import ./make-test-python.nix ( { ... }: let machineName = "machine"; settingName = "prefix"; settingValue = "/some/path"; in { name = "npmrc"; nodes."${machineName}".programs.npm = { enable = true; npmrc = '' ${settingName} = ${settingValue} ''; }; testScript = '' ${machineName}.start() assert ${machineName}.succeed("npm config get ${settingName}") == "${settingValue}\n" ''; } )