gistfile1.rb

# Add config.include(Matchers) to your spec_helper.rb
# ability.should allow_to(:manage, Post)
#

module Matchers
  class CanCanMatcher
    def initialize(action, noun)
      @action, @noun = action, noun
    end

    def matches?(ability)
      ability.can?(@action, @noun)
    end

    def failure_message
      "expected ability to allow #{@action} on #{@noun}"
    end
    
    def negative_failure_message
      "expected ability to disallow #{@action} on #{@noun}"
    end
  end

  def allow_to(*args)
    CanCanMatcher.new(*args)
  end
end