Implement exclusive checkboxes

app/views/form/_checkbox_question.html.erb

@@ -4,14 +4,17 @@
     caption: caption(caption_text, page_header, conditional),
     legend: legend(question, page_header, conditional),
     hint: { text: question.hint_text&.html_safe } do %>
+    <% after_divider = false %>
 
     <% question.answer_options.map do |key, val| %>
       <% if key.starts_with?("divider") %>
-        <%= f.govuk_check_box_divider %>
+      <% after_divider = true %>
+      <%= f.govuk_check_box_divider %>
       <% else %>
         <%= f.govuk_check_box question.id, key,
           label: { text: val },
           checked: @case_log[key] == "Yes",
+          exclusive: after_divider,
           **stimulus_html_attributes(question)
         %>
       <% end %>

spec/features/form/checkboxes_spec.rb

@@ -0,0 +1,41 @@
+require "rails_helper"
+require_relative "helpers"
+require_relative "../../request_helper"
+
+RSpec.describe "Checkboxes" do
+  include Helpers
+  let(:user) { FactoryBot.create(:user) }
+  let(:case_log) do
+    FactoryBot.create(
+      :case_log,
+      :in_progress,
+      owning_organisation: user.organisation,
+      managing_organisation: user.organisation,
+    )
+  end
+  let(:id) { case_log.id }
+
+  before do
+    RequestHelper.stub_http_requests
+    sign_in user
+  end
+
+  context "when exclusive checkbox is selected", js: true do
+    it "deselects all other checkboxes" do
+      visit("/logs/#{id}/accessibility-requirements")
+      page.check("case-log-accessibility-requirements-housingneeds-a-field", allow_label_click: true)
+      click_button("Save and continue")
+
+      case_log.reload
+      expect(case_log["housingneeds_a"]).to eq("Yes")
+
+      visit("/logs/#{id}/accessibility-requirements")
+      page.check("case-log-accessibility-requirements-housingneeds-h-field", allow_label_click: true)
+      click_button("Save and continue")
+
+      case_log.reload
+      expect(case_log["housingneeds_a"]).to eq("No")
+      expect(case_log["housingneeds_h"]).to eq("Yes")
+    end
+  end
+end