public void OnField_WithValidationError()
{
ValidationErrors errors = new ValidationErrors();
errors.AddError("country_name", new ValidationError("country_name", "91803", "invalid country"));
Assert.AreEqual(ValidationErrorCode.ADDRESS_COUNTRY_NAME_IS_NOT_ACCEPTED, errors.OnField("country_name")[0].Code);
Assert.AreEqual("invalid country", errors.OnField("country_name")[0].Message);
}