public void Should_Valid_When_MaleOrFemailIsSaved()
        {
            var sut = PatientSex.Create("maLe");

            Assert.Equal("male", sut.Value);

            var sut2 = PatientSex.Create("feMaLe");

            Assert.Equal("female", sut2.Value);
        }
 public void Should_ErrorValidation_When_UnwantedSexIsSaved()
 {
     Assert.Throws <FluentValidation.ValidationException>(() => PatientSex.Create("boom boom"));
 }