Redmine

        container = obj.is_a?(Journal) ? obj.journalized : obj

        attachments = container.attachments if container.respond_to?(:attachments)

  def test_show_should_be_available_with_thumbnail_macro_of_another_journal_attachment_of_the_same_issue

    @request.session[:user_id] = 1

    issue = Issue.find(2)

    attachment = Attachment.generate!(filename: 'foo.png', digest: Redmine::Utils.random_hex(32))

    attachment.update(container: issue)

    issue.init_journal(User.first, "{{thumbnail(#{attachment.filename})}}")

    issue.save!

    issue.reload

    get :show, params: { id: issue.id }

    assert_select "div#history div#journal-#{issue.journals.last.id}-notes" do

      assert_select "a.thumbnail[title=?][href='/attachments/#{attachment.id}']", 'foo.png'

    end

  end