Remove order link in non-user failed payment email

app/views/subscription_mailer/failed_payment_email.html.haml

@@ -2,9 +2,10 @@
 
 %p.callout
   = t("email_so_failed_payment_explainer_html", distributor: @order.distributor.name)
-  = t("email_so_edit_false_html",
-    orders_close_at: l(@order.order_cycle.orders_close_at, format: mail_long_datetime_format),
-    order_url: spree.order_url(@order))
+  - if @order.user.present?
+    = t("email_so_edit_false_html",
+      orders_close_at: l(@order.order_cycle.orders_close_at, format: mail_long_datetime_format),
+      order_url: spree.order_url(@order))
   = t("email_so_contact_distributor_html", distributor: @order.distributor.name, email: @order.distributor.contact.email)
 
 - if @order.errors.any?

spec/mailers/subscription_mailer_spec.rb

@@ -129,7 +129,8 @@ describe SubscriptionMailer do
   end
 
   describe "failed payment notification" do
-    let(:subscription) { create(:subscription, with_items: true) }
+    let(:customer) { create(:customer) }
+    let(:subscription) { create(:subscription, customer: customer, with_items: true) }
     let(:proxy_order) { create(:proxy_order, subscription: subscription) }
     let!(:order) { proxy_order.initialise_order! }
 
@@ -150,6 +151,29 @@ describe SubscriptionMailer do
       expect(body).to include strip_tags(details)
       expect(body).to include "This is a payment failure error"
     end
+
+    describe "linking to order page" do
+      let(:order_link_href) { "href=\"#{spree.order_url(order)}\"" }
+
+      let(:email) { SubscriptionMailer.deliveries.last }
+      let(:body) { email.body.encoded }
+
+      context "when the customer has a user account" do
+        let(:customer) { create(:customer) }
+
+        it "provides link to view details" do
+          expect(body).to match /#{order_link_href}/
+        end
+      end
+
+      context "when the customer has no user account" do
+        let(:customer) { create(:customer, user: nil) }
+
+        it "does not provide link" do
+          expect(body).to_not match /#{order_link_href}/
+        end
+      end
+    end
   end
 
   describe "order placement summary" do