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MemcachedSessionHandler example

$options = ($query ?: []) + $options;

        switch (true) {
            case $connection instanceof \Redis:
            case $connection instanceof Relay:
            case $connection instanceof \RedisArray:
            case $connection instanceof \RedisCluster:
            case $connection instanceof \Predis\ClientInterface:
                return new RedisSessionHandler($connection);

            case $connection instanceof \Memcached:
                return new MemcachedSessionHandler($connection);

            case $connection instanceof \PDO:
                return new PdoSessionHandler($connection);

            case !\is_string($connection):
                throw new \InvalidArgumentException(sprintf('Unsupported Connection: "%s".', get_debug_type($connection)));
            case str_starts_with($connection, 'file://'):
                $savePath = substr($connection, 7);

                return new StrictSessionHandler(new NativeFileSessionHandler('' === $savePath ? null : $savePath));

        $r = new \ReflectionClass(\Memcached::class);
        $methodsToMock = array_map(fn ($m) => $m->name, $r->getMethods(\ReflectionMethod::IS_PUBLIC));
        $methodsToMock = array_diff($methodsToMock, ['getDelayed', 'getDelayedByKey']);

        $this->memcached = $this->getMockBuilder(\Memcached::class)
            ->disableOriginalConstructor()
            ->onlyMethods($methodsToMock)
            ->getMock();

        $this->storage = new MemcachedSessionHandler(
            $this->memcached,
            ['prefix' => self::PREFIX, 'expiretime' => self::TTL]
        );
    }

    public function testOpenSession()
    {
        $this->assertTrue($this->storage->open('', ''));
    }

    public function testCloseSession()
    {