def read_cache_fixtures!
      files = cache_files
      files.each do |file|
        cache_key = get_cache_key_from_filename(file)
        responses[cache_key] = Marshal.load(File.read(file))
      end
    end
def read_cache_fixtures!
      files = cache_files
      files.each do |file|
        cache_key = get_cache_key_from_filename(file)
        responses[cache_key] = Marshal.load(File.read(file))
      end
    end
Reads in the cache fixture files to in-memory cache.