Fix Invalid "type": "int" in openapi/json schema.

src/JsonSchema/Metadata/Property/Factory/SchemaPropertyMetadataFactory.php

@@ -244,7 +244,7 @@ private function getClassType(?string $className, bool $nullable, ?bool $readabl
         if (!$this->isResourceClass($className) && is_a($className, \BackedEnum::class, true)) {
             $enumCases = array_map(static fn (\BackedEnum $enum): string|int => $enum->value, $className::cases());
 
-            $type = \is_string($enumCases[0] ?? '') ? 'string' : 'int';
+            $type = \is_string($enumCases[0] ?? '') ? 'string' : 'integer';
 
             if ($nullable) {
                 $enumCases[] = null;

src/JsonSchema/Tests/Fixtures/DummyWithEnum.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\JsonSchema\Tests\Fixtures;
+
+use ApiPlatform\JsonSchema\Tests\Fixtures\Enum\IntEnumAsIdentifier;
+use ApiPlatform\Metadata\ApiResource;
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#[ApiResource]
+class DummyWithEnum
+{
+    public $id;
+
+    public function __construct(
+        public IntEnumAsIdentifier $intEnumAsIdentifier = IntEnumAsIdentifier::FOO,
+    ) {
+    }
+}

src/JsonSchema/Tests/Fixtures/Enum/IntEnumAsIdentifier.php

@@ -0,0 +1,20 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\JsonSchema\Tests\Fixtures\Enum;
+
+enum IntEnumAsIdentifier: int
+{
+    case FOO = 1;
+    case BAR = 2;
+}

src/JsonSchema/Tests/Metadata/Property/Factory/SchemaPropertyMetadataFactoryTest.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\JsonSchema\Tests\Metadata\Property\Factory;
+
+use ApiPlatform\JsonSchema\Metadata\Property\Factory\SchemaPropertyMetadataFactory;
+use ApiPlatform\JsonSchema\Tests\Fixtures\DummyWithEnum;
+use ApiPlatform\JsonSchema\Tests\Fixtures\Enum\IntEnumAsIdentifier;
+use ApiPlatform\Metadata\ApiProperty;
+use ApiPlatform\Metadata\Property\Factory\PropertyMetadataFactoryInterface;
+use ApiPlatform\Metadata\ResourceClassResolverInterface;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\PropertyInfo\Type;
+
+class SchemaPropertyMetadataFactoryTest extends TestCase
+{
+    public function testEnum(): void
+    {
+        $resourceClassResolver = $this->createMock(ResourceClassResolverInterface::class);
+        $apiProperty = new ApiProperty(builtinTypes: [new Type(builtinType: 'object', nullable: true, class: IntEnumAsIdentifier::class)]);
+        $decorated = $this->createMock(PropertyMetadataFactoryInterface::class);
+        $decorated->expects($this->once())->method('create')->with(DummyWithEnum::class, 'intEnumAsIdentifier')->willReturn($apiProperty);
+        $schemaPropertyMetadataFactory = new SchemaPropertyMetadataFactory($resourceClassResolver, $decorated);
+        $apiProperty = $schemaPropertyMetadataFactory->create(DummyWithEnum::class, 'intEnumAsIdentifier');
+        $this->assertEquals(['type' => ['integer', 'null'], 'enum' => [1, 2, null]], $apiProperty->getSchema());
+    }
+}