<chapter xmlns="http://docbook.org/ns/docbook"  xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude" 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
    <literal>nixos/tests</literal>, 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.section.xml" />
  <xi:include href="running-nixos-tests.section.xml" />
  <xi:include href="running-nixos-tests-interactively.section.xml" />
  <xi:include href="linking-nixos-tests-to-packages.section.xml" />
</chapter>
