public void SelectTest()
{
Either <int, Exception> i = 123;
Either <int, Exception> e = new ArgumentException("Hi");
Either <double, string> d = i.Select(x => (double)x, y => y.Message);
Either <double, string> s = e.Select(x => (double)x, y => y.Message);
Assert.AreEqual(123.0, d.Value);
Assert.AreEqual("Hi", s.Value);
}
