nixosTests.misc: Remove nix tests

  testScript =

    ''

      import json

      def get_path_info(path):

          result = machine.succeed(f"nix --option experimental-features nix-command path-info --json {path}")

          parsed = json.loads(result)

          return parsed

      with subtest("nix-db"):

          info = get_path_info("${foo}")

          print(info)

          if (

              info[0]["narHash"]

              != "sha256-BdMdnb/0eWy3EddjE83rdgzWWpQjfWPAj3zDIFMD3Ck="

          ):

              raise Exception("narHash not set")

          if info[0]["narSize"] != 128:

              raise Exception("narSize not set")

      with subtest("nixos-version"):

          machine.succeed("[ `nixos-version | wc -w` = 2 ]")

      with subtest("shell-vars"):

          machine.succeed('[ -n "$NIX_PATH" ]')

      with subtest("nix-db"):

          machine.succeed("nix-store -qR /run/current-system | grep nixos-")

      with subtest("Test sysctl"):

          machine.wait_for_unit("systemd-sysctl.service")

          assert "1" == machine.succeed("sysctl -ne vm.swappiness").strip()