Spec admin display of Taler payment actions

This should satisfy code coverage.

spec/factories/order_factory.rb

@@ -238,6 +238,8 @@ FactoryBot.define do
   factory :completed_order_with_fees, parent: :order_with_distributor do
     transient do
       payment_fee { 5 }
+      payment_calculator { build(:calculator_per_item, preferred_amount: payment_fee) }
+      payment_method { build(:payment_method, calculator: payment_calculator) }
       shipping_fee { 3 }
       shipping_tax_category { nil }
     end
@@ -250,11 +252,9 @@ FactoryBot.define do
       product = create(:simple_product)
       create(:line_item, order:, product:)
 
-      payment_calculator = build(:calculator_per_item, preferred_amount: evaluator.payment_fee)
-      payment_method = create(:payment_method, calculator: payment_calculator)
       create(:payment, order:,
                        amount: order.total,
-                       payment_method:,
+                       payment_method: evaluator.payment_method,
                        state: 'checkout')
 
       create(:shipping_method_with, :shipping_fee, shipping_fee: evaluator.shipping_fee,

spec/support/table_helper.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+module TableHelper
+  # Selector for table row that has the given string
+  def row_containing(value)
+    find(:xpath, "(//tr[contains(., '#{value}')])")
+  end
+end

spec/system/admin/payments_taler_spec.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+require 'system_helper'
+
+RSpec.describe "Admin -> Order -> Payments" do
+  include AuthenticationHelper
+  include TableHelper
+
+  let(:distributor) { build(:distributor_enterprise) }
+  let(:order) { create(:completed_order_with_fees, distributor:, payments: [payment]) }
+  let(:payment) {
+    build(:payment, :completed, payment_method: taler, source: taler, response_code: "taler-id-1")
+  }
+  let(:taler) {
+    Spree::PaymentMethod::Taler.new(
+      name: "Taler",
+      distributors: [distributor],
+      environment: "test",
+      preferred_backend_url: "https://taler.example.com",
+      preferred_api_key: "sandbox",
+    )
+  }
+
+  before do
+    login_as distributor.owner
+  end
+
+  it "allows to refund a Taler payment" do
+    order_status = {
+      order_status: "paid",
+      contract_terms: {
+        amount: "KUDOS:2",
+      }
+    }
+    order_endpoint = "https://taler.example.com/private/orders/taler-id-1"
+    refund_endpoint = "https://taler.example.com/private/orders/taler-id-1/refund"
+    stub_request(:get, order_endpoint).to_return(body: order_status.to_json)
+    stub_request(:post, refund_endpoint).to_return(body: "{}")
+
+    visit spree.admin_order_payments_path(order.number)
+
+    within row_containing("Taler") do
+      expect(page).to have_text "COMPLETED"
+      expect(page).to have_link class: "icon-void"
+
+      click_link class: "icon-void"
+
+      expect(page).to have_text "VOID"
+      expect(page).not_to have_link class: "icon-void"
+    end
+  end
+end