Percy wait_for_animation for JavaScript animations

feature_spec_with_animation.rb

RSpec.feature :homepage, js: true do
  def finished_all_animations?
    page.evaluate_script('$(":animated").length') == 0
  end

  def wait_for_animation
    Timeout.timeout(Capybara.default_wait_time) do
      sleep 0.1 until finished_all_animations?
    end
  end

  scenario 'user clicks toggle and section appears' do
    visit '/'
    find('#toggle-post-dialog').click
    wait_for_animation
    expect(page).to have_content('Share')

    Percy::Capybara.snapshot(page, name: 'homepage with input')
  end
end