writer.frameHeader(0, 16777216, Http2.TYPE_DATA, FLAG_NONE)
    }.also { expected ->
      // TODO: real max is based on settings between 16384 and 16777215
      assertThat(expected.message).isEqualTo("FRAME_SIZE_ERROR length > 16384: 16777216")
    }
  }

  @Test fun ackSettingsAppliesMaxFrameSize() {
    val newMaxFrameSize = 16777215
    val writer = Http2Writer(Buffer(), true)

    assertThat(settings.getMaxFrameSize(16384)).isEqualTo(16384)
    settings[Settings.MAX_FRAME_SIZE] = 16777215
    assertThat(settings.getMaxFrameSize(16384)).isEqualTo(16777215)
    assertThat(settings.getMaxHeaderListSize(-1)).isEqualTo(-1)
    settings[Settings.MAX_HEADER_LIST_SIZE] = 16777215
    assertThat(settings.getMaxHeaderListSize(-1)).isEqualTo(16777215)
    assertThat(settings.initialWindowSize).isEqualTo(
      Settings.DEFAULT_INITIAL_WINDOW_SIZE,

          }
        }

        // SETTINGS_MAX_FRAME_SIZE
        5 -> {
          if (value < INITIAL_MAX_FRAME_SIZE || value > 16777215) {
            throw IOException("PROTOCOL_ERROR SETTINGS_MAX_FRAME_SIZE: $value")
          }
        }

        // SETTINGS_MAX_HEADER_LIST_SIZE
        6 -> { // Advisory only, so ignored.
        }