@zommelI am using the very Helpful Tool speedtes-cli on the Command Line inside of Linux.
There is also a Mac Version available.
http://macappstore.org/speedtest_cli/Click also on the Github Link for the full Documentation.
Speedtest-cli gives you the RAW-Information about your current Internetspeed,
without these stupid Scripts that loads in a Browser on these normal Speedtest Webpages.