Add tests

types/Database/Eloquent/DatabaseNotificationCollection.php

@@ -0,0 +1,30 @@
+<?php
+
+use function PHPStan\Testing\assertType;
+use Illuminate\Notifications\DatabaseNotification;
+use Illuminate\Notifications\DatabaseNotificationCollection;
+
+class CustomNotification extends DatabaseNotification
+{
+    /**
+     * @param array<int, CustomNotification> $models
+     */
+    public function newCollection(array $models = []): CustomNotificationCollection
+    {
+        return new CustomNotificationCollection($models);
+    }
+}
+
+/**
+ * @extends DatabaseNotificationCollection<int, CustomNotification>
+ */
+class CustomNotificationCollection extends DatabaseNotificationCollection
+{
+}
+
+$databaseNotificationsCollection = DatabaseNotification::all();
+assertType('Illuminate\Database\Eloquent\Collection<int, Illuminate\Notifications\DatabaseNotification>', $databaseNotificationsCollection);
+
+
+$customNotificationsCollection = CustomNotification::all();
+assertType('Illuminate\Database\Eloquent\Collection<int, CustomNotification>', $customNotificationsCollection);