Install cl-xlunit by entering the following commands in the terminal:
sudo apt update sudo apt install cl-xlunit
Common Lisp eXtreme Lisp Unit Testing Package
XLUnit provides a unit testing package for Common Lisp. It is based on the XPTest package by OnShore development, but is rewritten to be closer in usage to the JUnit package. Also, it is designed to be used with significantly less overhead on the part of the test author compared to XPTest.