depot/third_party/home-manager/docs/manual/contributing/tests.md
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Tests

Home Manager includes a basic test suite and it is highly recommended to include at least one test when adding a module. Tests are typically in the form of "golden tests" where, for example, a generated configuration file is compared to a known correct file.

It is relatively easy to create tests by modeling the existing tests, found in the tests project directory. For a full reference to the functions available in test scripts, you can look at NMT's bash-lib.

The full Home Manager test suite can be run by executing

$ nix-shell --pure tests -A run.all

in the project root. List all test cases through

$ nix-shell --pure tests -A list

and run an individual test, for example alacritty-empty-settings, through

$ nix-shell --pure tests -A run.alacritty-empty-settings

However, those invocations will impurely source the system's nixpkgs, and may cause failures. To run against the nixpkgs from the flake.lock, use instead e.g.

$ nix develop --ignore-environment .#all