gistfile1.rb

# Ripped from cucumber-0.8.3/examples/watir/features/support/screenshots.rb
module Screenshots
  if Cucumber::OS_X
    def embed_screenshot(id)
      `screencapture -t png reports/#{id}.png`
      embed("#{id}.png", "image/png")
    end
  else
    def embed_screenshot(id)
      `import -window root reports/#{id}.png`
      embed("#{id}.png", "image/png")
    end
  end
end
World(Screenshots)

After do |scenario|
  if scenario.failed? && defined?(Capybara) && Capybara.current_session
     embed_screenshot("screenshot-#{Time.new.to_i}")
  end
end