assertNotSame(createdComponents.get(i), createdComponents.get(j));
            }
        }
    }

    /**
     * Test concurrent destroy operations
     */
    public void test_concurrentDestroy() throws Exception {
        final AtomicInteger destroyCount = new AtomicInteger(0);

        factory.setOnDestroyListener(new OnDestroyListener<TestComponent>() {
            @Override