Travis CI: Build and test Jekyll website using HTMLProofer

.travis.yml

language: ruby

rvm: 2.3.3

branches:
  only:
  - master

script: bundle exec rake test

env:
  global:
  - NOKOGIRI_USE_SYSTEM_LIBRARIES=true

Gemfile

source 'https://rubygems.org'

gem 'github-pages'
gem 'wdm', '>= 0.1.0' if Gem.win_platform?

group :test do
  gem 'rake'
  gem 'html-proofer'
end

Rakefile

require 'html-proofer'

desc "build and test website"
task :test do
  sh "bundle exec jekyll build"
  HTMLProofer.check_directory(
    "./_site",
    {
      :typhoeus => {
        :followlocation => true,
        :ssl_verifypeer => false,
        :headers => {
          'User-Agent' => 'html-proofer'
        }
      }
    }
  ).run
end