{ nixpkgs ? /etc/nixos/nixpkgs
, hydraSrc ? { outPath = ./.; revCount = 1234; gitTag = "abcdef"; }

{ hydraSrc ? { outPath = ./.; revCount = 1234; gitTag = "abcdef"; }

    with import nixpkgs { };

    with import <nixpkgs> { };

    let pkgs = import nixpkgs {inherit system;}; in

    let pkgs = import <nixpkgs> {inherit system;}; in

    with import "${nixos}/lib/testing.nix" { inherit nixpkgs system; };

    with import <nixos/lib/testing.nix> { inherit system; };