Feature-test payments report

This report displays order balances and we'll need this basic
feature-test coverage to ensure it keeps working once we refactor them.

lib/open_food_network/payments_report.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module OpenFoodNetwork
   class PaymentsReport
     attr_reader :params

spec/features/admin/reports/payments_report_spec.rb

@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe "Payments Reports" do
+  include AuthenticationHelper
+
+  let!(:order) do
+    create(
+      :order_with_distributor,
+      state: 'complete',
+      completed_at: Time.zone.now,
+      order_cycle: order_cycle
+    )
+  end
+  let(:order_cycle) { create(:simple_order_cycle) }
+  let!(:line_item) do
+    create(:line_item_with_shipment, order: order, product: product)
+  end
+  let(:product) { create(:product, supplier: supplier) }
+  let(:supplier) { create(:supplier_enterprise) }
+
+  before { login_as_admin }
+
+  it 'shows orders with payment state, their balance and totals' do
+    visit spree.payments_admin_reports_path
+
+    select I18n.t(:report_itemised_payment), from: "report_type"
+    find("[type='submit']").click
+
+    expect(page.find("#listing_orders thead tr").text).to eq([
+      I18n.t(:report_header_payment_state),
+      I18n.t(:report_header_distributor),
+      I18n.t(:report_header_product_total_price, currency: currency_symbol),
+      I18n.t(:report_header_shipping_total_price, currency: currency_symbol),
+      I18n.t(:report_header_outstanding_balance_price, currency: currency_symbol),
+      I18n.t(:report_header_total_price, currency: currency_symbol)
+    ].join(" "))
+
+    expect(page.find("#listing_orders tbody tr").text).to eq([
+      order.payment_state,
+      order.distributor.name,
+      order.item_total.to_f,
+      order.ship_total.to_f,
+      order.outstanding_balance.to_f,
+      order.total.to_f
+    ].join(" "))
+  end
+end