Chore: FCM Notification Improvements (#957)

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

spec/models/notification_spec.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Notification do
+  context 'with associations' do
+    it { is_expected.to belong_to(:account) }
+    it { is_expected.to belong_to(:user) }
+  end
+
+  context 'with default order by' do
+    it 'sort by primary id desc' do
+      notification1 = create(:notification)
+      create(:notification)
+      notification3 = create(:notification)
+
+      expect(described_class.all.first).to eq notification3
+      expect(described_class.all.last).to eq notification1
+    end
+  end
+end