diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 501a6835b..1b5eb623f 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -3,6 +3,8 @@ class ApplicationController < ActionController::Base
# For APIs, you may want to use :null_session instead.
protect_from_forgery except: :service_sign_in_options
+ include AATestable
+
private
def content_item_path
diff --git a/app/controllers/concerns/aa_testable.rb b/app/controllers/concerns/aa_testable.rb
new file mode 100644
index 000000000..032b17b92
--- /dev/null
+++ b/app/controllers/concerns/aa_testable.rb
@@ -0,0 +1,29 @@
+module AATestable
+ RELATED_LINKS_DIMENSION = 65
+
+ def self.included(base)
+ base.helper_method(
+ :related_links_variant
+ )
+ base.after_action :set_test_response_header
+ end
+
+ def related_links_variant
+ @related_links_variant ||= related_links_test.requested_variant(request.headers)
+ end
+
+private
+
+ def related_links_test
+ @related_links_test ||= GovukAbTesting::AbTest.new(
+ "RelatedLinksAATest",
+ dimension: RELATED_LINKS_DIMENSION,
+ allowed_variants: %w(A B),
+ control_variant: "A"
+ )
+ end
+
+ def set_test_response_header
+ related_links_variant.configure_response(response)
+ end
+end
diff --git a/app/views/development/index.html.erb b/app/views/development/index.html.erb
index 690948adc..6dbe43029 100644
--- a/app/views/development/index.html.erb
+++ b/app/views/development/index.html.erb
@@ -4,6 +4,7 @@
government-frontend development page
+ <%= related_links_variant.analytics_meta_tag.html_safe %>
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index 282739496..22f9fc0b2 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -21,6 +21,8 @@
<%= csrf_meta_tags %>
<%= render 'govuk_publishing_components/components/meta_tags', content_item: @content_item.content_item %>
+ <%= related_links_variant.analytics_meta_tag.html_safe %>
+
<% if @content_item.description %>
<% end %>
diff --git a/test/controllers/development_controller_test.rb b/test/controllers/development_controller_test.rb
new file mode 100644
index 000000000..5bc0164be
--- /dev/null
+++ b/test/controllers/development_controller_test.rb
@@ -0,0 +1,17 @@
+require 'test_helper'
+
+class DevelopmentControllerTest < ActionController::TestCase
+ include GovukAbTesting::MinitestHelpers
+
+ %w(A B).each do |test_variant|
+ test "RelatedLinksAATest works correctly for each variant (variant: #{test_variant})" do
+ with_variant RelatedLinksAATest: test_variant do
+ get :index
+
+ ab_test = @controller.send(:related_links_test)
+ requested = ab_test.requested_variant(request.headers)
+ assert requested.variant?(test_variant)
+ end
+ end
+ end
+end