args@
{ system
, pkgs ? import ../.. { inherit system config; }
  # Use a minimal kernel?
, minimal ? false
  # Ignored
, config ? { }
  # !!! See comment about args in lib/modules.nix
, specialArgs ? throw "legacy - do not use, see error below"
  # Modules to add to each VM
, extraConfigurations ? [ ]
}:
let
  nixos-lib = import ./default.nix { inherit (pkgs) lib; };
in

pkgs.lib.throwIf (args?specialArgs) ''
  testing-python.nix: `specialArgs` is not supported anymore. If you're looking
  for the public interface to the NixOS test framework, use `runTest`, and
  `node.specialArgs`.
  See https://nixos.org/manual/nixos/unstable/index.html#sec-calling-nixos-tests
  and https://nixos.org/manual/nixos/unstable/index.html#test-opt-node.specialArgs
''
rec {

  inherit pkgs;

  evalTest = module: nixos-lib.evalTest { imports = [ extraTestModule module ]; };
  runTest = module: nixos-lib.runTest { imports = [ extraTestModule module ]; };

  extraTestModule = {
    config = {
      hostPkgs = pkgs;
    };
  };

  # Make a full-blown test (legacy)
  # For an official public interface to the tests, see
  # https://nixos.org/manual/nixos/unstable/index.html#sec-calling-nixos-tests
  makeTest =
    { machine ? null
    , nodes ? {}
    , testScript
    , enableOCR ? false
    , name ? "unnamed"
    , skipTypeCheck ? false
      # Skip linting (mainly intended for faster dev cycles)
    , skipLint ? false
    , passthru ? {}
    , meta ? {}
    , # For meta.position
      pos ? # position used in error messages and for meta.position
        (if meta.description or null != null
          then builtins.unsafeGetAttrPos "description" meta
          else builtins.unsafeGetAttrPos "testScript" t)
    , extraPythonPackages ? (_ : [])
    , interactive ? {}
    } @ t: let
    testConfig =
      (evalTest {
        imports = [
          { _file = "makeTest parameters"; config = t; }
          {
            defaults = {
              _file = "makeTest: extraConfigurations";
              imports = extraConfigurations;
            };
          }
        ];
      }).config;
    in
      testConfig.test   # For nix-build
        // testConfig;  # For all-tests.nix

  simpleTest = as: (makeTest as).test;

}