public void OptionAll()
{
// Option with value
var optionInt = Option <int> .Some(12);
Assert.IsTrue(optionInt.All(intValue => intValue == 12));
Assert.IsFalse(optionInt.All(intValue => intValue == 13));
// Empty option
Option <int> emptyOptionInt = Option.None;
Assert.IsFalse(emptyOptionInt.All(intValue => intValue == 12));
// ReSharper disable once ReturnValueOfPureMethodIsNotUsed
Assert.Throws <ArgumentNullException>(() => optionInt.All(null));
}