Add feature spec to validate load all and select all exchange products

spec/features/admin/order_cycles_spec.rb

@@ -522,6 +522,45 @@ feature '
     expect(page).not_to have_selector 'table.exchanges tr.supplier'
   end
 
+  describe "editing an order cycle with multiple pages of products", js: true do
+    let(:order_cycle) { create(:order_cycle) }
+    let(:supplier_enterprise) { order_cycle.exchanges.incoming.first.sender }
+    let!(:new_product) { create(:product, supplier: supplier_enterprise) }
+
+    before do
+      stub_const("Api::ExchangeProductsController::DEFAULT_PER_PAGE", 1)
+
+      quick_login_as_admin
+      visit admin_order_cycle_incoming_path(order_cycle)
+      expect(page).to have_content "1 / 2 selected"
+
+      page.find("tr.supplier-#{supplier_enterprise.id} td.products").click
+      expect(page).to have_selector ".exchange-product-details"
+
+      expect(page).to have_content "1 of 2 Products Loaded"
+      expect(page).to_not have_content new_product.name
+    end
+
+    scenario "load all products" do
+      page.find(".exchange-load-all-variants a").click
+
+      expect_all_products_loaded
+    end
+
+    scenario "select all products" do
+      check "order_cycle_incoming_exchange_0_select_all_variants"
+
+      expect_all_products_loaded
+
+      expect(page).to have_checked_field "order_cycle_incoming_exchange_0_variants_#{new_product.variants.first.id}", disabled: false
+    end
+
+    def expect_all_products_loaded
+      expect(page).to have_content new_product.name.upcase
+      expect(page).to have_content "2 of 2 Products Loaded"
+    end
+  end
+
   scenario "updating many order cycle opening/closing times at once", js: true do
     # Given three order cycles
     oc1 = create(:simple_order_cycle)