integrator_decorator.rb

Spree::Shipment.class_eval do
  def send_shipped_email
    unless Rails.env.production?
      ::Spree::ShipmentMailer.shipped_email(self.id).deliver
    end
  end
end

Spree::Order.class_eval do
  def deliver_order_confirmation_email
    unless Rails.env.production?
      begin
        ::Spree::OrderMailer.confirm_email(self.id).deliver
      rescue Exception => e
        logger.error("#{e.class.name}: #{e.message}")
        logger.error(e.backtrace * "\n")
      end
    end
  end

  def after_cancel
    restock_items!

    unless Rails.env.production?
      ::Spree::OrderMailer.cancel_email(self.id).deliver
      unless %w(partial shipped).include?(shipment_state)
        self.payment_state = 'credit_owed'
      end
    end
  end
end