### Question:
Http2ConnectionHandler extends ByteToMessageDecoder implements Http2LifecycleManager,
                                                                            ChannelOutboundHandler { @Override public void channelInactive(ChannelHandlerContext ctx) throws Exception { super.channelInactive(ctx); if (byteDecoder != null) { byteDecoder.channelInactive(ctx); byteDecoder = null; } } protected  Http2ConnectionHandler(Http2ConnectionDecoder decoder, Http2ConnectionEncoder encoder,
                                     Http2Settings initialSettings);   Http2ConnectionHandler(boolean server, Http2FrameWriter frameWriter, Http2FrameLogger frameLogger,
                    Http2Settings initialSettings); long gracefulShutdownTimeoutMillis(); void gracefulShutdownTimeoutMillis(long gracefulShutdownTimeoutMillis); Http2Connection connection(); Http2ConnectionDecoder decoder(); Http2ConnectionEncoder encoder(); void onHttpClientUpgrade(); void onHttpServerUpgrade(Http2Settings settings); @Override void flush(ChannelHandlerContext ctx); @Override void handlerAdded(ChannelHandlerContext ctx); @Override void channelActive(ChannelHandlerContext ctx); @Override void channelInactive(ChannelHandlerContext ctx); @Override void channelWritabilityChanged(ChannelHandlerContext ctx); @Override void bind(ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise); @Override void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress,
                        ChannelPromise promise); @Override void disconnect(ChannelHandlerContext ctx, ChannelPromise promise); @Override void close(ChannelHandlerContext ctx, ChannelPromise promise); @Override void deregister(ChannelHandlerContext ctx, ChannelPromise promise); @Override void read(ChannelHandlerContext ctx); @Override void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise); @Override void channelReadComplete(ChannelHandlerContext ctx); @Override void exceptionCaught(ChannelHandlerContext ctx, Throwable cause); @Override void closeStreamLocal(Http2Stream stream, ChannelFuture future); @Override void closeStreamRemote(Http2Stream stream, ChannelFuture future); @Override void closeStream(final Http2Stream stream, ChannelFuture future); @Override void onError(ChannelHandlerContext ctx, boolean outbound, Throwable cause); @Override ChannelFuture resetStream(final ChannelHandlerContext ctx, int streamId, long errorCode,
                                     ChannelPromise promise); @Override ChannelFuture goAway(final ChannelHandlerContext ctx, final int lastStreamId, final long errorCode,
                                final ByteBuf debugData, ChannelPromise promise);  }### Answer:
@Test public void channelClosedDoesNotThrowPrefaceException() throws Exception { when(connection.isServer()).thenReturn(true); handler = newHandler(); when(channel.isActive()).thenReturn(false); handler.channelInactive(ctx); verify(frameWriter, never()).writeGoAway(any(ChannelHandlerContext.class), anyInt(), anyLong(), any(ByteBuf.class), any(ChannelPromise.class)); verify(frameWriter, never()).writeRstStream(any(ChannelHandlerContext.class), anyInt(), anyLong(), any(ChannelPromise.class)); }