`have_link_ends_with` matcher

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.default_part_body ).to have_link_with_ends_with(activation_token)
    visit activation_path(activation_token)
    expect(page).to have_content( "Your email has been confirmed.")
  end
end

have_link_ends_with.rb

# spec/features/support/have_link_ends_with.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
        "expected there be a link which href ends with #{matching_value.inspect} in #{@actual.text}"
      end

      def failure_message_when_negated
        "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_ends_with(*args)
      HaveLinkEndsWith.new(*args)
    end
  end
end