test(alert): drain notifications before teardown

internal/alert/rules.go

@@ -60,7 +60,7 @@ func (e *Engine) raiseAndNotify(ctx context.Context, hostID, kind, dedupKey, sev
 	if err == nil {
 		hostName = host.Name
 	}
-	go e.hub.Dispatch(ctx, notification.Payload{
+	e.dispatchNotification(ctx, notification.Payload{
 		Event:    notification.EventRaised,
 		AlertID:  id,
 		Severity: severity,
@@ -85,7 +85,7 @@ func (e *Engine) Acknowledge(ctx context.Context, alertID, userID string, when t
 		return nil //nolint:nilerr
 	}
 	p := alertPayload(ctx, e.store, notification.EventAcknowledged, a)
-	go e.hub.Dispatch(context.WithoutCancel(ctx), p)
+	e.dispatchNotification(context.WithoutCancel(ctx), p)
 	return nil
 }
 
@@ -99,7 +99,7 @@ func (e *Engine) Resolve(ctx context.Context, alertID string, when time.Time) er
 		return nil
 	}
 	p := alertPayload(ctx, e.store, notification.EventResolved, a)
-	go e.hub.Dispatch(context.WithoutCancel(ctx), p)
+	e.dispatchNotification(context.WithoutCancel(ctx), p)
 	return nil
 }
 
@@ -164,7 +164,7 @@ func (e *Engine) resolveAndNotify(ctx context.Context, hostID, kind, dedupKey st
 		if a.Kind != kind || a.DedupKey != dedupKey {
 			continue
 		}
-		go e.hub.Dispatch(ctx, notification.Payload{
+		e.dispatchNotification(ctx, notification.Payload{
 			Event:    notification.EventResolved,
 			AlertID:  a.ID,
 			Severity: a.Severity,