public static void WhenPassingInRandomLettersReturnTheCorrectSequence()
{
ISequenceGenerator generator = new EncryptingSequenceGenerator();
Assert.Equal("vwxyzabcdefghijklmnopqrstu", generator.GenerateSequence("V"));
Assert.Equal("defghijklmnopqrstuvwxyzabc", generator.GenerateSequence("d"));
Assert.Equal("rstuvwxyzabcdefghijklmnopq", generator.GenerateSequence("R"));
}
public static void WhenPassingInACharacterThatDoesntExistThrowOutOfRangeException()
{
ISequenceGenerator generator = new EncryptingSequenceGenerator();
Assert.Throws <ArgumentOutOfRangeException>(() => generator.GenerateSequence("@"));
}