Credits to Matt Martz.

1. clone speedtest-cli repository
   

   git clone https://github.com/sivel/speedtest-cli.git

2. create symlink
   

   ln -s [PATH TO GITREPO]/speedtest-cli/speedtest-cli /usr/local/bin/speedtest-cli

3. show help file
   

   speedtest-cli --help

4. run speedtest
   

   speedtest-cli