Add spec for return authorizations controller

spec/controllers/spree/admin/return_authorizations_controller_spec.rb

@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+module Spree
+  module Admin
+    describe ReturnAuthorizationsController, type: :controller do
+      include AuthenticationWorkflow
+
+      let(:order) do
+        create(:order, :with_line_item, :completed,
+               distributor: create(:distributor_enterprise) )
+      end
+
+      before do
+        login_as_admin
+
+        # Pay the order
+        order.payments.first.complete
+        order.updater.update_payment_state
+
+        # Ship the order
+        order.reload.shipment.ship!
+      end
+
+      it "creates and updates a return authorization" do
+        # Create return authorization
+        spree_post :create, order_id: order.number,
+                            return_authorization: { amount: "20.2", reason: "broken" }
+
+        expect(response).to redirect_to spree.admin_order_return_authorizations_url(order.number)
+        return_authorization = order.return_authorizations.first
+        expect(return_authorization.amount.to_s).to eq "20.2"
+        expect(return_authorization.reason.to_s).to eq "broken"
+
+        # Update return authorization
+        spree_put :update, id: return_authorization.id,
+                           return_authorization: { amount: "10.2", reason: "half broken" }
+
+        expect(response).to redirect_to spree.admin_order_return_authorizations_url(order.number)
+        return_authorization.reload
+        expect(return_authorization.amount.to_s).to eq "10.2"
+        expect(return_authorization.reason.to_s).to eq "half broken"
+      end
+    end
+  end
+end