Allow Vouchers feature per enterprise

I also kept the per-user check to be backwards-compatible. Some
instances have that enabled already. And for early testing, you may want
to test with only one user first before all customer see it.

app/views/admin/enterprises/_form.html.haml

@@ -10,7 +10,7 @@
       %legend= t(".#{ item[:name] }.legend")
 
   - when 'vouchers'
-    - if feature?(:vouchers, spree_current_user)
+    - if feature?(:vouchers, spree_current_user) || feature?(:vouchers, @enterprise)
       %fieldset.alpha.no-border-bottom{ id: "#{item[:name]}_panel", data: { "tabs-and-panels-target": "panel"  }}
         %legend= t(".#{ item[:form_name] || item[:name] }.legend")
         = render "admin/enterprises/form/#{ item[:form_name] || item[:name] }", f: f

app/views/admin/shared/_side_menu.html.haml

@@ -1,7 +1,7 @@
 .side_menu#side_menu
   - if @enterprise
     - enterprise_side_menu_items(@enterprise).each do |item|
-    - next if !item[:show] || (item[:name] == 'vouchers' && !feature?(:vouchers, spree_current_user))
+    - next if !item[:show] || (item[:name] == 'vouchers' && !(feature?(:vouchers, spree_current_user) || feature?(:vouchers, @enterprise)))
       %a.menu_item{ href: item[:href] || "##{item[:name]}_panel", id: item[:name], data: { action: "tabs-and-panels#changeActivePanel tabs-and-panels#changeActiveTab", "tabs-and-panels-target": "tab" }, class: item[:selected] }
         %i{ class: item[:icon_class] }
         %span= t(".enterprise.#{item[:name] }")

app/views/split_checkout/_payment.html.haml

@@ -1,5 +1,5 @@
 .medium-6#checkout-payment-methods
-  - if feature?(:vouchers, spree_current_user) && @order.distributor.vouchers.present?
+  - if (feature?(:vouchers, spree_current_user) || feature?(:vouchers, @order.distributor)) && @order.distributor.vouchers.present?
     %div.checkout-substep
       = render partial: "split_checkout/voucher_section", locals: { order: @order, voucher_adjustment: @order.voucher_adjustments.first }
 

lib/open_food_network/feature_toggle.rb

@@ -31,6 +31,7 @@ module OpenFoodNetwork
       DESC
       "vouchers" => <<~DESC,
         Add voucher functionality. Voucher can be managed via Enterprise settings.
+        This is activated per enterprise. Enter actors as <code>Enterprise;1234</code>.
       DESC
       "invoices" => <<~DESC,
         Preserve the state of generated invoices and enable multiple invoice numbers instead of only one live-updating invoice.

spec/lib/open_food_network/feature_toggle_spec.rb

@@ -14,6 +14,15 @@ describe OpenFoodNetwork::FeatureToggle do
       Flipper.enable(:foo)
       expect(feature_toggle.enabled?(:foo)).to be true
     end
+
+    it "can be activated per enterprise" do
+      enterprise = Enterprise.new(id: 5)
+
+      Flipper.enable(:foo, enterprise)
+
+      expect(feature_toggle.enabled?(:foo)).to eq false
+      expect(feature_toggle.enabled?(:foo, enterprise)).to eq true
+    end
   end
 
   describe ".setup!" do