public void BasicEncodeTest()
        {
            var message  = "HELPMEIAMUNDERATTACK";
            var expected = "HENTEIDTLAEAPMRCMUAK";
            var actual   = Scytale.Encode(message, 4);

            Assert.That(actual, Is.EqualTo(expected));
        }
 public string TestFailingEncodeTests(string message, int colSize) => Scytale.Encode(message, colSize);