generic .dev or .test address for localhost in linux mint with DNS masq

I was looking up instructions on the web how to configure my DNS Masq so that I have a generic .test domain but was struggling to find the correct configuration file.

First some info about DNS Masq on linux mint 18.3

• DNS Masq is preinstalled.
• It's a dependency of the network-manager.
• I found the configuration location with the command ps ax | grep dnsmasq
• That appeared to be: /etc/NetworkManager/dnsmasq.d/
• So it's not a configuration file (as told in most instructioins I found) but a configuration directory.
• You just need one line in the configuration file and no separate resolver file.

So how does it work?

• In /etc/NetworkManager/dnsmasq.d/ create a new file.
• The name of this file should be the name of your extension, so in my case: test.
• sudo touch test
• In that file you only need one line of configuration
• address=/test/127.0.0.1
• Restart: sudo service network-manager restart
• Test: ping somethingrandom.test