Jekyll

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Covered in this doc

How to integrate Percy into a Jeykll static site

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Requirements

Node 10.0.0 or higher
A PERCY_TOKEN. Your token can be found on your Percy project settings page

Environment setup

The first step is to make your PERCY_TOKEN available in your environment. The percy package relies on the PERCY_TOKEN environment variable for authenticating and authorizing access to each project.

On Linux and Mac, run:

$ export PERCY_TOKEN=aaabbbcccdddeeefff

On Windows, run:

$ set PERCY_TOKEN=aaabbbcccdddeeefff

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Important

Keep your PERCY_TOKEN secret. Anyone with access to your token can consume your account quota, though they cannot read data.

Generating snapshots

Before your site can be visually tested with Percy, you must build your Jekyll site. If you're using the defaults provided by Jeykll, your built site is output into a _site/ directory.

$ bundle exec jekyll build

To take snapshots of the built site, simply run:

$ npx percy snapshot _site/

And that's it! Percy will create a build and snapshot by default all of the HTML files inside _site/.

For example:

$ npx percy snapshot _site/
Creating build...
percy has started.
serving static site at http://localhost:5339/
snapshot taken: 'http://localhost:5339/index.html'
snapshot taken: 'http://localhost:5339/404.html'
snapshot taken: 'http://localhost:5339/contact.html'
shutting down static site at http://localhost:5339/
stopping percy...
done! 
finalized build...

CI Configuration

You can do the above steps locally for testing, but to get continuous visual integration for your static site you’ll need to run the npx percy snapshot _site/ command in CI.

You'll also want to make sure your PERCY_TOKEN is setup for that run. See the CI setup guides for how to securely set environment variables in your CI service.

An example CircleCI .circleci/config.yml file might look something like the config below. We have added a few comments throughout the file to explain:

version: 2.1
jobs:
  test:
    docker:
      - image: circleci/ruby:2.6.3-node-browsers # Make sure your image has both `node` and is able to launch a browser
    steps:
      - checkout
      - run:
          name: Install dependencies
          command: bundle install
      - run:
          name: Build the static site
          command: bundle exec jekyll build
      - run:
          name: Visual Tests
          command: npx percy snapshot _site # snapshot built Jekyll site
workflows:
  version: 2.1
  build_and_test:
    jobs:
      - test

Advanced configuration

Changing the base url

Jeykll allows you to set the path your built site becomes hosted at by configuring a baseurl option in the _config.yml file.

If you have configured a baseurl, you will want to also pass that as a command line option to the snapshot command. For example, if your site outputs to _site and your baseurl is set to blog, you'll pass the --base-url /blog flag.

$ npx percy snapshot _site/ --base-url /blog

Ignoring files

You may want to exclude a section of your website from being visually tested. You can configure this with the --ignore-files flag.

For example, let's say you want to snapshot everything on your website except draft blog posts. You can do so like this:

$ npx percy snapshot _site/ --ignore-files blog/drafts/**

Example Integration

A reference integration of Percy and Jeykll is available.