Configure the load path so all dependencies in your Gemfile can be required

require 'rubygems'
require 'bundler/setup'
require 'nokogiri'

Only add gems from specified groups to the load path. If you want the gems in the default group, make sure to include it

require 'rubygems'
require 'bundler'
Bundler.setup(:default, :ci)
require 'nokogiri'