}
    }

    /**
     * Unregister a resource
     *
     * @param resourceId the resource ID
     */
    public void unregisterResource(String resourceId) {
        ResourceHolder holder = activeResources.remove(resourceId);
        if (holder != null) {
            if (!holder.closed) {
                holder.closed = true;

    void testResourceUnregistration() {
        TestResource resource = new TestResource("test5");
        String resourceId = resourceManager.registerResource(resource);

        resourceManager.unregisterResource(resourceId);

        // After unregistration, the resource should be removed from active tracking
        Map<String, Object> stats = resourceManager.getStatistics();
        assertNotNull(stats);
    }