Add container test driver #333
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…lakes and ptpython
Add documentation for recently added features: - Testinfra assertions for services, files, and users - Subtest context manager for grouping tests with timing - Test script validation with mypy and pyflakes - Available symbols table including machine, machines, driver
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Avoid hardcoding hostPlatform in example and test modules by setting nixpkgs.hostPlatform appropriately.
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Implement a faster feedback loop for testing system-manager using containerized Ubuntu 24.04 image with system-manager.
Uses the uid-range sandbox feature to run systemd-nspawn inside Nix builds. Tests are hermetic and reproducible.
Tests run on Ubuntu 24.04 with Nix installed via nix-installer, matching how system-manager is actually deployed on non-NixOS systems. This catches issues that wouldn't surface in a VM test.
Uses the same API as NixOS VM tests (start_all(), machine.succeed(), wait_for_unit(), etc.), so developers familiar with NixOS testing can use it immediately.
For people familiar with testinfra (common in ansible, salt unit testing), we have added the testinfra library on top of the basic python test API. It adds declarative assertions (
machine.service("nginx").is_running,machine.file("/etc/foo").contains("bar")) that are more readable than shell commands and provide better error messages.--interactivemode drops into a ptpython REPL inside the running container for exploratory debugging with tab completion (require root access).Heavily inspired by https://git.clan.lol/clan/clan-core/src/branch/main/lib/test/container-test-driver and the current NixOS tests.
Supersedes #328