Fix TestCaseSourceLocatorFactory

Author: ondrejmirtes

src/Testing/TestCaseSourceLocatorFactory.php

@@ -57,7 +57,11 @@ public function create(): SourceLocator
 			$this->excludePaths,
 		]));
 		if ($classLoaderReflection->hasProperty('vendorDir') && ! isset(self::$composerSourceLocatorsCache[$cacheKey])) {
-			$composerLocators = [];
+			$composerLocators = [
+				PHP_VERSION_ID < 80500
+					? __DIR__ . '/../../stubs/runtime/Attribute84.php'
+					: __DIR__ . '/../../stubs/runtime/Attribute85.php',
+			];
 			$vendorDirProperty = $classLoaderReflection->getProperty('vendorDir');
 			$vendorDirProperty->setAccessible(true);
 			foreach ($classLoaders as $classLoader) {