Add coverage for TOS interstitial interruption flow of web app controller concern (#35235)

spec/controllers/concerns/web_app_controller_concern_spec.rb

@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe WebAppControllerConcern do
+  render_views
+
+  controller(ApplicationController) do
+    include WebAppControllerConcern # rubocop:disable RSpec/DescribedClass
+
+    def show
+      render plain: 'show'
+    end
+  end
+
+  before do
+    routes.draw { get 'show' => 'anonymous#show' }
+  end
+
+  describe 'when signed in' do
+    let(:user) { Fabricate(:user) }
+
+    before { sign_in(user) }
+
+    context 'when user does not require TOS interstitial' do
+      before { user.update(require_tos_interstitial: false) }
+
+      it 'renders requested page as expected' do
+        get :show
+
+        expect(response)
+          .to have_http_status(:success)
+        expect(response.body)
+          .to match(/show/)
+      end
+    end
+
+    context 'when user does require TOS interstitial' do
+      before { user.update(require_tos_interstitial: true) }
+
+      context 'when there is no TOS record' do
+        before { TermsOfService.destroy_all }
+
+        it 'renders requested page as expected' do
+          get :show
+
+          expect(response)
+            .to have_http_status(:success)
+          expect(response.body)
+            .to match(/show/)
+        end
+      end
+
+      context 'when there is a TOS record' do
+        before { Fabricate :terms_of_service, published_at: 1.day.ago }
+
+        it 'renders interstitial page instead of expected content' do
+          get :show
+
+          expect(response)
+            .to have_http_status(:success)
+          expect(response.body)
+            .to match(I18n.t('terms_of_service_interstitial.title', domain: local_domain_uri.host))
+        end
+      end
+    end
+  end
+end