Create new Design System layout

Create design_system.html.erb layout. Make the ReportsController use the
new layout. Create a helper to build the navigation link structure for
the navbar. Write tests for the NavigationItems helper.

app/controllers/reports_controller.rb

@@ -1,4 +1,6 @@
 class ReportsController < ApplicationController
+  layout "design_system"
+
   include ActionView::Helpers::TagHelper
 
   before_action :authenticate_user!

app/helpers/navigation_items_helper.rb

@@ -0,0 +1,16 @@
+module NavigationItemsHelper
+  def navigation_items(is_editor)
+    list = [
+      { text: "Publications", href: root_path },
+    ]
+
+    if is_editor
+      list << { text: "Add artefact", href: new_artefact_path }
+      list << { text: "Downtime", href: downtimes_path }
+    end
+
+    list << { text: "Reports", href: reports_path }
+    list << { text: "Search by user", href: user_search_path }
+    list << { text: "Sign out", href: "/auth/gds/sign_out" }
+  end
+end

app/views/layouts/design_system.html.erb

@@ -0,0 +1,43 @@
+<% environment = GovukPublishingComponents::AppHelpers::Environment.current_acceptance_environment %>
+
+<%= render "govuk_publishing_components/components/layout_for_admin", product_title: "Publisher", browser_title: yield(:page_title), environment: environment  do %>
+
+  <% render "layouts/google_tag_manager" %>
+
+  <%= render "govuk_publishing_components/components/skip_link" %>
+
+  <% user = current_user %>
+
+  <%= render "govuk_publishing_components/components/layout_header", {
+    product_name: "Publisher",
+    environment: environment,
+    navigation_items: navigation_items(current_user.govuk_editor?)
+  } %>  
+
+  <div class="govuk-width-container">
+    <% [:success, :info, :warning, :danger, :notice, :alert].select { |k| flash[k].present? }.each do |k| %>
+      <%
+        case k
+        when :notice
+          alert_class = "success"
+        when :alert
+          alert_class = "danger"
+        else
+          alert_class = k
+        end
+      %>
+      <div class="alert alert-<%= alert_class %>"
+        data-module="auto-track-event"
+        data-track-action="alert-<%= alert_class %>"
+        data-track-label="<%= strip_tags(flash[k]) %>">
+          <%= flash[k] %>
+      </div>
+    <% end %>
+    
+    <%= yield %>
+  </div>
+
+  <%= render "govuk_publishing_components/components/layout_footer", {
+    navigation: [],
+  } %>  
+<% end %>

test/unit/helpers/naviation_items_helper_test.rb

@@ -0,0 +1,25 @@
+require "test_helper"
+
+class NavigationItemsHelperTest < ActionView::TestCase
+  context "NavigationItemsHelper" do
+    should "include editor only links when user is an editor" do
+      assert_equal [
+        { text: "Publications", href: root_path },
+        { text: "Add artefact", href: new_artefact_path },
+        { text: "Downtime", href: downtimes_path },
+        { text: "Reports", href: reports_path },
+        { text: "Search by user", href: user_search_path },
+        { text: "Sign out", href: "/auth/gds/sign_out" },
+      ], navigation_items(true)
+    end
+
+    should "include not include editor only links when user is not an editor" do
+      assert_equal [
+        { text: "Publications", href: root_path },
+        { text: "Reports", href: reports_path },
+        { text: "Search by user", href: user_search_path },
+        { text: "Sign out", href: "/auth/gds/sign_out" },
+      ], navigation_items(false)
+    end
+  end
+end