should "save the content of the selector #{selector} to fixture file #{fixture_name}.html" do
        selected_section_in_document = Nokogiri::HTML(@response.body).css(selector)
        instance_exec(selected_section_in_document, &expectations) if block_given?

        fixture_content = selected_section_in_document.to_html

        fixture_file = File.expand_path(RAILS_ROOT + "/tmp/js_dom_fixtures/#{fixture_name}.html")
        FileUtils.mkdir_p File.dirname(fixture_file)
        File.open(fixture_file, "w") { |file| file.puts fixture_content }
        Rails.logger.info "Saving jasmine fixture #{fixture_file} (#{fixture_content.size} bytes)"
      end

    end
  end
end

#####################################
In functional tests to save a fixture
#####################################

save_fixture "fixture-name-goes-here" => "#selector_for_fixture_root_node" do |content|
  # make assertions on what should be in the fixture
  assert content.css("form").any?
end

#####################################
SpecHelper.js
#####################################

$(function() {
  $.realAjax = $.ajax;
});

beforeEach(function() {

  $.realAjax = $.ajax;
  spyOn($, "ajax");
  spyOn(window, "confirm");
  spyOn(window, "alert");

  $.fn.jqmShow = $.noop;
  $.fn.jqmHide = $.noop;
  $.fn.datepicker = $.noop;
  $.fn.placeholder = $.noop;
  $.fn.ajaxForm = $.noop;

  this.addMatchers({
    hasElements: function() {
      if(this.actual instanceof jQuery) {
        return this.actual.length > 0;
      } else {
        throw "ELEMENT IS NOT A JQUERY OBJECT";
      }
    },
    is: function(selector) {
      if(this.actual instanceof jQuery) {
        return this.actual.is(selector);
      } else {
        throw "ELEMENT IS NOT A JQUERY OBJECT";
      }
    },
    hasClass: function(className) {
      if(this.actual instanceof jQuery) {
        return this.actual.hasClass(className);
      } else {
        throw "ELEMENT IS NOT A JQUERY OBJECT";
      }
    }
  });
});

afterEach(function() {
  specDOM().html('');
});

var FIXTURE_CACHE = {};

function loadFixture(fixtureName) {
  var fixtureContent = getFixtureHtml(fixtureName);
  $("#jasmine_content").html(fixtureContent).find("input[type=file]").each(function() {
    $(this).replaceWith($(this).clone().attr("type", "text"));
  });
}

function getFixtureHtml(fixtureName) {
  var fixtureContent;
  if (fixtureName in FIXTURE_CACHE) {
    fixtureContent = FIXTURE_CACHE[fixtureName];
  } else {
    var fixtureUrl = "/__root__/tmp/js_dom_fixtures/" + fixtureName + ".html";
    fixtureContent = FIXTURE_CACHE[fixtureName] = $.realAjax({cache: false, async: false, url: fixtureUrl}).responseText;
  }
  if (fixtureContent.indexOf('File not found')!=-1) {
    throw ("FixtureNotFoundError: " + fixtureContent);
  }
  return fixtureContent;
}

function specDOM(selector) {
  if(selector) {
    return $(selector, "#jasmine_content");
  } else {
    return $("#jasmine_content");
  }
}