jslint via capybara-webkit

jslint_test.rb

require 'test_helper'

class JslintTest < ActionDispatch::IntegrationTest
  include ActionView::Helpers::JavaScriptHelper
  
  ['file1', 'file2', 'file3'].each do |path|
    path.gsub!(/^app\/assets\/javascripts\//, "")
    path += '.js'
    test "JSLINT #{path}" do
      assert_jslint(path)
    end
  end

  private
  def assert_jslint(path)
    path = "/assets/#{path}"
    options = {
      white: true,
      undef: true,
      sloppy: true,
      vars: true,
      nomen: true,
      newcap: true,
      maxerr: 20
    }
    jslint = File.read(Rails.root.join(*%w(vendor assets javascripts jslint.js)))
    visit path
 
    doc = Nokogiri::HTML(page.body)
    source = doc.css('pre').first.content

    visit 'about:blank'
    page.execute_script jslint

    if !page.evaluate_script %{JSLINT("#{escape_javascript source}", #{options.to_json})}
      page.evaluate_script(%{JSLINT.errors}).each do |error|
        puts %{\n#{path}:#{error['line']}@#{error['character']}: #{error['reason']}\n#{error['evidence']}}
      end
      flunk 'JSLINT Errors'
    end
  end
end