Experiment: Add Billing to a top-level navigation item

app/helpers/tab_helper.rb

@@ -163,7 +163,7 @@ module TabHelper
     action = options.delete(:action)
 
     route_matches_paths?(options.delete(:path)) ||
-      route_matches_pages?(options.delete(:page)) ||
+      route_matches_page_without_exclusion?(options.delete(:page), options.delete(:exclude_page)) ||
       route_matches_controllers_and_or_actions?(controller, action)
   end
 
@@ -188,6 +188,13 @@ module TabHelper
     end
   end
 
+  def route_matches_page_without_exclusion?(pages, exclude_page)
+    return false unless route_matches_pages?(pages)
+    return true unless exclude_page.present?
+
+    !route_matches_pages?(exclude_page)
+  end
+
   def route_matches_pages?(pages)
     Array(pages).compact.any? do |single_page|
       # We need to distinguish between Hash argument and other types of

ee/app/controllers/groups/billings_controller.rb

@@ -21,7 +21,9 @@ class Groups::BillingsController < Groups::ApplicationController
       .new(plan: current_plan, namespace_id: relevant_group.id)
       .execute
 
-    unless @plans_data
+    if @plans_data
+      track_from_side_nav
+    else
       render 'shared/billings/customers_dot_unavailable'
     end
   end
@@ -48,4 +50,10 @@ class Groups::BillingsController < Groups::ApplicationController
     gitlab_subscription.refresh_seat_attributes!
     gitlab_subscription.save
   end
+
+  def track_from_side_nav
+    return unless helpers.accessed_billing_from_side_nav?
+
+    experiment(:billing_in_side_nav, user: current_user).track(:view, label: 'view_billing')
+  end
 end

ee/app/helpers/billing_plans_helper.rb

@@ -152,8 +152,49 @@ module BillingPlansHelper
     }
   end
 
+  def contact_sales_button_data(plan)
+    data = {
+      track_action: 'click_button',
+      track_label: 'contact_sales',
+      track_property: plan.code
+    }
+
+    add_billing_in_side_nav_attribute(data)
+  end
+
+  def billing_upgrade_button_data(plan)
+    data = {
+      track_action: 'click_button',
+      track_label: 'upgrade',
+      track_property: plan.code,
+      qa_selector: "upgrade_to_#{plan.code}"
+    }
+
+    add_billing_in_side_nav_attribute(data)
+  end
+
+  def start_free_trial_data
+    data = {
+      track_action: 'click_button',
+      track_label: 'start_trial',
+      qa_selector: 'start_your_free_trial'
+    }
+
+    add_billing_in_side_nav_attribute(data)
+  end
+
+  def accessed_billing_from_side_nav?
+    params[:from] == 'side_nav'
+  end
+
   private
 
+  def add_billing_in_side_nav_attribute(data)
+    return data unless accessed_billing_from_side_nav?
+
+    data.merge!(track_experiment: :billing_in_side_nav)
+  end
+
   def add_seats_url(group)
     return unless group
 

ee/app/views/shared/billings/_billing_plan_actions.html.haml

@@ -2,6 +2,12 @@
   - if Feature.enabled?(:in_app_hand_raise_pql, namespace)
     .js-hand-raise-lead-button{ data: hand_raise_props(namespace) }
   - else
-    = link_to s_('BillingPlan|Contact sales'), "#{contact_sales_url}?test=inappcontactsales#{plan.code}", class: ["btn gl-button", show_upgrade_button ? "btn-confirm-secondary" : "btn-confirm"], data: { 'track-action': 'click_button', 'track-label': 'contact_sales', 'track-property': plan.code }
+    = link_to s_('BillingPlan|Contact sales'),
+      "#{contact_sales_url}?test=inappcontactsales#{plan.code}",
+      class: ["btn gl-button", show_upgrade_button ? "btn-confirm-secondary" : "btn-confirm"],
+      data: contact_sales_button_data(plan)
 - if show_upgrade_button
-  = link_to upgrade_button_text(plan_offer_type), plan_purchase_or_upgrade_url(namespace, plan), class: ["btn btn-confirm gl-button", upgrade_button_css_classes(namespace, plan, is_current), "gl-ml-3"], data: { 'track-action': 'click_button', 'track-label': 'upgrade', 'track-property': plan.code, qa_selector: "upgrade_to_#{plan.code}" }
+  = link_to upgrade_button_text(plan_offer_type),
+    plan_purchase_or_upgrade_url(namespace, plan),
+    class: ["btn btn-confirm gl-button", upgrade_button_css_classes(namespace, plan, is_current), "gl-ml-3"],
+    data: billing_upgrade_button_data(plan)

ee/app/views/shared/billings/_billing_plan_header.html.haml

@@ -33,7 +33,11 @@
 
   - if show_start_free_trial_messages?(namespace)
     - glm_content = namespace_for_user ? 'user-billing' : 'group-billing'
-    %p= link_to 'Start your free trial', new_trial_registration_path(glm_source: 'gitlab.com', glm_content: glm_content), class: 'btn btn-confirm gl-button', data: { qa_selector: 'start_your_free_trial' }
+    %p
+      = link_to 'Start your free trial',
+        new_trial_registration_path(glm_source: 'gitlab.com', glm_content: glm_content),
+        class: 'btn btn-confirm gl-button',
+        data: start_free_trial_data
 
   - if show_extend_reactivate_trial_button?(namespace)
     .gl-mt-3

ee/config/feature_flags/experiment/billing_in_side_nav.yml

+---
+name: billing_in_side_nav
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/74934
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/344598
+milestone: '14.6'
+type: experiment
+group: group::conversion
+default_enabled: false

ee/lib/ee/sidebars/groups/menus/settings_menu.rb

@@ -7,6 +7,7 @@ module EE
         module SettingsMenu
           extend ::Gitlab::Utils::Override
           include ::Gitlab::Utils::StrongMemoize
+          include ::Gitlab::Experiment::Dsl
 
           override :configure_menu_items
           def configure_menu_items
@@ -115,10 +116,22 @@ module EE
               return ::Sidebars::NilMenuItem.new(item_id: :billing)
             end
 
+            local_active_routes = { path: 'billings#index' }
+
+            experiment(:billing_in_side_nav, user: context.current_user) do |e|
+              e.control {}
+              e.candidate do
+                local_active_routes = {
+                  page: group_billings_path(context.group),
+                  exclude_page: group_billings_path(context.group, from: :side_nav)
+                }
+              end
+            end
+
             ::Sidebars::MenuItem.new(
               title: _('Billing'),
               link: group_billings_path(context.group),
-              active_routes: { path: 'billings#index' },
+              active_routes: local_active_routes,
               item_id: :billing
             )
           end

ee/lib/ee/sidebars/groups/panel.rb

@@ -17,6 +17,18 @@ module EE
           insert_menu_after(::Sidebars::Groups::Menus::PackagesRegistriesMenu, ::Sidebars::Groups::Menus::AnalyticsMenu.new(context))
           insert_menu_after(::Sidebars::Groups::Menus::AnalyticsMenu, ::Sidebars::Groups::Menus::WikiMenu.new(context))
           insert_menu_after(::Sidebars::Groups::Menus::SettingsMenu, ::Sidebars::Groups::Menus::AdministrationMenu.new(context))
+          add_billing_sidebar_menu
+        end
+
+        private
+
+        def add_billing_sidebar_menu
+          experiment(:billing_in_side_nav, user: context.current_user) do |e|
+            e.control {}
+            e.candidate do
+              insert_menu_after(::Sidebars::Groups::Menus::AdministrationMenu, ::Sidebars::Groups::Menus::BillingMenu.new(context))
+            end
+          end
         end
       end
     end

ee/lib/ee/sidebars/projects/panel.rb

@@ -16,6 +16,19 @@ module EE
           if ::Sidebars::Projects::Menus::IssuesMenu.new(context).show_jira_menu_items?
             remove_menu(::Sidebars::Projects::Menus::ExternalIssueTrackerMenu)
           end
+
+          add_billing_sidebar_menu
+        end
+
+        private
+
+        def add_billing_sidebar_menu
+          experiment(:billing_in_side_nav, user: context.current_user) do |e|
+            e.control {}
+            e.candidate do
+              insert_menu_after(::Sidebars::Projects::Menus::SettingsMenu, ::Sidebars::Projects::Menus::BillingMenu.new(context))
+            end
+          end
         end
       end
     end

ee/lib/sidebars/groups/menus/administration_menu.rb

@@ -5,6 +5,7 @@ module Sidebars
     module Menus
       class AdministrationMenu < ::Sidebars::Menu
         include Gitlab::Utils::StrongMemoize
+        include ::Gitlab::Experiment::Dsl
 
         override :configure_menu_items
         def configure_menu_items
@@ -70,10 +71,22 @@ module Sidebars
             return ::Sidebars::NilMenuItem.new(item_id: :billing)
           end
 
+          local_active_routes = { path: 'billings#index' }
+
+          experiment(:billing_in_side_nav, user: context.current_user) do |e|
+            e.control {}
+            e.candidate do
+              local_active_routes = {
+                page: group_billings_path(context.group),
+                exclude_page: group_billings_path(context.group, from: :side_nav)
+              }
+            end
+          end
+
           ::Sidebars::MenuItem.new(
             title: _('Billing'),
             link: group_billings_path(context.group),
-            active_routes: { path: 'billings#index' },
+            active_routes: local_active_routes,
             item_id: :billing
           )
         end

ee/lib/sidebars/groups/menus/billing_menu.rb

+# frozen_string_literal: true
+
+module Sidebars
+  module Groups
+    module Menus
+      class BillingMenu < ::Sidebars::Menu
+        override :link
+        def link
+          group_billings_path(root_group, from: :side_nav)
+        end
+
+        override :title
+        def title
+          _('Billing')
+        end
+
+        override :sprite_icon
+        def sprite_icon
+          'credit-card'
+        end
+
+        override :render?
+        def render?
+          ::Gitlab::CurrentSettings.should_check_namespace_plan? &&
+            can?(context.current_user, :admin_namespace, root_group) &&
+            !root_group.user_namespace?
+        end
+
+        override :extra_container_html_options
+        def extra_container_html_options
+          {
+            class: 'shortcuts-billings'
+          }
+        end
+
+        override :extra_nav_link_html_options
+        def extra_nav_link_html_options
+          {
+            data: {
+              track_action: :render,
+              track_experiment: :billing_in_side_nav
+            }
+          }
+        end
+
+        override :active_routes
+        def active_routes
+          { page: group_billings_path(root_group, from: :side_nav) }
+        end
+
+        private
+
+        def root_group
+          context.group.root_ancestor
+        end
+      end
+    end
+  end
+end

ee/lib/sidebars/projects/menus/billing_menu.rb

+# frozen_string_literal: true
+
+module Sidebars
+  module Projects
+    module Menus
+      class BillingMenu < ::Sidebars::Groups::Menus::BillingMenu
+        private
+
+        def root_group
+          context.project.namespace.root_ancestor
+        end
+      end
+    end
+  end
+end

ee/spec/controllers/groups/billings_controller_spec.rb

@@ -63,6 +63,49 @@ RSpec.describe Groups::BillingsController, :saas do
           expect(response).to render_template('shared/billings/customers_dot_unavailable')
         end
       end
+
+      context 'when from billing link in side nav', :aggregate_failures, :experiment do
+        context 'when user comes from side nav billing link' do
+          before do
+            stub_experiments(billing_in_side_nav: :candidate)
+          end
+
+          it 'assigns the candidate experience and tracks the event' do
+            expect(experiment(:billing_in_side_nav)).to track(:view, label: 'view_billing')
+                                                                .for(:candidate)
+                                                                .with_context(user: user)
+                                                                .on_next_instance
+
+            get :index, params: { group_id: group, from: :side_nav }
+
+            expect(response).not_to render_template('shared/billings/customers_dot_unavailable')
+          end
+
+          context 'when CustomersDot is unavailable' do
+            before do
+              allow_next_instance_of(GitlabSubscriptions::FetchSubscriptionPlansService) do |instance|
+                allow(instance).to receive(:execute).and_return(nil)
+              end
+            end
+
+            it 'renders a different partial' do
+              expect(experiment(:billing_in_side_nav)).not_to track(:view, label: 'view_billing')
+
+              get :index, params: { group_id: group, from: :side_nav }
+
+              expect(response).to render_template('shared/billings/customers_dot_unavailable')
+            end
+          end
+        end
+
+        context 'when user does not come from side nav link' do
+          it 'does not track the event' do
+            expect(experiment(:billing_in_side_nav)).not_to track(:view, label: 'view_billing')
+
+            get_index
+          end
+        end
+      end
     end
 
     context 'unauthorized' do

ee/spec/helpers/billing_plans_helper_spec.rb

@@ -586,4 +586,87 @@ RSpec.describe BillingPlansHelper, :saas do
       end
     end
   end
+
+  describe '#contact_sales_button_data' do
+    let(:plan) { double('Plan', code: '_code_') }
+    let(:data) do
+      {
+        track_action: 'click_button',
+        track_label: 'contact_sales',
+        track_property: plan.code
+      }
+    end
+
+    it 'has experiment attribute' do
+      allow(helper).to receive(:params).and_return({ from: 'side_nav' })
+
+      expect(helper.contact_sales_button_data(plan)).to eq data.merge(track_experiment: :billing_in_side_nav)
+    end
+
+    it 'does not have experiment attribute' do
+      allow(helper).to receive(:params).and_return({})
+
+      expect(helper.contact_sales_button_data(plan)).to eq data
+    end
+  end
+
+  describe '#billing_upgrade_button_data' do
+    let(:plan) { double('Plan', code: '_code_') }
+    let(:data) do
+      {
+        track_action: 'click_button',
+        track_label: 'upgrade',
+        track_property: plan.code,
+        qa_selector: "upgrade_to_#{plan.code}"
+      }
+    end
+
+    it 'has experiment attribute' do
+      allow(helper).to receive(:params).and_return({ from: 'side_nav' })
+
+      expect(helper.billing_upgrade_button_data(plan)).to eq data.merge(track_experiment: :billing_in_side_nav)
+    end
+
+    it 'does not have experiment attribute' do
+      allow(helper).to receive(:params).and_return({})
+
+      expect(helper.billing_upgrade_button_data(plan)).to eq data
+    end
+  end
+
+  describe '#start_free_trial_data' do
+    let(:data) do
+      {
+        track_action: 'click_button',
+        track_label: 'start_trial',
+        qa_selector: 'start_your_free_trial'
+      }
+    end
+
+    it 'has experiment attribute' do
+      allow(helper).to receive(:params).and_return({ from: 'side_nav' })
+
+      expect(helper.start_free_trial_data).to eq data.merge(track_experiment: :billing_in_side_nav)
+    end
+
+    it 'does not have experiment attribute' do
+      allow(helper).to receive(:params).and_return({})
+
+      expect(helper.start_free_trial_data).to eq data
+    end
+  end
+
+  describe '#accessed_billing_from_side_nav?' do
+    it 'comes from billing side nav link click' do
+      allow(helper).to receive(:params).and_return({ from: 'side_nav' })
+
+      expect(helper.accessed_billing_from_side_nav?).to eq(true)
+    end
+
+    it 'does not come from side nav link click' do
+      allow(helper).to receive(:params).and_return({})
+
+      expect(helper.accessed_billing_from_side_nav?).to eq(false)
+    end
+  end
 end

ee/spec/lib/ee/sidebars/groups/menus/settings_menu_spec.rb

@@ -17,7 +17,7 @@ RSpec.describe Sidebars::Groups::Menus::SettingsMenu do
   let(:menu) { described_class.new(context) }
 
   describe 'Menu Items' do
-    subject { menu.renderable_items.find { |e| e.item_id == item_id} }
+    subject(:menu_item) { menu.renderable_items.find { |e| e.item_id == item_id} }
 
     describe 'LDAP sync menu' do
       let(:item_id) { :ldap_sync }
@@ -182,6 +182,34 @@ RSpec.describe Sidebars::Groups::Menus::SettingsMenu do
 
         specify { is_expected.to be_nil }
       end
+
+      context 'with billing_in_side_nav experiment', :experiment do
+        include Rails.application.routes.url_helpers
+
+        let(:settings_path) { group_billings_path(context.group) }
+
+        context 'with control experience' do
+          before do
+            stub_experiments(billing_in_side_nav: :control)
+          end
+
+          it 'does not modify the `active_routes` attribute' do
+            expect(menu_item.active_routes).to eq(path: 'billings#index')
+          end
+        end
+
+        context 'with candidate experience' do
+          before do
+            stub_experiments(billing_in_side_nav: :candidate)
+          end
+
+          it 'modifies the `active_routes` attribute' do
+            exclude_page = group_billings_path(context.group, from: :side_nav)
+
+            expect(menu_item.active_routes).to eq(page: settings_path, exclude_page: exclude_page)
+          end
+        end
+      end
     end
   end
 end

ee/spec/lib/ee/sidebars/groups/panel_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Sidebars::Groups::Panel do
+  let(:group) { build(:group, id: non_existing_record_id) }
+  let(:context) { Sidebars::Groups::Context.new(current_user: nil, container: group) }
+
+  subject(:panel) { described_class.new(context) }
+
+  describe 'BillingMenu' do
+    context 'with candidate experience' do
+      before do
+        stub_experiments(billing_in_side_nav: :candidate)
+      end
+
+      it 'contains the billing menu' do
+        expect(contains_billing_menu?).to be(true)
+      end
+    end
+
+    context 'with control experience' do
+      before do
+        stub_experiments(billing_in_side_nav: :control)
+      end
+
+      it 'does not contain the billing menu' do
+        expect(contains_billing_menu?).to be(false)
+      end
+    end
+
+    def contains_billing_menu?
+      contains_menu?(Sidebars::Groups::Menus::BillingMenu)
+    end
+  end
+
+  def contains_menu?(menu)
+    panel.instance_variable_get(:@menus).any? { |i| i.is_a?(menu) }
+  end
+end

ee/spec/lib/ee/sidebars/projects/panel_spec.rb

@@ -6,6 +6,8 @@ RSpec.describe Sidebars::Projects::Panel do
   let(:project) { build(:project) }
   let(:context) { Sidebars::Projects::Context.new(current_user: nil, container: project) }
 
+  subject(:panel) { described_class.new(context) }
+
   describe 'ExternalIssueTrackerMenu' do
     before do
       allow_next_instance_of(Sidebars::Projects::Menus::IssuesMenu) do |issues_menu|
@@ -13,17 +15,11 @@ RSpec.describe Sidebars::Projects::Panel do
       end
     end
 
-    subject { described_class.new(context) }
-
-    def contains_external_issue_tracker_menu
-      subject.instance_variable_get(:@menus).any? { |i| i.is_a?(Sidebars::Projects::Menus::ExternalIssueTrackerMenu) }
-    end
-
     context 'when show_jira_menu_items? is false' do
       let(:show_jira_menu_items) { false }
 
       it 'contains ExternalIssueTracker menu' do
-        expect(contains_external_issue_tracker_menu).to be(true)
+        expect(contains_external_issue_tracker_menu?).to be(true)
       end
     end
 
@@ -31,8 +27,42 @@ RSpec.describe Sidebars::Projects::Panel do
       let(:show_jira_menu_items) { true }
 
       it 'does not contain ExternalIssueTracker menu' do
-        expect(contains_external_issue_tracker_menu).to be(false)
+        expect(contains_external_issue_tracker_menu?).to be(false)
       end
     end
+
+    def contains_external_issue_tracker_menu?
+      contains_menu?(Sidebars::Projects::Menus::ExternalIssueTrackerMenu)
+    end
+  end
+
+  describe 'BillingMenu' do
+    context 'with candidate experience' do
+      before do
+        stub_experiments(billing_in_side_nav: :candidate)
+      end
+
+      it 'assigns the candidate experience and tracks the event' do
+        expect(contains_billing_menu?).to be(true)
+      end
+    end
+
+    context 'with control experience' do
+      before do
+        stub_experiments(billing_in_side_nav: :control)
+      end
+
+      it 'assigns the candidate experience and tracks the event' do
+        expect(contains_billing_menu?).to be(false)
+      end
+    end
+
+    def contains_billing_menu?
+      contains_menu?(Sidebars::Projects::Menus::BillingMenu)
+    end
+  end
+
+  def contains_menu?(menu)
+    panel.instance_variable_get(:@menus).any? { |i| i.is_a?(menu) }
   end
 end

ee/spec/lib/sidebars/groups/menus/administration_menu_spec.rb

@@ -50,7 +50,7 @@ RSpec.describe Sidebars::Groups::Menus::AdministrationMenu do
   end
 
   describe 'Menu items' do
-    subject { menu.renderable_items.index { |e| e.item_id == item_id } }
+    subject(:menu_item) { menu.renderable_items.find { |e| e.item_id == item_id } }
 
     describe 'SAML SSO menu' do
       let(:item_id) { :saml_sso }
@@ -110,6 +110,34 @@ RSpec.describe Sidebars::Groups::Menus::AdministrationMenu do
 
         specify { is_expected.to be_nil }
       end
+
+      context 'with billing_in_side_nav experiment', :experiment do
+        include Rails.application.routes.url_helpers
+
+        let(:settings_path) { group_billings_path(context.group) }
+
+        context 'with control experience' do
+          before do
+            stub_experiments(billing_in_side_nav: :control)
+          end
+
+          it 'does not modify the `active_routes` attribute' do
+            expect(menu_item.active_routes).to eq(path: 'billings#index')
+          end
+        end
+
+        context 'with candidate experience' do
+          before do
+            stub_experiments(billing_in_side_nav: :candidate)
+          end
+
+          it 'modifies the `active_routes` attribute' do
+            exclude_page = group_billings_path(context.group, from: :side_nav)
+
+            expect(menu_item.active_routes).to eq(page: settings_path, exclude_page: exclude_page)
+          end
+        end
+      end
     end
   end
 end

ee/spec/lib/sidebars/groups/menus/billing_menu_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Sidebars::Groups::Menus::BillingMenu do
+  it_behaves_like 'billing menu items' do
+    let(:context) { Sidebars::Groups::Context.new(current_user: user, container: group) }
+  end
+end

ee/spec/lib/sidebars/projects/menus/billing_menu_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Sidebars::Projects::Menus::BillingMenu do
+  it_behaves_like 'billing menu items' do
+    let(:context) do
+      container = instance_double(Project, namespace: group)
+      Sidebars::Projects::Context.new(current_user: user, container: container)
+    end
+  end
+end

ee/spec/support/shared_examples/lib/sidebars/billing_menu_shared_examples.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'billing menu items' do
+  let(:user) { instance_double(User) }
+  let(:group) { instance_double(Group) }
+  let(:namespace) { instance_double(Namespace) }
+
+  before do
+    allow(billing_menu).to receive(:can?).and_call_original
+    allow(group).to receive(:root_ancestor).and_return(namespace)
+  end
+
+  subject(:billing_menu) { described_class.new(context) }
+
+  context 'when the group can be administered' do
+    include Rails.application.routes.url_helpers
+
+    before do
+      stub_application_setting(check_namespace_plan: true)
+      allow(billing_menu).to receive(:can?).with(user, :admin_namespace, namespace).and_return(true)
+    end
+
+    describe '#title' do
+      it 'displays the correct Billing menu text for the link in the side nav' do
+        expect(billing_menu.title).to eq('Billing')
+      end
+    end
+
+    describe '#link' do
+      it 'displays the correct Billing menu text for the link in the side nav' do
+        page = group_billings_path(namespace, from: :side_nav)
+
+        expect(billing_menu.link).to eq page
+      end
+    end
+
+    describe '#active_routes' do
+      it 'uses page matching' do
+        page = group_billings_path(namespace, from: :side_nav)
+
+        expect(billing_menu.active_routes).to eq({ page: page })
+      end
+    end
+
+    describe '#extra_nav_link_html_options' do
+      it 'adds tracking attributes' do
+        data = { track_action: :render, track_experiment: :billing_in_side_nav }
+
+        expect(billing_menu.extra_nav_link_html_options).to eq({ data: data })
+      end
+    end
+
+    describe '#sprite_icon' do
+      it 'has the credit card icon' do
+        expect(billing_menu.sprite_icon).to eq 'credit-card'
+      end
+    end
+
+    describe '#extra_container_html_options' do
+      it 'has the shortcut class' do
+        expect(billing_menu.extra_container_html_options).to eq({ class: 'shortcuts-billings' })
+      end
+    end
+  end
+
+  describe '#render?' do
+    using RSpec::Parameterized::TableSyntax
+
+    before do
+      stub_application_setting(check_namespace_plan: check_namespace_plan)
+      allow(billing_menu).to receive(:can?).with(user, :admin_namespace, namespace).and_return(user_can_admin_namespace)
+      allow(namespace).to receive(:user_namespace?).and_return(user_namespace)
+    end
+
+    subject { billing_menu.render? }
+
+    where(
+      check_namespace_plan: [true, false],
+      user_can_admin_namespace: [true, false],
+      user_namespace: [true, false]
+    )
+
+    with_them do
+      it { is_expected.to eq(check_namespace_plan && user_can_admin_namespace && !user_namespace) }
+    end
+  end
+end

ee/spec/views/layouts/nav/sidebar/_group.html.haml_spec.rb

@@ -598,4 +598,28 @@ RSpec.describe 'layouts/nav/sidebar/_group' do
       expect(rendered).to have_link('Billing', href: group_billings_path(group))
     end
   end
+
+  describe 'Billing Menu' do
+    before do
+      group.add_owner(user)
+      allow(::Gitlab::CurrentSettings).to receive(:should_check_namespace_plan?).and_return(true)
+      allow(view).to receive(:current_user).and_return(user)
+    end
+
+    it 'has a link to the billing page' do
+      stub_experiments(billing_in_side_nav: :candidate)
+
+      render
+
+      expect(rendered).to have_link('Billing', href: group_billings_path(group, from: :side_nav))
+    end
+
+    it 'does not have a link to the billing page' do
+      stub_experiments(billing_in_side_nav: :control)
+
+      render
+
+      expect(rendered).not_to have_link('Billing', href: group_billings_path(group, from: :side_nav))
+    end
+  end
 end

ee/spec/views/layouts/nav/sidebar/_project.html.haml_spec.rb

@@ -4,8 +4,7 @@ require 'spec_helper'
 
 RSpec.describe 'layouts/nav/sidebar/_project' do
   let_it_be_with_refind(:project) { create(:project, :repository) }
-
-  let(:user) { project.owner }
+  let_it_be(:user) { project.owner }
 
   before do
     assign(:project, project)
@@ -390,4 +389,30 @@ RSpec.describe 'layouts/nav/sidebar/_project' do
       end
     end
   end
+
+  describe 'Billing Menu' do
+    let_it_be(:group) { create(:group).tap { |group| group.add_owner(user) } }
+
+    before do
+      allow(project).to receive(:namespace).and_return(group)
+      allow(::Gitlab::CurrentSettings).to receive(:should_check_namespace_plan?).and_return(true)
+      allow(view).to receive(:current_user).and_return(user)
+    end
+
+    it 'has a link to the billing page' do
+      stub_experiments(billing_in_side_nav: :candidate)
+
+      render
+
+      expect(rendered).to have_link('Billing', href: group_billings_path(group, from: :side_nav))
+    end
+
+    it 'does not have a link to the billing page' do
+      stub_experiments(billing_in_side_nav: :control)
+
+      render
+
+      expect(rendered).not_to have_link('Billing', href: group_billings_path(group, from: :side_nav))
+    end
+  end
 end

spec/helpers/tab_helper_spec.rb

@@ -122,11 +122,24 @@ RSpec.describe TabHelper do
       specify do
         result = helper.nav_link(controller: controller_param, action: action_param, path: path_param)
 
-        if active
-          expect(result).to match(/active/)
-        else
-          expect(result).not_to match(/active/)
-        end
+        expect(result.include?('active')).to eq(active)
+      end
+    end
+
+    where(:page, :excluded_page, :active) do
+      nil           | nil               | false
+      '_some_page_' | nil               | true
+      '_some_page_' | '_excluded_page_' | true
+      '_some_page_' | '_some_page_'     | false
+    end
+
+    with_them do
+      specify do
+        allow(helper).to receive(:route_matches_pages?).and_return(page.present?, page == excluded_page)
+
+        result = helper.nav_link(page: page, exclude_page: excluded_page)
+
+        expect(result.include?('active')).to eq(active)
       end
     end
 
@@ -149,11 +162,7 @@ RSpec.describe TabHelper do
         specify do
           result = helper.nav_link(controller: controller_param, action: action_param, path: path_param)
 
-          if active
-            expect(result).to match(/active/)
-          else
-            expect(result).not_to match(/active/)
-          end
+          expect(result.include?('active')).to eq(active)
         end
       end
     end