Add notification policies and notification requests (#29366)

spec/models/notification_policy_spec.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe NotificationPolicy do
+  describe '#summarize!' do
+    subject { Fabricate(:notification_policy) }
+
+    let(:sender) { Fabricate(:account) }
+
+    before do
+      Fabricate.times(2, :notification, account: subject.account, activity: Fabricate(:status, account: sender))
+      Fabricate(:notification_request, account: subject.account, from_account: sender)
+      subject.summarize!
+    end
+
+    it 'sets pending_requests_count' do
+      expect(subject.pending_requests_count).to eq 1
+    end
+
+    it 'sets pending_notifications_count' do
+      expect(subject.pending_notifications_count).to eq 2
+    end
+  end
+end