assertNotNull(stats.get("activeResources"));
        assertNotNull(stats.get("closedResources"));
    }

    @Test
    @DisplayName("Test get active resources")
    void testGetActiveResources() {
        TestResource resource = new TestResource("active1");
        resourceManager.registerResource(resource);

        var activeResources = resourceManager.getActiveResources();

        for (Map.Entry<String, ResourceHolder> entry : activeResources.entrySet()) {
            ResourceHolder holder = entry.getValue();

            // Check if resource is abandoned
            if (!holder.closed && !holder.isAlive()) {
                // Resource object has been garbage collected but not closed
                reportLeak(holder);
                activeResources.remove(entry.getKey());
                cleaned++;