Download:
https://github.com/sivel/speedtest-cli
https://pypi.python.org/pypi/speedtest-cli/

#!/bin/sh
for i in $( speedtest-cli/speedtest.py --list|grep "$1"|awk -F \) '{ print $1 }' ); do speedtest-cli/speedtest.py --server $i; echo; done

Use only NL servers:

#!/bin/sh
for i in $( speedtest-cli/speedtest.py --list|grep Netherlands|awk -F \) '{ print $1 }' ); do speedtest-cli/speedtest.py --server $i; echo; done

Update 2022:

There’s also a native cli tool now: https://www.speedtest.net/apps/cli