Testing Activation Emails with Capybara, RSpec and Custom Matcher. I wrote blog post which is here: http://tuom.as/2013/11/20/testing-activation-emails-with-capybara-rspec-and-custom-matcher.html

activation_email_spec.rb

require 'spec_helper'

describe "Activation Email" do
  it "confirms the email when user clicks the confirmation link on activation email" do
    register_new_user("john.smith@example.com", "adobe password", "adobe password")
    activation_token = User.last.activation_code
    expect( open_last_email.body).to have_link_with_endswith(activation_token)
    visit activation_path(activation_token)
    expect(page).to have_content( "Your email has been confirmed.")
  end
end

have_link_endswith.rb

# spec/features/support/have_link_endswith.rb
module Capybara
  module RSpecMatchers
    class HaveLinkEndswith < Matcher
      attr_reader :matching_value

      def initialize(*args)
        @matching_value = args.first
      end

      def matches?(actual)
        @actual = wrap(actual)
        @actual.has_selector?( :css, "a[href$='#{matching_value}']")
      end

      def does_not_match?(actual)
        @actual = wrap(actual)
        @actual.has_no_selector?( :css, "a[href$='#{matching_value}']")
      end

      def failure_message_for_should
        "expected there be a link which href ends with #{matching_value.inspect} in #{@actual.text}"
      end

      def failure_message_for_should_not
        "expected there not be a link which href ends with #{matching_value.inspect} in #{@actual.text}"
      end

      def description
        "link with href that ends with #{format(content)}"
      end
    end

    def have_link_that_endswith(*args)
      HaveLinkEndswith.new(*args)
    end
  end
end

Hi, thank you very much for this, it has helped me solve a problem.

I have had to make some minor changes to your code to make it work with the latest versions of the gems used. - specifically:

• failure_message_for_should is now failure_message
• failure_message_for_should_not is now failure_message_when_negated
• open_last_email.body is now open_last_email.default_part_body

And I've also changed the method and class names of the matcher to have_link_that_ends_with and HaveLinkEndsWith - but that's a personal preference thing.

You can see all the changes I've made here: https://gist.github.com/LimeBlast/edcfe156c5d719eaea1e

Again, thank you.