class RuboCop::ConfigValidator

def validate_new_cops_parameter
  new_cop_parameter = @config.for_all_cops['NewCops']
  return if new_cop_parameter.nil? || NEW_COPS_VALUES.include?(new_cop_parameter)
  message = "invalid #{new_cop_parameter} for `NewCops` found in" \
            "#{smart_loaded_path}\n" \
            "Valid choices are: #{NEW_COPS_VALUES.join(', ')}"
  raise ValidationError, message
end