shared_steps.rb

Then /^I should see a form for "(.+)" containing (.+) fields$/ do |object, methods|
  fields = methods.scan(/(\w+)(?:,|\sand\s|\s)?/).flatten
  response.should have_selector(:form) do |form|
    fields.each do |field|
      form.to_s.should have_selector("input", :id => "#{object}_#{field}")
    end
  end
end