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Covered in this doc

Integrating Percy with your CircleCI environment
Configuring your CircleCI Orb for parallelized builds

Integrating Percy with your CircleCI environment

Configuring environment variables

In your CircleCI project, go to Project settings > Environment Variables.

Then set PERCY_TOKEN to the write-only token from your Percy project. This token can be found in your Percy project's settings.

Alternative config.yml setup

A different way is to add the environment variables to your config.yml. See the CircleCI: Using Environment Variables docs for more info.

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Keep your Percy token secret

Anyone with access to your token can add builds to your project, though they cannot read data.

If your code is public, do not add the PERCY_TOKEN to your code and use the above environment setup instead.

Parallelized Tests - Configuring your CircleCI Orb

If you run your tests in parallel, use our CircleCI orb to signal when all parallel tests have completed. Integrating Percy with CircleCI is made easy with our percy/agent CircleCI orb.

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The CircleCI orb is only for parallel builds

You will only need to use the CircleCI orb if you're running multiple Percy builds in CI

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CircleCI Orbs require CircleCI configuration version 2.1 or higher.

How it works

The workflow you'll be aiming for is the following:

Environment variables

• PERCY_PARALLEL_TOTAL: this must be set to -1. This tells Percy we don't know how parallelized this run is, but we'll consider your Percy build fully wrapped up when we hear the percy/finalize_all command from the Orb.
• PERCY_TOKEN: This is the token obtained from your project settings in Percy.

There are a number of different ways you can set these environment variables to be available on each step. See CircleCI's Environment Variable Usage Options documentation for more information.

Workflow configuration

Your CircleCI workflow configuration at a high level should look like this:

version: 2.1

orbs:
 percy: percy/[email protected]

jobs:
 run_tests:
   parallelism: 3
   steps:
     - attach_workspace:
         at: .
     - run: echo "your tests run here"

workflows:
 test:
   jobs:
     - run_tests
     - percy/finalize_all:
         requires:
           - run_tests

We first import the percy/agent orb and then once all tests have finished, execute percy/finalize_all command from the Orb. Make sure you use the latest version of the orb from CircleCI's registry.

Here's a sample of what this looks like integrated into the percy-web project:

Additional resources

We teamed up with the CircleCI team for a live demo of our integrated workflow. Watch the recording of the session below to learn more about our CircleCI orb, and see a live visual testing demo.