Add Navigation Tracking Metatags shim

app/views/govuk_component/analytics_meta_tags.raw.html.erb

@@ -81,3 +81,5 @@
 <% meta_tags.each do |name, content| %>
   <meta name="<%= name %>" content="<%= content %>">
 <% end %>
+
+<%= yield :analytics_meta_tags %>

app/views/govuk_component/analytics_meta_tags_navigation.raw.html.erb

@@ -0,0 +1,9 @@
+<%
+  number_of_sections ||= 0
+  number_of_links ||= 0
+%>
+
+<% content_for :analytics_meta_tags do %>
+  <meta name="govuk:navigation-sections" content="<%= number_of_sections %>">
+  <meta name="govuk:navigation-links" content="<%= number_of_links %>">
+<% end %>

app/views/govuk_component/docs/analytics_meta_tags_navigation.yml

@@ -0,0 +1,10 @@
+name: Analytics Meta Tags
+description: Meta tags to provide analytics information about the current page
+body: |
+  A component that appends counts for navigation elements to the analytics_meta_tags component.
+
+  The code which reads the meta tags can be found <a href="https://github.com/alphagov/static/blob/master/app/assets/javascripts/analytics/static-analytics.js#L76-L96">in static-analytics.js</a>.
+fixtures:
+  default:
+    number_of_sections: 2
+    number_of_links: 6

test/govuk_component/analytics_meta_tags_navigation_test.rb

@@ -0,0 +1,13 @@
+require 'govuk_component_test_helper'
+
+class AnalyticsMetaTagsNavigationTestCase < ComponentTestCase
+  def component_name
+    "analytics_meta_tags_navigation"
+  end
+
+  test "no error if no parameters passed in" do
+    assert_nothing_raised do
+      render_component({})
+    end
+  end
+end

test/govuk_component/analytics_meta_tags_test.rb

@@ -19,7 +19,7 @@ def example_document_for(format, example_name)
   end
 
   test "no meta tags are rendered when there's no trackable data" do
-    assert_empty render_component(content_item: {})
+    assert_empty render_component(content_item: {}).strip
   end
 
   test "renders format in a meta tag" do
@@ -85,8 +85,8 @@ def example_document_for(format, example_name)
   end
 
   test "does not render publishing government or political status when political or government is missing" do
-    assert_empty render_component(content_item: { details: { government: { current: true, slug: 'government' } } })
-    assert_empty render_component(content_item: { details: { political: true } })
+    assert_empty render_component(content_item: { details: { government: { current: true, slug: 'government' } } }).strip
+    assert_empty render_component(content_item: { details: { political: true } }).strip
   end
 
   test "renders user journey stage when user journey supertype is included" do