class Airbrake::Config::Validator

def check_notify_ability(config)
  promise = Airbrake::Promise.new
  unless config.error_notifications
    return promise.reject('error notifications are disabled')
  end
  if ignored_environment?(config)
    return promise.reject(
      "current environment '#{config.environment}' is ignored",
    )
  end
  promise.resolve(:ok)
end