public void HexToCustomBase64()
        {
            var encoder        = new MugEncoder();
            var customBase64_1 = encoder.ToCustomBase64(testHex_1);
            var customBase64_2 = encoder.ToCustomBase64(testHex_2);

            Assert.Equal(testCustomBase64_1, customBase64_1);
            Assert.Equal(testCustomBase64_2, customBase64_2);
        }
        public void HexToCustomBase64InvalidNull()
        {
            string hex     = null;
            var    encoder = new MugEncoder();
            string customBase64;

            Assert.Throws <ArgumentNullException>(() => customBase64 = encoder.ToCustomBase64(hex));
        }
        public void HexToCustomBase64Invalid()
        {
            var    hex     = "g53464a0";
            var    encoder = new MugEncoder();
            string customBase64;

            Assert.Throws <ArgumentException>(() => customBase64 = encoder.ToCustomBase64(hex));
        }