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Gem Version Test

Percy visual testing for Ruby Selenium.


npm install @percy/cli:

$ npm install --save-dev @percy/cli

gem install percy-capybara package:

$ gem install percy-capybara


In your test setup file, require percy/capybara. For example if you're using rspec, you would add the following to your spec_helper.rb file:

require 'percy/capybara'

Now you can use page.percy_snapshot to capture snapshots.

Note: you may need to add js: true to your specs, depending on your driver setup

describe 'my feature, type: :feature do
  it 'renders the page' do
    visit ''
    page.percy_snapshot('Capybara snapshot')

Running the test above normally will result in the following log:

[percy] Percy is not running, disabling snapshots

When running with percy exec, and your project's PERCY_TOKEN, a new Percy build will be created and snapshots will be uploaded to your project.

$ export PERCY_TOKEN=[your-project-token]
$ percy exec -- [test command]
[percy] Percy has started!
[percy] Created build #1:[your-project]
[percy] Snapshot taken "Capybara example"
[percy] Stopping percy...
[percy] Finalized build #1:[your-project]
[percy] Done!


page.snapshot(name[, options])


Automatically with @percy/migrate

We built a tool to help automate migrating to the new CLI toolchain! Migrating can be done by running the following commands and following the prompts:

$ npx @percy/migrate
? Are you currently using percy-capybara? Yes
? Install @percy/cli (required to run percy)? Yes
? Migrate Percy config file? Yes
? Upgrade SDK to percy-capybara@^5.0.0? Yes
? The Capybara API has breaking changes, automatically convert to the new API? Yes

This will automatically run the changes described below for you, with the exception of changing the require.


Require change

The name of the require has changed from require 'percy' to require 'percy/capybara'. This is to avoid conflict with our Ruby Selenium SDK's require statement.

API change

The previous version of this SDK had the following function signature:

Percy.snapshot(driver, name, options)

v5.x of this SDK has a significant change to the API. There no longer is a stand alone module to call and you no longer need to pass the page/driver. It's available on the current Capybara session (page):

page.percy_snapshot(name, options)

If you were using this SDK outside of Capybara, you'll likely find the Ruby Selenium SDK a better fit

Installing @percy/cli & removing @percy/agent

If you're coming from a 4.x version of this package, make sure to install @percy/cli after upgrading to retain any existing scripts that reference the Percy CLI command. You will also want to uninstall @percy/agent, as it's been replaced by @percy/cli.

$ npm uninstall @percy/agent
$ npm install --save-dev @percy/cli

Migrating config

If you have a previous Percy configuration file, migrate it to the newest version with the config:migrate command:

$ percy config:migrate