Redmine

        attachments = obj.attachments if obj && obj.respond_to?(:attachments)

        attachments = (attachments.to_a + @attachments).compact if (controller_name == 'previews' || action_name == 'preview') && @attachments.present?

        if attachments.present? && (attachment = Attachment.latest_attach(attachments, filename))

  def test_preview_issue_notes_should_view_thumbnail_of_the_file_after_attachment

    attachment = Attachment.generate!(filename: 'foo.bar', digest: 'd')

    attachment.update(container: nil)

    @request.session[:user_id] = 2

    post(

      :issue,

      params: {

        project_id: '1',

        issue_id: 1,

        field: 'notes',

        text: '{{thumbnail(foo.bar)}}',

        attachments: {'1': { token: attachment.token }}

      }

    )

    assert_response :success

    assert_select 'a.thumbnail[title=?]', 'foo.bar'

  end