public void OnField_WorksWithAllCommonCasing()
{
ValidationError fieldError = new ValidationError("", "1", "");
ValidationErrors errors = new ValidationErrors();
errors.AddError("country_name", fieldError);
Assert.AreEqual(fieldError, errors.OnField("country_name")[0]);
Assert.AreEqual(fieldError, errors.OnField("country-name")[0]);
Assert.AreEqual(fieldError, errors.OnField("countryName")[0]);
Assert.AreEqual(fieldError, errors.OnField("CountryName")[0]);
}