Stub or provide mailer as appropriate

spec/controllers/admin/proxy_orders_controller_spec.rb

@@ -74,6 +74,7 @@ describe Admin::ProxyOrdersController, type: :controller do
 
     before do
       # Processing order to completion
+      allow(Spree::OrderMailer).to receive(:cancel_email) { double(:email, deliver: true) }
       order.update_attribute(:shipping_method_id, shipping_method.id)
       while !order.completed? do break unless order.next! end
       proxy_order.update_attribute(:canceled_at, Time.zone.now)

spec/mailers/order_mailer_spec.rb

@@ -1,6 +1,8 @@
 require 'spec_helper'
 
 describe Spree::OrderMailer do
+  let!(:mail_method) { create(:mail_method, preferred_mails_from: 'spree@example.com') }
+
   describe "order confimation" do
     after do
       ActionMailer::Base.deliveries.clear
@@ -20,10 +22,6 @@ describe Spree::OrderMailer do
       ship_address = create(:address, :address1 => "distributor address", :city => 'The Shire', :zipcode => "1234")
       @order1 = create(:order, :distributor => @distributor, :bill_address => @bill_address, ship_address: ship_address, :special_instructions => @shipping_instructions)
       ActionMailer::Base.deliveries = []
-      Spree::MailMethod.create!(
-        environment: Rails.env,
-        preferred_mails_from: 'spree@example.com'
-      )
     end
 
     describe "for customers" do

spec/models/proxy_order_spec.rb

@@ -23,6 +23,7 @@ describe ProxyOrder, type: :model do
         let(:order) { create(:completed_order_with_totals) }
 
         it "returns true and sets canceled_at to the current time, and cancels the order" do
+          expect(Spree::OrderMailer).to receive(:cancel_email) { double(:email, deliver: true) }
           expect(proxy_order.cancel).to be true
           expect(proxy_order.reload.canceled_at).to be_within(5.seconds).of Time.now
           expect(order.reload.state).to eq 'canceled'
@@ -89,8 +90,11 @@ describe ProxyOrder, type: :model do
       end
 
       context "and the order has already been cancelled" do
-        before { while !order.completed? do break unless order.next! end }
-        before { order.cancel }
+        before do
+          allow(Spree::OrderMailer).to receive(:cancel_email) { double(:email, deliver: true) }
+          while !order.completed? do break unless order.next! end
+          order.cancel
+        end
 
         it "returns true, clears canceled_at and resumes the order" do
           expect(proxy_order.resume).to be true
@@ -126,8 +130,11 @@ describe ProxyOrder, type: :model do
       end
 
       context "and the order has been cancelled" do
-        before { while !order.completed? do break unless order.next! end }
-        before { order.cancel }
+        before do
+          allow(Spree::OrderMailer).to receive(:cancel_email) { double(:email, deliver: true) }
+          while !order.completed? do break unless order.next! end
+          order.cancel
+        end
 
         it "returns false and does nothing" do
           expect(proxy_order.resume).to eq false