Add custom tab on shop

app/helpers/shop_helper.rb

@@ -27,9 +27,19 @@ module ShopHelper
       { name: 'producers', title: t(:shopping_tabs_producers), show: true },
       { name: 'contact', title: t(:shopping_tabs_contact), show: true },
       { name: 'groups', title: t(:shopping_tabs_groups), show: show_groups_tabs? },
+      custom_tab,
     ].select{ |tab| tab[:show] }
   end
 
+  def custom_tab
+    {
+      name: current_distributor.custom_tab&.title&.parameterize,
+      title: current_distributor.custom_tab&.title,
+      show: current_distributor.custom_tab.present?,
+      custom: true,
+    }
+  end
+
   def shop_tab_names
     shop_tabs.map { |tab| tab[:name] }
   end

app/views/shopping_shared/_tabs.html.haml

@@ -12,4 +12,7 @@
     - shop_tabs.each do |tab|
       %div{id: "#{tab[:name]}_panel", "data-tabs-and-panels-target": "panel #{'default' if tab[:default]}" } 
         .page-view
-          = render "shopping_shared/tabs/#{tab[:name]}"
+          - if tab[:custom]
+            = render "shopping_shared/tabs/custom", order: @order
+          - else
+            = render "shopping_shared/tabs/#{tab[:name]}"

app/views/shopping_shared/tabs/_custom.html.haml

@@ -0,0 +1,3 @@
+.content
+  .row
+    = @distributor.custom_tab.content

spec/system/consumer/white_label_spec.rb

@@ -352,4 +352,32 @@ describe 'White label setting' do
       end
     end
   end
+
+  context "manage the custom tab preference" do
+    context "when the distributor has a custom tab" do
+      let(:custom_tab) { create(:custom_tab) }
+
+      before do
+        distributor.update(custom_tab: custom_tab)
+        visit main_app.enterprise_shop_path(distributor)
+      end
+
+      it "shows the custom tab on shop page" do
+        expect(page).to have_selector(".tab-buttons .page", count: 5)
+        expect(page).to have_content custom_tab.title
+      end
+
+      it "shows the custom tab content when clicking on tab title" do
+        click_link custom_tab.title
+        expect(page).to have_content custom_tab.content
+      end
+    end
+
+    context "when the distributor has no custom tab" do
+      it "does not show the custom tab on shop page" do
+        visit main_app.enterprise_shop_path(distributor)
+        expect(page).to have_selector(".tab-buttons .page", count: 4)
+      end
+    end
+  end
 end