Prepare for Popular Tasks AB test

app/controllers/browse_controller.rb

@@ -1,4 +1,6 @@
 class BrowseController < ApplicationController
+  include PopularTasksAbTestable
+
   slimmer_template "gem_layout_full_width"
 
   def index

app/controllers/concerns/popular_tasks_ab_testable.rb

@@ -0,0 +1,53 @@
+module PopularTasksAbTestable
+  extend ActiveSupport::Concern
+
+  ALLOWED_VARIANTS = %w[A B C Z].freeze
+
+  included do
+    helper_method(
+      :popular_tasks_variant,
+      :popular_tasks_page_under_test?,
+      :popular_tasks_variant_a_page?,
+      :popular_tasks_variant_b_page?,
+      :popular_tasks_variant_c_page?,
+      :popular_tasks_variant_z_page?,
+    )
+    after_action :set_popular_tasks_ab_test_response_header
+  end
+
+  def popular_tasks_ab_test
+    @popular_tasks_ab_test ||= GovukAbTesting::AbTest.new(
+      "PopularTasks",
+      allowed_variants: ALLOWED_VARIANTS,
+      control_variant: "C",
+    )
+  end
+
+  def popular_tasks_variant
+    @popular_tasks_variant ||= popular_tasks_ab_test.requested_variant(request.headers)
+  end
+
+  def popular_tasks_page_under_test?
+    request.path.starts_with?(%r{/browse/business|/browse/benefits})
+  end
+
+  def set_popular_tasks_ab_test_response_header
+    popular_tasks_variant.configure_response(response) if popular_tasks_page_under_test?
+  end
+
+  def popular_tasks_variant_a_page?
+    popular_tasks_page_under_test? && popular_tasks_variant.variant?("A")
+  end
+
+  def popular_tasks_variant_b_page?
+    popular_tasks_page_under_test? && popular_tasks_variant.variant?("B")
+  end
+
+  def popular_tasks_variant_c_page?
+    popular_tasks_page_under_test? && popular_tasks_variant.variant?("C")
+  end
+
+  def popular_tasks_variant_z_page?
+    popular_tasks_page_under_test? && popular_tasks_variant.variant?("Z")
+  end
+end

app/helpers/browse_helper.rb

@@ -3,8 +3,44 @@ def display_popular_links_for_slug?(slug)
     I18n.exists?(slug.to_s, scope: "browse.popular_links")
   end
 
+  def variant_a_popular_links(slug)
+    I18n.t(slug.to_s, scope: "browse.popular_links")
+  end
+
+  def variant_b_popular_links(slug)
+    I18n.t(slug.to_s, scope: "browse.popular_links")
+  end
+
+  def variant_c_popular_links(slug)
+    I18n.t(slug.to_s, scope: "browse.popular_links")
+  end
+
+  def variant_z_popular_links(slug)
+    I18n.t(slug.to_s, scope: "browse.popular_links")
+  end
+
+  def no_popular_tasks_ab_test?
+    !respond_to?(:popular_tasks_variant)
+  end
+
+  def variant_popular_links_for_slug(slug)
+    default_variant_popular_links = variant_c_popular_links(slug)
+
+    if no_popular_tasks_ab_test?
+      default_variant_popular_links
+    elsif popular_tasks_variant_a_page?
+      variant_a_popular_links(slug)
+    elsif popular_tasks_variant_b_page?
+      variant_b_popular_links(slug)
+    elsif popular_tasks_variant_z_page?
+      variant_z_popular_links(slug)
+    else
+      default_variant_popular_links
+    end
+  end
+
   def popular_links_for_slug(slug)
-    links = I18n.t(slug.to_s, scope: "browse.popular_links")
+    links = variant_popular_links_for_slug(slug)
     count = links.length
     links.map.with_index(1) do |link, index|
       {

app/views/browse/show.html.erb

@@ -12,6 +12,7 @@
       section: page.title.downcase,
     }
   } %>
+  <%= popular_tasks_variant.analytics_meta_tag.html_safe if popular_tasks_page_under_test? %>
 <% end %>
 
 <% content_for :breadcrumbs do %>

config/locales/ar/browse.yml

@@ -12,6 +12,50 @@ ar:
           url:
         - title:
           url:
+    popular_links_a:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_b:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_c:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_z:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
     all_categories: جميع الفئات
     description:
     popular_tasks:

config/locales/az/browse.yml

@@ -12,6 +12,50 @@ az:
           url:
         - title:
           url:
+    popular_links_a:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_b:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_c:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_z:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
     all_categories: Bütün kateqoriyalar
     description:
     popular_tasks:

config/locales/be/browse.yml

@@ -12,6 +12,50 @@ be:
           url:
         - title:
           url:
+    popular_links_a:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_b:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_c:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_z:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
     all_categories: Усе катэгорыі
     description:
     popular_tasks:

config/locales/bg/browse.yml

@@ -12,6 +12,50 @@ bg:
           url:
         - title:
           url:
+    popular_links_a:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_b:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_c:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_z:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
     all_categories: Всички категории
     description:
     popular_tasks:

config/locales/bn/browse.yml

@@ -12,6 +12,50 @@ bn:
           url:
         - title:
           url:
+    popular_links_a:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_b:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_c:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
+    popular_links_z:
+      benefits:
+        - title:
+          url:
+      business:
+        - title:
+          url:
+        - title:
+          url:
+        - title:
+          url:
     all_categories: সকল শ্রেণিবিভাগ
     description:
     popular_tasks: