anchor.diff:  
   all() ->
       [
  +     send_window_update,
        send_window_update_with_zero,
        send_window_update_with_zero_on_stream,
        send_window_updates_greater_than_max,
  
positive.code:     Resp = http2c:wait_for_n_frames(Client, 0, 1),
      ct:pal("Resp: ~p", [Resp]),
      ?assertEqual(1, length(Resp)),
      [{_GoAwayH, GoAway}] = Resp,
      ?PROTOCOL_ERROR = GoAway#goaway.error_code,
      ok.
  
  send_window_update_with_zero_on_stream(_Config) ->
  
negative.code: end_per_suite(Config) ->
      chatterbox_test_buddy:stop(Config),
      ok.
  
  send_window_update(_Config) ->
      {ok, Client} = http2c:start_link(),
  
      %% Send settings initial window size = 1
      http2c:send_binary(
        Client,
        <<0,0,6,?SETTINGS,0,0,0,0,0,0,?SETTINGS_INITIAL_WINDOW_SIZE/binary,0,0,0,1>>
       ),
  
      RequestHeaders =
          [
           {<<":method">>, <<"GET">>},
           {<<":path">>, <<"/index.html">>},
           {<<":scheme">>, <<"https">>},
           {<<":authority">>, <<"localhost:8080">>},
           {<<"accept">>, <<"*/*">>},
           {<<"accept-encoding">>, <<"gzip, deflate">>},
           {<<"user-agent">>, <<"chattercli/0.0.1 :D">>}
          ],
  
      {F, _} = http2_frame_headers:to_frame(1, RequestHeaders, hpack:new_context()),
  
      http2c:send_unaltered_frames(Client, [F]),
  
      Resp0 = http2c:wait_for_n_frames(Client, 1, 1),
      ct:pal("Resp9: ~p", [Resp0]),
      ?assertEqual(1, length(Resp0)), % Should get one byte:
  
      [{Frame1H, _}] = Resp0,
      ?assertEqual(1, Frame1H#frame_header.length),
  
      http2c:send_unaltered_frames(
        Client,
        [
         {#frame_header{
             stream_id=1
            },
          #window_update{
             window_size_increment=1}}
        ]
       ),
  
      Resp1 = http2c:wait_for_n_frames(Client, 1, 1),
      ct:pal("Resp1: ~p", [Resp1]),
      ?assertEqual(1, length(Resp1)),
  
      [{Frame2H, _}] = Resp1,
      ?assertEqual(1, Frame2H#frame_header.length),
  
      ok.
  
  
  send_window_update_with_zero(_Config) ->
      {ok, Client} = http2c:start_link(),
  