Change route for iterations at the group level in right sidebar

ee/app/helpers/ee/groups_helper.rb

@@ -143,9 +143,13 @@ module EE
         links << :productivity_analytics
       end
 
-      if ::Feature.enabled?(:group_iterations, @group, default_enabled: true) && @group.licensed_feature_available?(:iterations) && can?(current_user, :read_iteration, @group)
+      if ::Feature.enabled?(:group_iterations, @group, default_enabled: true) && @group.licensed_feature_available?(:iterations)
+        if ::Feature.enabled?(:iteration_cadences, @group, default_enabled: :yaml) && can?(current_user, :read_iteration_cadence, @group)
+          links << :iteration_cadences
+        elsif can?(current_user, :read_iteration, @group)
           links << :iterations
         end
+      end
 
       if ::Feature.enabled?(:group_ci_cd_analytics_page, @group, default_enabled: true) && @group.licensed_feature_available?(:group_ci_cd_analytics) && can?(current_user, :view_group_ci_cd_analytics, @group)
         links << :group_ci_cd_analytics

ee/app/helpers/ee/nav_helper.rb

@@ -32,7 +32,13 @@ module EE
     end
 
     def iterations_sub_menu_controllers
-      ['iterations#index', 'iterations#show']
+      paths = ['iterations#index', 'iterations#show']
+
+      if ::Feature.enabled?(:iteration_cadences, @group, default_enabled: :yaml)
+        paths << 'iteration_cadences#index'
+      end
+
+      paths
     end
   end
 end

ee/app/views/layouts/nav/sidebar/_group_iterations_link.html.haml

-- if group_sidebar_link?(:iterations)
+- if group_sidebar_link?(:iteration_cadences) || group_sidebar_link?(:iterations)
+  - iterations_path = Feature.enabled?(:iteration_cadences, @group, default_enabled: :yaml) ? group_iteration_cadences_path(@group) : group_iterations_path(@group)
   = nav_link(path: iterations_sub_menu_controllers) do
-    = link_to group_iterations_path(@group), data: { qa_selector: 'group_iterations_link' } do
+    = link_to iterations_path, data: { qa_selector: 'group_iterations_link' } do
       %span
         = _('Iterations')

ee/spec/helpers/ee/groups_helper_spec.rb

@@ -102,6 +102,27 @@ RSpec.describe GroupsHelper do
         expect(helper.group_sidebar_links).not_to include(:group_ci_cd_analytics)
       end
     end
+
+    context 'when iterations is available' do
+      before do
+        stub_licensed_features(iterations: true)
+        stub_feature_flags(iteration_cadences: false)
+      end
+
+      it 'shows iterations link' do
+        expect(helper.group_sidebar_links).to include(:iterations)
+      end
+
+      context 'when iteration_cadences is available' do
+        before do
+          stub_feature_flags(iteration_cadences: true)
+        end
+
+        it 'shows iterations link' do
+          expect(helper.group_sidebar_links).to include(:iteration_cadences)
+        end
+      end
+    end
   end
 
   describe '#render_setting_to_allow_project_access_token_creation?' do

ee/spec/helpers/ee/nav_helper_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe NavHelper do
+  describe '#iterations_sub_menu_controllers' do
+    context 'when :iteration_cadences is turned on' do
+      it 'includes iteration_cadences#index path in the list' do
+        expect(helper.iterations_sub_menu_controllers).to include('iteration_cadences#index')
+      end
+    end
+
+    context 'when :iteration_cadences is NOT turned on' do
+      before do
+        stub_feature_flags(iteration_cadences: false)
+      end
+
+      it 'includes iteration_cadences#index path in the list' do
+        expect(helper.iterations_sub_menu_controllers).not_to include('iteration_cadences#index')
+      end
+    end
+  end
+end