Add Unit Test for Readonly Properties on PHP 8.1

lib/Doctrine/Common/Proxy/ProxyGenerator.php

@@ -1008,7 +1008,7 @@ private function isShortIdentifierGetter($method, ClassMetadata $class)
     /**
      * Generates the list of public properties to be lazy loaded, that are writable.
      *
-     * @return array<int, string>
+     * @return list<string>
      */
     public function getWriteableLazyLoadedPublicPropertiesNames(ClassMetadata $class): array
     {

tests/Doctrine/Tests/Common/Proxy/Php81ReadonlyPublicPropertyType.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Doctrine\Tests\Common\Proxy;
+
+class Php81ReadonlyPublicPropertyType
+{
+    public readonly string $readable;
+    public string $writeable = 'default';
+
+    public function __construct(
+        public readonly string $id,
+    ) {}
+}

tests/Doctrine/Tests/Common/Proxy/ProxyGeneratorTest.php

@@ -525,6 +525,41 @@ public function testPhp81NeverType()
         );
     }
 
+    /**
+     * @requires PHP >= 8.1.0
+     */
+    public function testPhp81ReadonlyPublicProperties()
+    {
+        $className = Php81ReadonlyPublicPropertyType::class;
+        $proxyClassName = 'Doctrine\Tests\Common\ProxyProxy\__CG__\Php81ReadonlyPublicPropertyType';
+
+        if ( ! class_exists($proxyClassName, false)) {
+            $metadata = $this->createClassMetadata($className, ['id']);
+
+            $metadata
+                ->expects($this->any())
+                ->method('hasField')
+                ->will($this->returnCallback(static function ($fieldName) {
+                    return in_array($fieldName, ['id', 'readable', 'writeable']);
+                }));
+
+            $proxyGenerator = new ProxyGenerator(__DIR__ . '/generated', __NAMESPACE__ . 'Proxy');
+            $this->generateAndRequire($proxyGenerator, $metadata);
+        }
+
+        // Readonly properties are removed from unset.
+        self::assertStringContainsString(
+            'unset($this->writeable);',
+            file_get_contents(__DIR__ . '/generated/__CG__DoctrineTestsCommonProxyPhp81ReadonlyPublicPropertyType.php')
+        );
+
+        // But remain in property listings.
+        self::assertStringContainsString(
+            "'readable' => NULL",
+            file_get_contents(__DIR__ . '/generated/__CG__DoctrineTestsCommonProxyPhp81ReadonlyPublicPropertyType.php')
+        );
+    }
+
     /**
      * @requires PHP >= 8.1.0
      */