Add max votable headings to groups

spec/features/admin/budget_groups_spec.rb

@@ -65,4 +65,49 @@ feature 'Admin can change the groups name' do
     expect(page).to have_content('has already been taken')
   end
 
+  context "Maximum votable headings" do
+
+    background do
+      3.times { create(:budget_heading, group: group) }
+    end
+
+    scenario "Defaults to 1 heading per group", :js do
+      visit admin_budget_path(group.budget)
+
+      within("#budget_group_#{group.id}") do
+        click_link 'Edit group'
+
+        expect(page).to have_select('budget_group_max_votable_headings', selected: '1')
+      end
+    end
+
+    scenario "Update", :js do
+      visit admin_budget_path(group.budget)
+
+      within("#budget_group_#{group.id}") do
+        click_link 'Edit group'
+
+        select '2', from: 'budget_group_max_votable_headings'
+        click_button 'Save group'
+      end
+
+      visit admin_budget_path(group.budget)
+
+      within("#budget_group_#{group.id}") do
+        click_link 'Edit group'
+
+        expect(page).to have_select('budget_group_max_votable_headings', selected: '2')
+      end
+    end
+
+    scenario "Do not display maxium votable headings' select in new form", :js do
+      visit admin_budget_path(group.budget)
+
+      click_link 'Add new group'
+
+      expect(page).to have_field('budget_group_name')
+      expect(page).to_not have_field('budget_group_max_votable_headings')
+    end
+
+  end
 end