Module: PercyCapybara

Defined in:
lib/percy/version.rb,
lib/percy/capybara.rb

Constant Summary collapse

VERSION = 
'5.0.1.pre.2'.freeze
PERCY_DEBUG = 
ENV['PERCY_LOGLEVEL'] == 'debug'
PERCY_SERVER_ADDRESS = 
ENV['PERCY_SERVER_ADDRESS'] || 'http://localhost:5338'
PERCY_LABEL = 
"[\u001b[35m" + (PERCY_DEBUG ? 'percy:capybara' : 'percy') + "\u001b[39m]"

Instance Method Summary collapse

Instance Method Details

#percy_snapshot(name, options = {}) ⇒ Object

Take a DOM snapshot and post it to the snapshot endpoint



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# File 'lib/percy/capybara.rb', line 24

def percy_snapshot(name, options = {})
  return unless percy_enabled?

  page = Capybara.current_session

  begin
    percy_dom_script = fetch_percy_dom
    page.evaluate_script(percy_dom_script)
    dom_snapshot = get_serialized_dom(page, options, percy_dom_script)
    page.evaluate_script(fetch_percy_dom)

    # Readiness gate -- runs before serialize when CLI supports it.
    # Uses evaluate_async_script with a callback signal so the SDK can block
    # on PercyDOM.waitForReady. In-browser typeof guard makes this a no-op on
    # older CLIs that lack waitForReady.
    readiness_diagnostics = wait_for_ready(page, options)

    dom_snapshot = page
      .evaluate_script("(function() { return PercyDOM.serialize(#{options.to_json}) })()")

    if readiness_diagnostics && dom_snapshot.is_a?(Hash)
      dom_snapshot['readiness_diagnostics'] = readiness_diagnostics
    end

    response = fetch('percy/snapshot',
      name: name,
      url: page.current_url,
      dom_snapshot: dom_snapshot,
      client_info: CLIENT_INFO,
      environment_info: ENV_INFO,
      **options,)

    data =
      begin
        JSON.parse(response.body)
      rescue JSON::ParserError => e
        log("Could not parse snapshot response for '#{name}': invalid JSON")
        if PERCY_DEBUG then log(e) end
        return
      end

    unless data['success']
      raise StandardError, data['error']
    end
  rescue StandardError => e
    log("Could not take DOM snapshot '#{name}'")

    if PERCY_DEBUG then log(e) end
  end
end