public void AlternativeFailureYieldsSecond()
{
var expected = "second".AsEither <String, Exception>();
var actual = Either <String, Exception> .CreateError(new Exception("boo"))
.Alternatively("second".AsEither <String, Exception>());
Assert.Equal(expected, actual);
}
public void MapErrorSameTypes()
{
var expected = "NewError";
var initial = Either <string, string> .CreateError("Error");
var result = initial.MapError(_ => expected);
Assert.True(result.IsError);
Assert.False(result.IsSuccess);
Assert.Equal(expected, result.AsError.Value);
}
public void MapErrorSameFinalType()
{
var expected = DateTime.Now;
var initial = Either <DateTime, string> .CreateError("Error");
var result = initial.MapError(_ => expected);
Assert.True(result.IsError);
Assert.False(result.IsSuccess);
Assert.Equal(expected, result.AsError.Value);
}