t2

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
 html = %(<div class="field_with_errors">#{html_tag}</div>).html_safe
 # add nokogiri gem to Gemfile
 elements = Nokogiri::HTML::DocumentFragment.parse(html_tag).css "label, input"
 elements.each do |e|
   if e.node_name.eql? 'label'
     html = %(<div class="clearfix error">#{e}</div>).html_safe
   elsif e.node_name.eql? 'input'
     if instance.error_message.kind_of?(Array)
       html = %(<div class="clearfix error">#{html_tag}<span class="help-inline">&nbsp;#{instance.error_message.join(',')}</span></div>).html_safe

zhengjia

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')