nixos/tests: extra-python-packages -> nixos-test-driver/extra-python-packages

Categorizing the tests for the test driver helps with testing the test driver.

nixos/doc/manual/development/developing-the-test-driver.chapter.md

@@ -25,6 +25,8 @@ These include `pkgs.nixosTest`, `testing-python.nix` and `make-test-python.nix`.
 
 ## Testing changes to the test framework {#sec-test-the-test-framework}
 
+We currently have limited unit tests for the framework itself. You may run these with `nix-build -A nixosTests.nixos-test-driver`.
+
 When making significant changes to the test framework, we run the tests on Hydra, to avoid disrupting the larger NixOS project.
 
 For this, we use the `python-test-refactoring` branch in the `NixOS/nixpkgs` repository, and its [corresponding Hydra jobset](https://hydra.nixos.org/jobset/nixos/python-test-refactoring).

nixos/tests/all-tests.nix

@@ -66,6 +66,14 @@ let
     ;
 
 in {
+
+  # Testing the test driver
+  nixos-test-driver = {
+    extra-python-packages = handleTest ./nixos-test-driver/extra-python-packages.nix {};
+  };
+
+  # NixOS vm tests and non-vm unit tests
+
   _3proxy = runTest ./3proxy.nix;
   aaaaxy = runTest ./aaaaxy.nix;
   acme = runTest ./acme.nix;
@@ -218,7 +226,6 @@ in {
   etcd-cluster = handleTestOn ["x86_64-linux"] ./etcd-cluster.nix {};
   etebase-server = handleTest ./etebase-server.nix {};
   etesync-dav = handleTest ./etesync-dav.nix {};
-  extra-python-packages = handleTest ./extra-python-packages.nix {};
   evcc = handleTest ./evcc.nix {};
   fancontrol = handleTest ./fancontrol.nix {};
   fcitx5 = handleTest ./fcitx5 {};

nixos/tests/nixos-test-driver/extra-python-packages.nix

@@ -1,4 +1,4 @@
-import ./make-test-python.nix ({ ... }:
+import ../make-test-python.nix ({ ... }:
   {
     name = "extra-python-packages";