Add missing transaction integration test
user
```ruby
# encoding: utf-8
require 'integration_test_helper'

class TransactionCreateEditTest < JavascriptIntegrationTest
  setup do
    @artefact = FactoryGirl.create(:artefact,
      slug: "register-for-space-flight",
      kind: "transaction",
      name: "Register for space flight",
      owning_app: "publisher",
    )

    setup_users
    stub_collections
  end

  with_and_without_javascript do
    should "edit a new TransactionEdition" do
      visit "/publications/#{@artefact.id}"

      assert page.has_content? @artefact.name

      fill_in "Introductory paragraph", :with => "Become a space pilot"
      fill_in "Will continue on", :with => "UK Space Recruitment"
      fill_in "More information", :with => "Take part in the final frontier"

      save_edition_and_assert_success
      assert page.has_content? @artefact.name

      transaction = TransactionEdition.first
      assert_equal @artefact.id.to_s, transaction.panopticon_id

      assert_equal "Become a space pilot", transaction.introduction
      assert_equal "UK Space Recruitment", transaction.will_continue_on
      assert_equal "Take part in the final frontier", transaction.more_information
    end

    should "allow editing a TransactionEdition" do
      transaction = FactoryGirl.create(:transaction_edition,
                                   :panopticon_id => @artefact.id,
                                   :title => "Register for space flight",
                                   :introduction => "Become a space pilot",
                                   :will_continue_on => "UK Space Recruitment",)

      visit "/editions/#{transaction.to_param}"

      assert page.has_content? 'Register for space flight'
      assert page.has_field?("Introductory paragraph", :with => "Become a space pilot")
      assert page.has_field?("Will continue on", :with => "UK Space Recruitment")

      fill_in "Introductory paragraph", :with => "Get your licence to fly to Mars"
      fill_in "Will continue on", :with => "UK Terrestrial Mars Office"

      save_edition_and_assert_success

      t = TransactionEdition.find(transaction.id)
      assert_equal "Get your licence to fly to Mars", t.introduction
      assert_equal "UK Terrestrial Mars Office", t.will_continue_on
    end
  end

  should "disable fields for a published edition" do
    edition = FactoryGirl.create(:transaction_edition,
                                  :panopticon_id => @artefact.id,
                                  :state => 'published',
                                  :slug => @artefact.slug,
                                  :title => "Foo transaction"
                                )

    visit "/editions/#{edition.to_param}"
    assert_all_edition_fields_disabled(page)
  end
end
```
assistant