module Cosinux
  module PageCacheTest
  
    def self.included(base) #:nodoc:
      ActionController::Base.public_class_method :page_cache_path
      ActionController::Base.perform_caching = true
    end

    # asserts that the list of given url are being cached
    # - it first makes sure each url is not cached,
    # - then if a block is given, it yields it, otherwise it executes a get request on each url,
    # - and finally it asserts that the url are cached.
    def assert_cache(*urls)
      silence do
        urls.each do |url|
          ActionController::Base.expire_page(url)
        end
      end

      if block_given?
        yield *urls
      else
        urls.each { |url| get url }
      end

      urls.each do |url|
        assert_block("#{url.inspect} is not cached after executing block") do
          File.exists? page_cache_path(url)
        end
      end
    end

    # asserts that the list of given url are being expired
    # - it first makes sure each url is cached,
    # - then it yields the block
    # - and finally it asserts that the urls are expired
    def assert_expire(*urls)
      silence do
        urls.each do |url|
          ActionController::Base.cache_page("testing", url)
        end
      end

      yield *urls

      urls.each do |url|
        assert_block("#{url.inspect} is cached after executing block") do
          ! File.exists? page_cache_path(url)
        end
      end
    end


    private
    def page_cache_path(url)
      ActionController::Base.page_cache_path(url)
    end

    def silence
      logger = ActionController::Base.logger
      old_logger_level, logger.level = logger.level, Logger::ERROR if logger
      yield
    ensure
      logger.level = old_logger_level if logger
    end

  end
end