add test to demonstrate doctrine#6499 persistence ordering bug on non…

…-nullable cascading relationship

tests/Doctrine/Tests/ORM/Functional/Ticket/DDC6499Test.php

@@ -0,0 +1,81 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+/**
+ * @group DDC-6499
+ */
+class DDC6499Test extends OrmFunctionalTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->_schemaTool->createSchema(
+            [
+                $this->_em->getClassMetadata(DDC6499A::class),
+                $this->_em->getClassMetadata(DDC6499B::class),
+            ]
+        );
+    }
+
+    protected function tearDown(): void
+    {
+        parent::tearDown();
+
+        $this->_schemaTool->dropSchema(
+            [
+                $this->_em->getClassMetadata(DDC6499A::class),
+                $this->_em->getClassMetadata(DDC6499B::class),
+            ]
+        );
+    }
+
+    /**
+     * Test for the bug described in issue #6499.
+     */
+    public function testIssue(): void
+    {
+        $a = new DDC6499A();
+
+        $this->_em->flush();
+        $this->_em->clear();
+
+        self::assertEquals($this->_em->find(DDC6499A::class, $a->id)->b->id, $a->b->id, 'Issue #6499 will result in a Integrity constraint violation before reaching this point.');
+    }
+}
+
+/** @Entity */
+class DDC6499A
+{
+    /**
+     * @Id
+     * @Column(type="integer")
+     * @GeneratedValue
+     */
+    public $id;
+
+    /**
+     * @OneToOne(targetEntity="DDC6499B", cascade={"persist"})
+     * @JoinColumn(nullable=false)
+     */
+    public $b;
+
+    public function __construct()
+    {
+        $this->b = new DDC6499B();
+    }
+}
+
+/** @Entity */
+class DDC6499B
+{
+    /**
+     * @Id
+     * @Column(type="integer")
+     * @GeneratedValue
+     */
+    public $id;
+}