Automatically take full page screenshots of failed Capybara test failures in RSpec 3

rails_helper.rb

# rails_helper.rb
RSpec.configure do |config|

  # other config 
  
  config.after(:each, js: true) do |example|
    if example.exception
      meta = example.metadata
      name = "test-failure-#{File.basename(meta[:file_path])}-#{meta[:line_number]}.png"

      self.page.save_screenshot(screenshot_path, full: true)
      $stdout << "\n Screenshot Taken: " + [Rails.root.join("tmp", "capybara"), name].join("/")
    end
  end
end