Create browse list partial for variant B users

Co-authored-by: Martin Jones <martin.jones@digital.cabinet-office.gov.uk>

app/controllers/browse_controller.rb

@@ -1,4 +1,5 @@
 class BrowseController < ApplicationController
+  include NewBrowseAbTestable
   slimmer_template "gem_layout_full_width"
 
   def index
@@ -20,6 +21,8 @@ def show
 
 private
 
+  helper_method :new_browse_variant_b?
+
   def show_html(page)
     template = :show
     render template, locals: { page: }

app/views/browse/_browse_list.html.erb

@@ -0,0 +1,28 @@
+<% total_links = page.second_level_browse_pages.count.to_s %>
+<ul class="browse__chevron-cards">
+  <% page.second_level_browse_pages.map.with_index do |second_level_browse_page, index| %>
+    <%= render partial: "browse/chevron_card", locals: {
+      title: second_level_browse_page.title,
+      link: second_level_browse_page.base_path,
+      description: second_level_browse_page.description,
+      sub_heading_level: display_action_links_for_slug?(page.slug) ? 3 : 2,
+      data_attributes: {
+        track_category: "browseClicked",
+        track_action: "topicsLink",
+        track_label: second_level_browse_page.base_path,
+        track_dimension: second_level_browse_page.title,
+        track_options: {
+          dimension28: total_links,
+          dimension29: second_level_browse_page.title,
+          dimension114: index + 1,
+        },
+        ga4_link: {
+          event_name: "navigation",
+          type: "browse card",
+          index_link: index + 1,
+          index_total: total_links,
+        },
+      },
+    } %>
+  <% end %>
+</ul>

app/views/browse/show.html.erb

@@ -61,5 +61,9 @@
 <% end %>
 
 <%= render "shared/browse_cards_container" do %>
-  <%= render partial: "browse/browse_grid", locals: { page: page } %>
+  <% if new_browse_variant_b? %>
+    <%= render partial: "browse/browse_list", locals: { page: page } %>
+  <% else %>
+    <%= render partial: "browse/browse_grid", locals: { page: page } %>
+  <% end %>
 <% end %>

spec/controllers/browse_controller_spec.rb

@@ -50,13 +50,24 @@
       context "NewBrowse AB test" do
         subject { get :show, params: { top_level_slug: "benefits" } }
 
-        %w[A B Z].each do |variant|
-          it "with variant #{variant}" do
-            with_variant NewBrowse: variant do
-              expect(subject).to render_template(:show)
-            end
+        it "with variant A" do
+          with_variant NewBrowse: "A" do
+            expect(subject).to render_template(partial: "_browse_grid")
           end
         end
+
+        it "with variant B" do
+          with_variant NewBrowse: "B" do
+            expect(subject).to render_template(partial: "_browse_list")
+          end
+        end
+
+        it "with variant Z" do
+          with_variant NewBrowse: "Z" do
+            expect(subject).to render_template(partial: "_browse_grid")
+          end
+        end
+
       end
     end