$ sudo apt-get remove gjs-tests 

Uninstall gjs-tests including dependent package

If you would like to remove gjs-tests and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove gjs-tests 

Use Purging gjs-tests

If you use with purge options to gjs-tests package all the configuration and dependent packages will be removed.

$ sudo apt-get purge gjs-tests 

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 gjs-tests 

See Also,