Take screenshot on capybara's every browser action.

capybara_steps.rb

class Capybara::Session
  %i(visit click_on fill_in).each do |method_name|
    original_method_name = "old_#{method_name}".to_sym
    alias_method original_method_name, method_name
    define_method method_name do |*args|
      return_value = send original_method_name, *args
      save_screenshot(save_path)
      increment_counter
      return_value
    end

    private

    def save_path
      timestamp = Time.new.strftime("%Y%m%d%H%M%S")
      name_parts = ['step', '%03d' % counter, timestamp, rand(10**10)]
      "steps/#{@s_now ||= timestamp}/#{name_parts.join(?_)}.png"
    end

    def increment_counter
      @counter = counter + 1
    end

    def counter
      @counter || 1
    end
  end
end