Select by default single Hub/Shop option on creation of payment/shipping method

- added a helper
- added mode(new/edit) in payment/shipping views
- updated checkbox creation
- added tests

spec/features/admin/payment_method_spec.rb

@@ -67,6 +67,21 @@ feature '
         expect(page).to have_selector "#stripe-account-status .charges_enabled", text: "Charges Enabled: Yes"
       end
     end
+
+    scenario "checking a single distributor is checked by default" do
+      2.times.each { Enterprise.last.destroy }
+      quick_login_as_admin
+      visit spree.new_admin_payment_method_path
+      expect(page).to have_field "payment_method_distributor_ids_#{@distributors[0].id}", checked: true
+    end
+
+    scenario "checking more than a distributor displays no default choice" do
+      quick_login_as_admin
+      visit spree.new_admin_payment_method_path
+      expect(page).to have_field "payment_method_distributor_ids_#{@distributors[0].id}", checked: false
+      expect(page).to have_field "payment_method_distributor_ids_#{@distributors[1].id}", checked: false
+      expect(page).to have_field "payment_method_distributor_ids_#{@distributors[2].id}", checked: false
+    end
   end
 
   scenario "updating a payment method", js: true do

spec/features/admin/shipping_methods_spec.rb

@@ -65,6 +65,20 @@ feature 'shipping methods' do
       expect(page).to have_content "That shipping method cannot be deleted as it is referenced by an order: #{o.number}."
       expect(Spree::ShippingMethod.find(@sm.id)).not_to be_nil
     end
+
+    scenario "checking a single distributor is checked by default" do
+      d1 = Enterprise.first
+      visit spree.new_admin_shipping_method_path
+      expect(page).to have_field "shipping_method_distributor_ids_#{d1.id}", checked: true
+    end
+
+    scenario "checking more than a distributor displays no default choice" do
+      d1 = create(:distributor_enterprise, name: 'Aeronautical Adventures')
+      d2 = create(:distributor_enterprise, name: 'Nautical Travels')
+      visit spree.new_admin_shipping_method_path
+      expect(page).to have_field "shipping_method_distributor_ids_#{d1.id}", checked: false
+      expect(page).to have_field "shipping_method_distributor_ids_#{d2.id}", checked: false
+    end
   end
 
   context "as an enterprise user", js: true do