Ask HN: Automated ISP speed test logger

Australia's internet is notoriously slow [1] and unfortunately I'm one of the unlucky majority who has a poor internet connection. Are there any automated speed test tools that I can let run a few days to build a case and complain to my ISP?

[1] https://www.theguardian.com/technology/2017/jul/07/australian-internet-slow-and-plagued-by-disconnections-survey-finds