no_animations.rb

# frozen_string_literal: true

# disable CSS3 and jQuery animations in test mode for speed, consistency and avoiding timing issues.
# Usage for Rails:
# in config/environments/test.rb
# config.middleware.use Rack::NoAnimations
class Build::Middleware::NoAnimations
  def initialize(app)
    @app = app
  end

  def call(env)
    @status, @headers, @body = @app.call(env)
    return [@status, @headers, @body] unless html?
    response = Rack::Response.new([], @status, @headers)

    @body.each { |fragment| response.write inject(fragment) }
    @body.close if @body.respond_to?(:close)

    response.finish
  end

  private

  def html?
    @headers['Content-Type'] =~ /html/
  end

  def inject(fragment)
    disable_animations = <<~EOF
      <script type="text/javascript">
        if (typeof window.jQuery !== 'undefined') {
          window.jQuery(() => {
              window.jQuery.support.transition = false;
              if (typeof window.jQuery.fx !== 'undefined') {
                window.jQuery.fx.off = true;
              }
          });
        }
      </script>
      <style>
        * {
           -o-transition: .0s !important;
           -moz-transition: .0s !important;
           -ms-transition: .0s !important;
           -webkit-transition: .0s !important;
           transition: .0s !important;
           -o-transform: .0s !important;
           -moz-transform: .0s !important;
           -ms-transform: .0s !important;
           -webkit-transform: .0s !important;
           transform: .0s !important;
           -webkit-animation: .0s !important;
           -moz-animation: .0s !important;
           -o-animation: .0s !important;
           -ms-animation: .0s !important;
           animation: .0s !important;
        }
      </style>
    EOF
    fragment.gsub('</body>', disable_animations + '</body>')
  end
end