### Question:
Http2ConnectionHandler extends ByteToMessageDecoder implements Http2LifecycleManager, ChannelOutboundHandler { @Override public void channelInactive(final ChannelHandlerContext ctx) throws Exception { super.channelInactive(ctx); if (byteDecoder != null) { byteDecoder.channelInactive(ctx); byteDecoder = null; } } protected  Http2ConnectionHandler(
      final Http2ConnectionDecoder decoder,
      final Http2ConnectionEncoder encoder,
      final Http2Settings initialSettings); protected  Http2ConnectionHandler(
      final Http2ConnectionDecoder decoder,
      final Http2ConnectionEncoder encoder,
      final Http2Settings initialSettings,
      final boolean decoupleCloseAndGoAway); long gracefulShutdownTimeoutMillis(); void gracefulShutdownTimeoutMillis(final long gracefulShutdownTimeoutMillis); Http2Connection connection(); Http2ConnectionDecoder decoder(); Http2ConnectionEncoder encoder(); void onHttpClientUpgrade(); void onHttpServerUpgrade(final Http2Settings settings); @Override void flush(final ChannelHandlerContext ctx); @Override void handlerAdded(final ChannelHandlerContext ctx); @Override void channelActive(final ChannelHandlerContext ctx); @Override void channelInactive(final ChannelHandlerContext ctx); @Override void channelWritabilityChanged(final ChannelHandlerContext ctx); @Override void bind(
      final ChannelHandlerContext ctx,
      final SocketAddress localAddress,
      final ChannelPromise promise); @Override void connect(
      final ChannelHandlerContext ctx,
      final SocketAddress remoteAddress,
      final SocketAddress localAddress,
      final ChannelPromise promise); @Override void disconnect(final ChannelHandlerContext ctx, final ChannelPromise promise); @Override void close(
      final ChannelHandlerContext ctx,
      @SuppressWarnings("checkstyle:finalparameters") ChannelPromise promise); @Override void deregister(final ChannelHandlerContext ctx, final ChannelPromise promise); @Override void read(final ChannelHandlerContext ctx); @Override void write(final ChannelHandlerContext ctx, final Object msg, final ChannelPromise promise); @Override void channelReadComplete(final ChannelHandlerContext ctx); @Override void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause); @Override void closeStreamLocal(final Http2Stream stream, final ChannelFuture future); @Override void closeStreamRemote(final Http2Stream stream, final ChannelFuture future); @Override void closeStream(final Http2Stream stream, final ChannelFuture future); @Override void onError(
      final ChannelHandlerContext ctx, final boolean outbound, final Throwable cause); @Override ChannelFuture resetStream(
      final ChannelHandlerContext ctx,
      final int streamId,
      final long errorCode,
      final 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)); }