code: @Test public void testHandlerAdded() throws Exception {
    ChannelHandlerContext context=mock(ChannelHandlerContext.class);
    Channel channel=mock(Channel.class);
    when(context.channel()).thenReturn(channel);
    InetAddress addr=mock(InetAddress.class);
    when(addr.isLoopbackAddress()).thenReturn(false);
    InetSocketAddress address=new InetSocketAddress(addr,12345);
    when(channel.remoteAddress()).thenReturn(address);
    ChannelFuture future=mock(ChannelFuture.class);
    when(context.writeAndFlush(any(ByteBuf.class))).thenReturn(future);
    LocalHostPermitHandler handler=new LocalHostPermitHandler(false);
    handler.handlerAdded(context);
    ArgumentCaptor<ByteBuf> captor=ArgumentCaptor.forClass(ByteBuf.class);
    verify(context).writeAndFlush(captor.capture());
    assertThat(new String(captor.getValue().array()),containsString("Foreign Ip Not Permitted"));
    verify(future).addListener(ChannelFutureListener.CLOSE);
  }
  