test_rfc3339

# File lib/time.rb, line 577
    def test_rfc3339
      t = Time.utc(1985, 4, 12, 23, 20, 50, 520000)
      s = "1985-04-12T23:20:50.52Z"
      assert_equal(t, Time.iso8601(s))
      assert_equal(s, t.iso8601(2))

      t = Time.utc(1996, 12, 20, 0, 39, 57)
      s = "1996-12-19T16:39:57-08:00"
      assert_equal(t, Time.iso8601(s))
      # There is no way to generate time string with arbitrary timezone.
      s = "1996-12-20T00:39:57Z"
      assert_equal(t, Time.iso8601(s))
      assert_equal(s, t.iso8601)

      t = Time.utc(1990, 12, 31, 23, 59, 60)
      s = "1990-12-31T23:59:60Z"
      assert_equal(t, Time.iso8601(s))
      # leap second is representable only if timezone file has it.
      s = "1990-12-31T15:59:60-08:00"
      assert_equal(t, Time.iso8601(s))

      begin
        Time.at(-1)
      rescue ArgumentError
        # ignore
      else
        t = Time.utc(1937, 1, 1, 11, 40, 27, 870000)
        s = "1937-01-01T12:00:27.87+00:20"
        assert_equal(t, Time.iso8601(s))
      end
    end