public void ByFormField_UnderscoresNodes()
{
var errors = new ValidationErrors();
errors.AddError("some-error", new ValidationError("some-error", "1", "some error"));
errors.AddError("some-error", new ValidationError("some-error", "2", "some other error"));
var nestedErrors = new ValidationErrors();
nestedErrors.AddError("some-nested-error", new ValidationError("some-nested-error", "3", "some nested error"));
nestedErrors.AddError("some-nested-error", new ValidationError("some-nested-error", "4", "some other nested error"));
var nestedNestedErrors = new ValidationErrors();
nestedNestedErrors.AddError("some-nested-nested-error", new ValidationError("some-nested-nested-error", "5", "some nested nested error"));
nestedNestedErrors.AddError("some-nested-nested-error", new ValidationError("some-nested-nested-error", "6", "some other nested nested error"));
nestedErrors.AddErrors("some-nested-object", nestedNestedErrors);
errors.AddErrors("some-object", nestedErrors);
Dictionary<string, List<string>> formErrors = errors.ByFormField();
Assert.AreEqual("some error", formErrors["some_error"][0]);
Assert.AreEqual("some other error", formErrors["some_error"][1]);
Assert.AreEqual("some nested error", formErrors["some_object[some_nested_error]"][0]);
Assert.AreEqual("some other nested error", formErrors["some_object[some_nested_error]"][1]);
Assert.AreEqual("some nested nested error", formErrors["some_object[some_nested_object][some_nested_nested_error]"][0]);
Assert.AreEqual("some other nested nested error", formErrors["some_object[some_nested_object][some_nested_nested_error]"][1]);
}