public void ModelBaseWithFieldValidationTest()
{
var personViewModel = new PersonViewModelWithModel { Person = new Person { FirstName = "Igr Alexánder", LastName = string.Empty } };
// I have to add this call here
((IModelValidation)personViewModel).Validate();
var validationSummary = personViewModel.GetValidationContext().GetValidationSummary("Person");
Assert.IsTrue(validationSummary.HasErrors);
}