protected string GetErrorMessageForAttributeBasedConfigiguredItem <T>(T model, string propertyName)
{
// arrange
Registry.Setup(x => x.GetModelPropertyMetadata(model.GetType(), propertyName)).Returns((ModelMetadataItem)null);
// act
var modelTemp = model;
var metadata = Provider.GetMetadataForProperty(() => modelTemp, model.GetType(), propertyName);
var validator = metadata.GetValidators(new ControllerContext()).First();
// assert
return(validator.GetClientValidationRules().First().ErrorMessage);
}