Failing test: Duplicate private fields not detected

tests/Doctrine/Tests/ORM/Functional/Ticket/GH10450Test.php

@@ -0,0 +1,106 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\ORM\Mapping as ORM;
+use Doctrine\ORM\Mapping\MappingException;
+use Doctrine\Tests\OrmTestCase;
+use Generator;
+
+class GH10450Test extends OrmTestCase
+{
+    /**
+     * @param class-string $className
+     *
+     * @dataProvider classesThatOverrideFieldNames
+     */
+    public function testDuplicatePrivateFieldsShallBeRejected(string $className): void
+    {
+        $em = $this->getTestEntityManager();
+
+        $this->expectException(MappingException::class);
+
+        $em->getClassMetadata($className);
+    }
+
+    public function classesThatOverrideFieldNames(): Generator
+    {
+        yield 'Entity class that redeclares a private field inherited from a base entity' => [GH10450EntityChild::class];
+        yield 'Entity class that redeclares a private field inherited from a mapped superclass' => [GH10450MappedSuperclassChild::class];
+    }
+}
+
+/**
+ * @ORM\Entity
+ * @ORM\InheritanceType("JOINED")
+ * @ORM\DiscriminatorMap({ "base": "GH10450BaseEntity", "child": "GH10450EntityChild" })
+ * @ORM\DiscriminatorColumn(name="type")
+ */
+class GH10450BaseEntity
+{
+    /**
+     * @ORM\Column(type="integer")
+     * @ORM\Id
+     * @ORM\GeneratedValue
+     *
+     * @var int
+     */
+    private $id;
+
+    /**
+     * @ORM\Column(type="text", name="base")
+     *
+     * @var string
+     */
+    private $field;
+}
+
+/**
+ * @ORM\Entity
+ */
+class GH10450EntityChild extends GH10450BaseEntity
+{
+    /**
+     * @ORM\Column(type="text", name="child")
+     *
+     * @var string
+     */
+    private $field;
+}
+
+/**
+ * @ORM\MappedSuperclass
+ */
+class GH10450BaseMappedSuperclass
+{
+    /**
+     * @ORM\Column(type="integer")
+     * @ORM\Id
+     * @ORM\GeneratedValue
+     *
+     * @var int
+     */
+    private $id;
+
+    /**
+     * @ORM\Column(type="text", name="base")
+     *
+     * @var string
+     */
+    private $field;
+}
+
+/**
+ * @ORM\Entity
+ */
+class GH10450MappedSuperclassChild extends GH10450BaseMappedSuperclass
+{
+    /**
+     * @ORM\Column(type="text", name="child")
+     *
+     * @var string
+     */
+    private $field;
+}