EarlyExpirationHandler example

        };

        $container = new Container();
        $container->set('computation_service', $computationService);
        $container->set('cache_pool', $pool);

        $reverseContainer = new ReverseContainer($container, new ServiceLocator([]));

        $msg = EarlyExpirationMessage::create($reverseContainer, $computationService, $item, $pool);

        $handler = new EarlyExpirationHandler($reverseContainer);

        $handler($msg);

        $this->assertSame(123, $pool->get('foo', $this->fail(...), 0.0, $metadata));

        $this->assertGreaterThan(25, $metadata['ctime']);
        $this->assertGreaterThan(time(), $metadata['expiry']);
    }
}