HTMLProofer will test your rendered HTML files to make sure they're accurate.
It is a set of tests to validate your HTML output. These tests check if your image references are legitimate, if they have alt tags, if your internal links are working, and so on. It's intended to be an all-in-one checker for your output.
Install from a RubyGems gem (with RubyGems or Bundler)
Make sure all dependencies are installed: libcurl.
GemfileAdd the following to your Gemfile:
gem install html-proofer