<chapter xmlns="http://docbook.org/ns/docbook"
        xmlns:xlink="http://www.w3.org/1999/xlink"
        xmlns:xi="http://www.w3.org/2001/XInclude"
        version="5.0"
        xml:id="sec-nixos-tests">
 <title>NixOS Tests</title>
 <para>
  When you add some feature to NixOS, you should write a test for it. NixOS
  tests are kept in the directory
  <filename
xlink:href="https://github.com/NixOS/nixpkgs/tree/master/nixos/tests">nixos/tests</filename>,
  and are executed (using Nix) by a testing framework that automatically starts
  one or more virtual machines containing the NixOS system(s) required for the
  test.
 </para>
 <xi:include href="writing-nixos-tests.xml" />
 <xi:include href="running-nixos-tests.xml" />
 <xi:include href="running-nixos-tests-interactively.xml" />
</chapter>
