{
  self,

  lib,
  nix,
  python3,

  utils,
  dream2nixWithExternals,
  ...
}:
let
 l = lib // builtins;

in
  utils.writePureShellScript
    [
      nix
    ]
    ''
      export dream2nixSrc=${dream2nixWithExternals}
      ${python3.pkgs.pytest}/bin/pytest ${self}/tests/unit "$@"
    ''