@Override
    public void close() {
        nameResolver.close();
    }
@Test
    public void testCloseDelegates() {
        @SuppressWarnings("unchecked")
        NameResolver<InetAddress> nameResolver = mock(NameResolver.class);
        InetSocketAddressResolver resolver = new InetSocketAddressResolver(
                ImmediateEventExecutor.INSTANCE, nameResolver);
        resolver.close();
        verify(nameResolver, times(1)).close();
    }