public void TestCustomAlphabetConversionUsingStandardDigits() { var alphabet = "0123456789"; var bigInt = BigInteger.Parse("144413047667920780076747050081956537466"); var str = ConvertEx.ToCustomAlphabetString(bigInt, alphabet); str.ShouldBe("144413047667920780076747050081956537466"); var decoded = ConvertEx.FromCustomAlphabetString(str, alphabet); decoded.ShouldBe(bigInt); }