Add spec to test receiving a redirect from stripe with a valid payment intent id

spec/controllers/checkout_controller_spec.rb

@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe CheckoutController, type: :controller do
-  let(:distributor) { double(:distributor) }
+  let(:distributor) { create(:distributor_enterprise, with_payment_and_shipping: true) }
   let(:order_cycle) { create(:simple_order_cycle) }
   let(:order) { create(:order) }
   let(:reset_order_service) { double(ResetOrderService) }
@@ -36,7 +36,7 @@ describe CheckoutController, type: :controller do
     expect(flash[:info]).to eq("The hub you have selected is temporarily closed for orders. Please try again later.")
   end
 
-  describe "redirection to the cart" do
+  describe "redirection to cart and stripe" do
     let(:order_cycle_distributed_variants) { double(:order_cycle_distributed_variants) }
 
     before do
@@ -44,7 +44,7 @@ describe CheckoutController, type: :controller do
       allow(order).to receive(:distributor).and_return(distributor)
       order.order_cycle = order_cycle
 
-      allow(OrderCycleDistributedVariants).to receive(:new).with(order_cycle, distributor).and_return(order_cycle_distributed_variants)
+      allow(OrderCycleDistributedVariants).to receive(:new).and_return(order_cycle_distributed_variants)
     end
 
     it "redirects when some items are out of stock" do
@@ -62,12 +62,34 @@ describe CheckoutController, type: :controller do
       expect(response).to redirect_to cart_path
     end
 
-    it "does not redirect when items are available and in stock" do
-      allow(order).to receive_message_chain(:insufficient_stock_lines, :empty?).and_return true
-      expect(order_cycle_distributed_variants).to receive(:distributes_order_variants?).with(order).and_return(true)
+    describe "when items are available and in stock" do
+      before do
+        allow(order).to receive_message_chain(:insufficient_stock_lines, :empty?).and_return true
+      end
 
-      get :edit
-      expect(response).to be_success
+      it "does not redirect" do
+        expect(order_cycle_distributed_variants).to receive(:distributes_order_variants?).with(order).and_return(true)
+        get :edit
+        expect(response).to be_success
+      end
+
+      describe "when the order is in payment state and a stripe payment intent is provided" do
+        before do
+          order.update_attribute :state, "payment"
+          order.ship_address = create(:address)
+          order.save!
+          order.payments << create(:payment, state: "pending", response_code: "pi_123")
+
+          # this is called a 2nd time after order completion from the reset_order_service
+          expect(order_cycle_distributed_variants).to receive(:distributes_order_variants?).twice.and_return(true)
+        end
+
+        it "completes the order and redirects to the order confirmation page" do
+          get :edit, { payment_intent: "pi_123" }
+          expect(order.completed?).to be true
+          expect(response).to redirect_to spree.order_path(order)
+        end
+      end
     end
   end