helper to investigate request test response HTML with nokogiri

def pp_response(at: 'main')
  puts "#{rand(100..999).to_s * 100}RESPONSE"
  puts "Check RubyMine `Console` tab for the output" if ENV["EDITOR"] == "rubymine"
  doc = Nokogiri::HTML5(body)
  doc.at(at) # at <main> tag by default
  puts doc.to_xhtml(indent: 2)
end

in request spec:

it do 
  get '/foo'
  pp_response
end