public void Should_detect_options()
        {
            var p = new OptionSet();

            var n = p.AddFlag("n", "");
            var a = p.AddFlag("a", "");
            var b = p.AddFlag("b", "");

            var myArgs = "-n -a".Split(' ');
            p.Parse(myArgs);

            Assert.IsTrue(n);
            Assert.IsTrue(a);
            Assert.IsFalse(b);
        }