# File lib/fakefs/file.rb, line 504
    def chown(owner_int, group_int)
      return unless group_int && group_int != -1

      owner_int.is_a?(Fixnum) || fail(
        TypeError, "can't convert String into Integer")
      @file.uid = owner_int

      group_int.is_a?(Fixnum) || fail(
        TypeError, "can't convert String into Integer")
      @file.gid = group_int
    end