class Object
  # Returns the name of a fixture file by adjoining the directory
  # of the +file+ argument with "fixtures" and the contents of the
  # +args+ array. For example,
  #
  #   +file+ == "some/example_spec.rb"
  #
  # and
  #
  #   +args+ == ["subdir", "file.txt"]
  #
  # then the result is the expanded path of
  #
  #   "some/fixtures/subdir/file.txt".
  def fixture(file, *args)
    path = File.dirname(file)
    path = path[0..-7] if path[-7..-1] == "/shared"
    fixtures = path[-9..-1] == "/fixtures" ? "" : "fixtures"
    if File.respond_to?(:realpath)
      path = File.realpath(path)
    else
      path = File.expand_path(path)
    end
    File.join(path, fixtures, args)
  end
end