class RSpec::Expectations::Differ

def object_to_string(object)
  case object
  when Hash
    object.keys.sort_by { |k| k.to_s }.map do |key|
      pp_key   = PP.singleline_pp(key, "")
      pp_value = PP.singleline_pp(object[key], "")
      # on 1.9.3 PP seems to minimise to US-ASCII, ensure we're matching source encoding
      #
      # note, PP is used to ensure the ordering of the internal values of key/value e.g.
      # <# a: b: c:> not <# c: a: b:>
      encoding = pick_encoding pp_key, pp_value
      matching_encoding("#{pp_key} => #{pp_value}", encoding)
    end.join(",\n")
  when String
    object =~ /\n/ ? object : object.inspect
  else
    PP.pp(object,"")
  end
end