tests[ORMSetupTest]: testCacheNamespaceShouldBeGeneratedForApcu requires enabled apc

[kaznovac]

fix test flakiness

the apcu extension is required but if not enabled (e.g. apc.enable_cli default is 0 https://www.php.net/manual/en/apcu.configuration.php) the ORMSetup utility will choose other Cache adapters (see

orm/lib/Doctrine/ORM/ORMSetup.php

Lines 180 to 218 in 9f555ea

	private static function createCacheInstance(
	bool $isDevMode,
	string $proxyDir,
	?CacheItemPoolInterface $cache
	): CacheItemPoolInterface {
	if ($cache !== null) {
	return $cache;
	}
	if (! class_exists(ArrayAdapter::class)) {
	throw new RuntimeException(
	'The Doctrine setup tool cannot configure caches without symfony/cache.'
	. ' Please add symfony/cache as explicit dependency or pass your own cache implementation.'
	);
	}
	if ($isDevMode) {
	return new ArrayAdapter();
	}
	$namespace = 'dc2_' . md5($proxyDir);
	if (extension_loaded('apcu') && apcu_enabled()) {
	return new ApcuAdapter($namespace);
	}
	if (MemcachedAdapter::isSupported()) {
	return new MemcachedAdapter(MemcachedAdapter::createConnection('memcached://127.0.0.1'), $namespace);
	}
	if (extension_loaded('redis')) {
	$redis = new Redis();
	$redis->connect('127.0.0.1');
	return new RedisAdapter($redis, $namespace);
	}
	return new ArrayAdapter();
	}

)