protected ChannelPoolHandler handler() {
        return handler;
    }
@Test
    public void testHandler() {
        final ChannelPoolHandler handler = new CountingChannelPoolHandler();
        final SimpleChannelPool pool = new SimpleChannelPool(new Bootstrap(), handler);

        try {
            assertSame(handler, pool.handler());
        } finally {
            pool.close();
        }
    }