nixpkgs/nixos/doc/manual/development/nixos-tests.chapter.md

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NixOS Tests

When you add some feature to NixOS, you should write a test for it. NixOS tests are kept in the directory nixos/tests, 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.

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<xi:include href="running-nixos-tests-interactively.section.xml" />
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