Add a test to check proxy initialization

tests/Doctrine/ODM/MongoDB/Tests/Functional/Ticket/GH2349Test.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\ODM\MongoDB\Tests\Functional\Ticket;
+
+use Doctrine\ODM\MongoDB\Tests\BaseTest;
+use Documents74\GH2349Customer;
+use Documents74\GH2349Order;
+
+/**
+ * @requires PHP 7.4
+ */
+class GH2349Test extends BaseTest
+{
+    /**
+     * @doesNotPerformAssertions
+     */
+    public function testAccessingUnitializedProperties(): void
+    {
+        $customer = new GH2349Customer('Some Place');
+        $order    = new GH2349Order($customer);
+
+        $this->dm->persist($customer);
+        $this->dm->persist($order);
+        $this->dm->flush();
+        $this->dm->clear();
+
+        $orderId = GH2349Order::ID;
+
+        $order = $this->dm->getRepository(GH2349Order::class)->find($orderId);
+
+        // Fetch a list of Customers from the DB. Any customer object that was referenced in the above order is still
+        // a proxy object, however it will not have the defaults set for the un-managed $domainEvents property.
+        $customers = $this->dm->getRepository(GH2349Customer::class)->findAll();
+
+        foreach ($customers as $customer) {
+            $customer->doSomeUpdate(); // This will trigger an error as we try to append to the non-existing $domainEvents property
+        }
+    }
+}

tests/Documents74/GH2349Customer.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Documents74;
+
+use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
+
+/**
+ * @ODM\Document()
+ */
+class GH2349Customer
+{
+    public const ID = '610419a277d50f7609139542';
+
+    /** @ODM\Id() */
+    private string $id;
+
+    /** @ODM\Field() */
+    private string $name;
+
+    private array $domainEvents = [];
+
+    public function __construct(string $name)
+    {
+        $this->id   = self::ID;
+        $this->name = $name;
+    }
+
+    public function doSomeUpdate(): void
+    {
+        $this->domainEvents[] = 'a new event!';
+    }
+
+    public function getEvents(): array
+    {
+        return $this->domainEvents;
+    }
+}

tests/Documents74/GH2349Order.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Documents74;
+
+use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
+use MongoDB\BSON\ObjectId;
+
+/**
+ * @ODM\Document()
+ */
+class GH2349Order
+{
+    public const ID = '610419a277d50f7609139543';
+
+    /** @ODM\Id() */
+    private string $id;
+
+    /** @ODM\ReferenceOne(targetDocument=GH2349Customer::class, storeAs="ref") */
+    private GH2349Customer $customer;
+
+    public function __construct(GH2349Customer $customer)
+    {
+        $this->id       = (string) new ObjectId(self::ID);
+        $this->customer = $customer;
+    }
+}