Checkmate - A flake checker (treefmt & nix-unit) for testing other flakes with zero dependencies.#

Checks include:

• treefmt - nixfmt, deadnix, mdformat, yamlfmt. See treefmt.nix.

• nix-unit - The flake being checked (ie, inputs.target) is expected to expose flakeModules.nix-unit:

# Example
flakeModules.nix-unit =
  { inputs, ... }:
  {
    perSystem = (
      { lib, ... }:
      {
        nix-unit.tests = {
          checkmate."test lib works" = {
            expr = lib.removeSuffix ".nix" "hello.nix";
            expected = "hello";
          };
        };
      }
    );
  };

CI Usage#

# On your github action
nix check github:checkmate --override-input target path:$PWD -L --refresh