Broken eager loading testcase

tests/Tests/ORM/Functional/Ticket/GH11149/GH11149Test.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\Tests\OrmFunctionalTestCase;
+use PHPUnit\Framework\Attributes\RequiresPhp;
+
+#[RequiresPhp('8.1')]
+class GH11149Test extends OrmFunctionalTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->setUpEntitySchema([
+            Locale::class,
+            Product::class,
+            ProductTranslation::class,
+        ]);
+    }
+
+    public function testEagerLoadAssociationIndexedByEntity(): void
+    {
+        $this->_em->persist($product = new Product(11149));
+        $this->_em->persist($locale = new Locale('fr_FR'));
+        $this->_em->persist(new ProductTranslation($product, $locale));
+
+        $this->_em->flush();
+        $this->_em->clear();
+
+        $product = $this->_em->find(Product::class, 11149);
+        static::assertInstanceOf(Product::class, $product);
+        static::assertCount(1, $product->translations);
+
+        $translation = $product->translations->get('fr_FR');
+        static::assertInstanceOf(ProductTranslation::class, $translation);
+    }
+}

tests/Tests/ORM/Functional/Ticket/GH11149/Locale.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity]
+#[ORM\Table('gh11149_locale')]
+class Locale
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'string', enumType: LocaleCode::class)]
+    public LocaleCode $code;
+
+    public function __construct(string $code)
+    {
+        $this->code = LocaleCode::from($code);
+    }
+}

tests/Tests/ORM/Functional/Ticket/GH11149/LocaleCode.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+enum LocaleCode: string
+{
+    case French = 'fr_FR';
+}

tests/Tests/ORM/Functional/Ticket/GH11149/Product.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity]
+#[ORM\Table('gh11149_product')]
+class Product
+{
+    #[ORM\Id]
+    #[ORM\Column(type: 'integer')]
+    public int $id;
+
+    #[ORM\OneToMany(
+        targetEntity: ProductTranslation::class,
+        mappedBy: 'product',
+        fetch: 'EAGER',
+        indexBy: 'locale_code',
+    )]
+    public Collection $translations;
+
+    public function __construct(int $id)
+    {
+        $this->id           = $id;
+        $this->translations = new ArrayCollection();
+    }
+}

tests/Tests/ORM/Functional/Ticket/GH11149/ProductTranslation.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket\GH11149;
+
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity]
+#[ORM\Table('gh11149_product_translation')]
+class ProductTranslation
+{
+    #[ORM\Id]
+    #[ORM\ManyToOne(targetEntity: Product::class, inversedBy: 'translations')]
+    #[ORM\JoinColumn(nullable: false)]
+    public Product $product;
+
+    #[ORM\Id]
+    #[ORM\ManyToOne(targetEntity: Locale::class)]
+    #[ORM\JoinColumn(name: 'locale_code', referencedColumnName: 'code', nullable: false)]
+    public Locale $locale;
+
+    public function __construct(Product $product, Locale $locale)
+    {
+        $this->product = $product;
+        $this->locale  = $locale;
+    }
+}