To test the generated HTML site, you can use `html-proofer` gem.

This Ruby gem checks and validates the jekyll generated HTML files.

It checks a broad set of points: internal and external links existence (alerting of possible 404 errors), HTML attributes of the images and so on.

To install it, It has been incorporated in the Gemfile so the previous dependency install command would have already installed it.

You can run the following gem to tests the generated site.

```bash

bundle exec jekyll build

bundle exec htmlproofer ./_site

A utility script has also been included to run these checks in a CI system smoothly.

./scripts/cibuild