Test partial message without message type

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Test partial message without length field

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Test partial message with partial length field

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Test partial message without byte field

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Test partial message with partial byte field

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>