static void Success()
{
var guid = System.Guid.NewGuid();
Assert.Equal(TryParse.Guid(guid.ToString()), Some(guid));
Assert.Equal(TryParse.Guid(guid.ToString("X"), "X"), Some(guid));
}
static void Null()
{
Assert.Equal(TryParse.Guid(null), None());
Assert.Equal(TryParse.Guid(null, "dd/MM/yyyy"), None());
}
static void Fail()
{
Assert.Equal(TryParse.Guid("ab"), None());
Assert.Equal(TryParse.Guid("ab", "X"), None());
}