Translate Taler payment status to error message

app/models/spree/payment_method/taler.rb

@@ -56,8 +56,9 @@ module Spree
         taler_order = client.fetch_order(payment.response_code)
         status = taler_order["order_status"]
         success = (status == "paid")
+        message = I18n.t(status, default: status, scope: "taler.order_status")
 
-        ActiveMerchant::Billing::Response.new(success, status)
+        ActiveMerchant::Billing::Response.new(success, message)
       end
 
       private

config/locales/en.yml

@@ -288,6 +288,9 @@ en:
     success_code:
       disconnected: "Stripe account disconnected."
 
+  taler:
+    order_status:
+      claimed: "The payment request expired. Please try again."
   activemodel:
     errors:
       messages:

spec/models/spree/payment_method/taler_spec.rb

@@ -5,20 +5,48 @@ require 'spec_helper'
 RSpec.describe Spree::PaymentMethod::Taler do
   subject(:taler) {
     Spree::PaymentMethod::Taler.new(
-      preferred_backend_url: "https://backend.demo.taler.net/instances/sandbox",
+      preferred_backend_url: backend_url,
       preferred_api_key: "sandbox",
     )
   }
+  let(:backend_url) { "https://backend.demo.taler.net/instances/sandbox" }
 
   describe "#external_payment_url", vcr: true do
     it "retrieves a URL to pay at and stores it on the payment record" do
       order = create(:order_ready_for_confirmation, payment_method: taler)
       url = subject.external_payment_url(order:)
-      expect(url).to match %r{\Ahttps://backend.demo.taler.net/instances/sandb}
+      expect(url).to start_with backend_url
 
       payment = order.payments.last.reload
       expect(payment.response_code).to match "2026.022-0284X4GE8WKMJ"
       expect(payment.redirect_auth_url).to eq url
     end
   end
+
+  describe "#purchase" do
+    let(:money) { 100 }
+    let(:source) { taler }
+    let(:payment) { build(:payment, response_code: "taler-order-7") }
+    let(:order_url) { "#{backend_url}/private/orders/taler-order-7" }
+
+    it "returns an ActiveMerchant response" do
+      order_status = "paid"
+      stub_request(:get, order_url).to_return(body: { order_status: }.to_json)
+
+      response = taler.purchase(nil, nil, payment:)
+
+      expect(response.success?).to eq true
+      expect(response.message).to eq "paid"
+    end
+
+    it "translates error messages" do
+      order_status = "claimed"
+      stub_request(:get, order_url).to_return(body: { order_status: }.to_json)
+
+      response = taler.purchase(nil, nil, payment:)
+
+      expect(response.success?).to eq false
+      expect(response.message).to eq "The payment request expired. Please try again."
+    end
+  end
 end