public void MapFailureToDifferentType()
{
var one = Failable <bool, int> .Failure(1);
Failable <bool, string> onePlusOne = one.MapFailure(i => $"{i}+1=2");
Assert.That(onePlusOne.FailureOrThrow(), Is.EqualTo("1+1=2"));
}
public void ConvertToFailable_None()
{
var maybe = Maybe <string> .None;
Failable <string, ArgumentException> failable = maybe.ToFailable(new ArgumentException("msg"));
Assert.That(failable.IsFailure, Is.True);
Assert.That(failable.FailureOrThrow().Message, Is.EqualTo("msg"));
}