Relative email links with Saucelabs and capybara/cucumber

My cucumber/capybara tests use pickle to click links within emails but I came across a slight issue when integrating with saucelabs. Saucelabs proxies requests through a different host than what our rails app uses. Our rails emails get the URL host from:

ActionMailer::Base.default_url_options[:host]

view raw action_mailer_default_url_options.rb hosted with ❤ by GitHub

This is most likely set to localhost:5000 or something like that. Saucelabs on the other hand seems to use a random host. The end result is that when we click the first link within our email, the test fails with a DNS error as the saucelabs selenium server tries to hit localhost:5000 which does not exist at saucelabs. Emailed the folks at saucelabs and they recommended converting links within the email from absolute to relative. Got it done by monkey patching pickle:

	module Pickle
	module Email
	def click_first_link_in_email(email)
	link = absolute_link_to_relative(links_in_email(email).first)
	visit link
	end
	def absolute_link_to_relative(link)
	link.slice(/#{ActionMailer::Base.default_url_options[:host]}(.*)/, 1)
	end
	end
	end

view raw pickle_email_links_relative.rb hosted with ❤ by GitHub

The absolute_link_to_relative method just slices off the hostname in the url using the String#slice method. The first argument is a regular expression built with the ActionMailer host configuration and the second is the capture number.