assert_equal

# File lib/test/unit/assertions.rb, line 144
      def assert_equal(exp, act, msg = nil)
        msg = message(msg) {
          exp_str = mu_pp(exp)
          act_str = mu_pp(act)
          exp_comment = ''
          act_comment = ''
          if exp_str == act_str
            if (exp.is_a?(String) && act.is_a?(String)) ||
               (exp.is_a?(Regexp) && act.is_a?(Regexp))
              exp_comment = " (#{exp.encoding})"
              act_comment = " (#{act.encoding})"
            elsif exp.is_a?(Float) && act.is_a?(Float)
              exp_str = "%\#.#{Float::DIG+2}g" % exp
              act_str = "%\#.#{Float::DIG+2}g" % act
            elsif exp.is_a?(Time) && act.is_a?(Time)
              if exp.subsec * 1000_000_000 == exp.nsec
                exp_comment = " (#{exp.nsec}[ns])"
              else
                exp_comment = " (subsec=#{exp.subsec})"
              end
              if act.subsec * 1000_000_000 == act.nsec
                act_comment = " (#{act.nsec}[ns])"
              else
                act_comment = " (subsec=#{act.subsec})"
              end
            elsif exp.class != act.class
              # a subclass of Range, for example.
              exp_comment = " (#{exp.class})"
              act_comment = " (#{act.class})"
            end
          elsif !Encoding.compatible?(exp_str, act_str)
            if exp.is_a?(String) && act.is_a?(String)
              exp_str = exp.dump
              act_str = act.dump
              exp_comment = " (#{exp.encoding})"
              act_comment = " (#{act.encoding})"
            else
              exp_str = exp_str.dump
              act_str = act_str.dump
            end
          end
          "<#{exp_str}>#{exp_comment} expected but was\n<#{act_str}>#{act_comment}"
        }
        assert(exp == act, msg)
      end