public void ToResult_Theory(IMaybe <int> m1, string errString, IResult <int, string> expectation)
{
// arrange - theory
var result = m1.ToResult(errString);
// assert
Assert.Equal(expectation, result);
}
/// <summary>
/// Converts an <see cref="Maybe{T}" /> to an <see cref="Result{T,TError}" />.
/// </summary>
/// <param name="source">
/// The element from the <see cref="Maybe{T}" /> to be passed into <see cref="Result{T,TError}" />.
/// </param>
/// <param name="errorSelector">
/// A function to be executed if there is no value inside the <see cref="Maybe{T}" />.
/// </param>
/// <typeparam name="T">
/// The type inside the <see cref="Maybe{T}" />.
/// </typeparam>
/// <typeparam name="TError">
/// The type representing an error for the <see cref="Result{T,TError}" />.
/// </typeparam>
/// <returns></returns>
public static IResult <T, TError> ToResult <T, TError>(this IMaybe <T> source, Func <TError> errorSelector)
{
if (source is null)
{
throw new ArgumentNullException(nameof(source));
}
return(errorSelector is null
? throw new ArgumentNullException(nameof(errorSelector))
: source.ToResult(x => x.HasValue, x => errorSelector()).Map(x => x.Value));
}
public static IAsyncMaybe <T> ToMaybeAsync <T>(this IMaybe <T> source)
=> new AsyncMaybe <T>(
System.Threading.Tasks.Task.FromResult(source.ToResult(Unit.Selector)).ToAsyncResult()
);