DEV: Trigger DiscourseEvent on push notification send (#25375)

app/services/push_notification_pusher.rb

@@ -161,6 +161,8 @@ class PushNotificationPusher
       if subscription.first_error_at || subscription.error_count != 0
         subscription.update_columns(error_count: 0, first_error_at: nil)
       end
+
+      DiscourseEvent.trigger(:push_notification_sent, user, message)
     rescue WebPush::ExpiredSubscription
       subscription.destroy!
     rescue WebPush::ResponseError => e

spec/services/push_notification_pusher_spec.rb

@@ -15,6 +15,7 @@ RSpec.describe PushNotificationPusher do
   context "with user" do
     fab!(:user)
     let(:topic_title) { "Topic" }
+    let(:post_url) { "https://example.com/t/1/2" }
     let(:username) { "system" }
 
     def create_subscription
@@ -38,7 +39,7 @@ RSpec.describe PushNotificationPusher do
           username: username,
           excerpt: "description",
           topic_id: 1,
-          post_url: "https://example.com/t/1/2",
+          post_url: post_url,
           notification_type: notification_type,
           post_number: post_number,
         },
@@ -74,6 +75,16 @@ RSpec.describe PushNotificationPusher do
       execute_push
     end
 
+    it "triggers a DiscourseEvent with user and message arguments" do
+      WebPush.expects(:payload_send)
+      create_subscription
+      pn_sent_event = DiscourseEvent.track_events { message = execute_push }.first
+
+      expect(pn_sent_event[:event_name]).to eq(:push_notification_sent)
+      expect(pn_sent_event[:params].first).to eq(user)
+      expect(pn_sent_event[:params].second[:url]).to eq(post_url)
+    end
+
     it "deletes subscriptions which are erroring regularly" do
       start = freeze_time