public void ShouldNotDec()
{
StringIncrementer s;
s = new StringIncrementer();
Assert.ThrowsException <ArgumentOutOfRangeException>(() => s.Dec(null));
Assert.ThrowsException <ArgumentOutOfRangeException>(() => s.Dec(Token.MinStringValue));
}
public void ShouldDec()
{
StringIncrementer s;
s = new StringIncrementer();
Assert.AreEqual("a", s.Dec("b"));
Assert.AreEqual("aa", s.Dec("ab"));
Assert.AreEqual(string.Empty, s.Dec("\0"));
Assert.AreEqual("\uFFFF", s.Dec("\uFFFF\u0000"));
}