public void TestEnumerable()
{
Option <int> none = Option.None;
Assert.AreEqual(0, none.Count());
Assert.AreEqual(0, none.Aggregate(0, (sum, x) => sum + x));
var some = Option.Some <int>(3);
Assert.AreEqual(1, some.Count());
Assert.AreEqual(3, some.Aggregate(0, (sum, x) => sum + x));
}
public void OptionAggregate()
{
// Option with value
var optionInt = Option <int> .Some(12);
Assert.AreEqual(15, optionInt.Aggregate(3, (intValue, initValue) => intValue + initValue));
// Empty option
Option <int> emptyOptionInt = Option.None;
Assert.AreEqual(3, emptyOptionInt.Aggregate(3, (intValue, initValue) => intValue + initValue));
// ReSharper disable ReturnValueOfPureMethodIsNotUsed
Assert.Throws <ArgumentNullException>(() => optionInt.Aggregate(1, null));
Assert.Throws <ArgumentNullException>(() => optionInt.Aggregate((Person)null, (person, int32) => null));
Assert.Throws <ArgumentNullException>(() => optionInt.Aggregate((Person)null, null));
// ReSharper restore ReturnValueOfPureMethodIsNotUsed
}
private static void TestIEnumerableHelper(Option<int> o)
{
var select = o.Select(x => x);
Assert.AreEqual(o.HasValue ? 1 : 0, select.Count());
select = o.Select((x, index) => x);
Assert.AreEqual(o.HasValue ? 1 : 0, select.Count());
var where = o.Where(x => true);
Assert.AreEqual(o.HasValue ? 1 : 0, where.Count());
where = o.Where((x, index) => true);
Assert.AreEqual(o.HasValue ? 1 : 0, where.Count());
var toArr = o.ToArray();
Assert.AreEqual(o.HasValue ? 1 : 0, toArr.Length);
if (o.HasValue)
{
var aggregate = o.Aggregate((acc, val) => acc + val);
Assert.AreEqual(o.ValueOrDefault, aggregate);
aggregate = o.Aggregate(0, (acc, val) => acc + val);
Assert.AreEqual(o.ValueOrDefault, aggregate);
}
bool run = false;
foreach (var obj in ((System.Collections.IEnumerable)o))
{
run = true;
Assert.AreEqual(1, (int)obj);
}
Assert.AreEqual(run, o.HasValue);
run = false;
o.ForEach((val) => run = true);
Assert.AreEqual(run, o.HasValue);
}