Build the package in the current directory and run all tests directly on the system

Run tests on Debian packages.
More information: <https://wiki.debian.org/ContinuousIntegration/autopkgtest>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

autopkgtest -- {{null}}

click the source code to copy install autopkgtest on any operating system with command-not-found.com