You can uninstall or removes an installed address-book-service-testabili package itself from Ubuntu 16.04 LTS (Xenial Xerus) through the terminal,
$ sudo apt-get remove address-book-service-testabili
If you would like to remove address-book-service-testabili and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove address-book-service-testabili
If you use with purge options to address-book-service-testabili package all the configuration and dependent packages will be removed.
$ sudo apt-get purge address-book-service-testabili
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove address-book-service-testabili