$ sudo apt-get update
$ sudo apt-get install ruby-appraisal 

ruby-appraisal is installed in your system.

Make ensure the ruby-appraisal package were installed using the commands given below,

$ sudo dpkg-query -l | grep ruby-appraisal *

You will get with ruby-appraisal package name, version, architecture and description in a table

ruby-appraisal package basic information: