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

spec/models/notification_request_spec.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe NotificationRequest do
+  describe '#reconsider_existence!' do
+    subject { Fabricate(:notification_request, dismissed: dismissed) }
+
+    let(:dismissed) { false }
+
+    context 'when there are remaining notifications' do
+      before do
+        Fabricate(:notification, account: subject.account, activity: Fabricate(:status, account: subject.from_account))
+        subject.reconsider_existence!
+      end
+
+      it 'leaves request intact' do
+        expect(subject.destroyed?).to be false
+      end
+
+      it 'updates notifications_count' do
+        expect(subject.notifications_count).to eq 1
+      end
+    end
+
+    context 'when there are no notifications' do
+      before do
+        subject.reconsider_existence!
+      end
+
+      context 'when dismissed' do
+        let(:dismissed) { true }
+
+        it 'leaves request intact' do
+          expect(subject.destroyed?).to be false
+        end
+      end
+
+      it 'removes the request' do
+        expect(subject.destroyed?).to be true
+      end
+    end
+  end
+end