RSpec 3 compatible Pundit matcher ported from http://thunderboltlabs.com/blog/2013/03/27/testing-pundit-policies-with-rspec/

pundit_matcher.rb

module PunditExampleGroup
  extend ::RSpec::Matchers::DSL

  matcher :permit do |action|
    match do |policy|
      policy.public_send("#{action}?")
    end

    failure_message do |policy|
      "#{policy.class} does not permit #{action} on #{policy.record} for #{policy.user.inspect}."
    end

    failure_message_when_negated do |policy|
      "#{policy.class} does not forbid #{action} on #{policy.record} for #{policy.user.inspect}."
    end
  end
end

RSpec.configure do |config|
  config.include(PunditExampleGroup, {
    :type => :policy,
    :file_path => /spec\/policies/,
  })
end

Great! Thanks for writing the original article. It was super helpful.