Hide push rules link if license does not allow it

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

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

-= nav_link(controller: :push_rules) do
-  = link_to admin_push_rule_path do
-    .nav-icon-container
-      = sprite_icon('push-rules')
-    %span.nav-item-name
-      = _('Push Rules')
-  %ul.sidebar-sub-level-items.is-fly-out-only
-    = nav_link(controller: :push_rules, html_options: { class: "fly-out-top-item" } ) do
-      = link_to admin_push_rule_path do
-        %strong.fly-out-top-item-name
-          = _('Push Rules')
+- if License.feature_available?(:push_rules)
+  = nav_link(controller: :push_rules) do
+    = link_to admin_push_rule_path do
+      .nav-icon-container
+        = sprite_icon('push-rules')
+      %span.nav-item-name
+        = _('Push Rules')
+    %ul.sidebar-sub-level-items.is-fly-out-only
+      = nav_link(controller: :push_rules, html_options: { class: "fly-out-top-item" } ) do
+        = link_to admin_push_rule_path do
+          %strong.fly-out-top-item-name
+            = _('Push Rules')

ee/changelogs/unreleased/12000-push-rules-shows-404-error-when-you-don-t-have-a-license-install.yml

+---
+title: Hide Push rules link when you dont have a license installed
+merge_request: 17530
+author:
+type: fixed

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

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'layouts/nav/sidebar/_push_rules_link' do
+  context 'license includes push rules feature' do
+    it 'shows the link' do
+      stub_licensed_features(push_rules: true)
+
+      render
+
+      expect(rendered).to have_link 'Push Rules'
+    end
+  end
+
+  context 'license does not include push rules feature' do
+    it 'hides the link' do
+      stub_licensed_features(push_rules: false)
+
+      render
+
+      expect(rendered).not_to have_link 'Push Rules'
+    end
+  end
+end