public void OptionalTests()
{
var a = new Option<string>();
Assert.IsFalse(a.IsSet);
Assert.Throws<UnexpectedObjectException>(() => a.Unwrap());
Assert.AreEqual("Oi", a.UnwrapOr("Oi"));
var b = new Option<string>("Hello, World!");
Assert.IsTrue(b.IsSet);
Assert.AreEqual("Hello, World!", b.Unwrap());
Assert.AreEqual("Hello, World!", b.UnwrapOr("Goodbye!"));
var c = new Option<int>(5);
Assert.AreEqual(42, c.Map((x) => new Option<int>(37 + x)).Unwrap());
var d = new Option<int>();
Assert.IsFalse(d.Map((x) => new Option<int>(x)).IsSet);
Assert.AreEqual(42, d.MapOr(42, (x) => x));
Assert.AreEqual(42, d.MapOrElse((x) => x, () => c.MapOr(0, (x) => 37 + x)));
Assert.IsFalse(a.And(b).IsSet);
Assert.IsTrue(b.And(c).IsSet);
Assert.AreEqual(5, b.And(c).Unwrap());
Assert.IsTrue(a.Or(b).IsSet);
Assert.AreEqual(b.Or(a), a.Or(b));
Assert.AreEqual(5, d.Or(c).Unwrap());
Assert.AreEqual(5, c.OrElse(() => new Option<int>(42)).Unwrap());
Assert.AreEqual(42, d.OrElse(() => new Option<int>(42)).Unwrap());
}
public void And()
{
Option <int> opt1 = new Some <int>(1);
Assert.Equal(2, opt1.And(new Some <int>(2)).Unwrap());
Assert.Equal(None <int> .Instance, opt1.And(None <int> .Instance));
Option <int> opt2 = None <int> .Instance;
Assert.Equal(None <int> .Instance, opt2.And(new Some <int>(2)));
Assert.Equal(None <int> .Instance, opt2.And(None <int> .Instance));
}
public void SomeNone()
{
Option <int> some0 = Option.Some(0), some1 = Option.Some(1), none = Option.None <int>();
Assert.IsFalse(some0.IsNone);
Assert.IsTrue(some1.IsSome);
Assert.AreEqual(0, some0.Unwrap());
Assert.AreEqual(some0, some0.Or(none));
Assert.AreEqual(some0, some0.Or(some1));
Assert.AreEqual(some0, none.Or(some0));
Assert.AreEqual(none, none.And(some0));
Assert.AreEqual(some1, some0.And(some1));
Assert.AreEqual(none, some0.Xor(some1));
Assert.AreEqual(none, none.Xor(none));
Assert.AreEqual(some0, some0.Xor(none));
Assert.AreEqual(some0, none.Xor(some0));
Assert.AreEqual(0, some1.Match(_ => 0, () => 1));
Assert.AreEqual(1, none.Match(_ => 0, () => 1));
Assert.ThrowsException <Exception>(() => none.Unwrap());
}
