significantly improve purity

tests/basic/test.nix

@@ -1,22 +1,23 @@
-{
-  pkgs,
-  lib,
-  config,
-  ...
-}:
+{ dynix, ... }:
+
 {
   name = "nixos-test-dynamicism-main";
 
   defaults = { ... }: { };
 
-  #node.pkgsReadOnly = false;
-
   extraPythonPackages = p: [
     p.beartype
   ];
 
   nodes.machine = { pkgs, config, ... }: {
-    imports = [ ./configuration.nix ];
+    # NOTE: Anything in this `nodes.machine = ` module will not be included
+    # in the VM's NixOS configuration once it does `nixos-rebuild switch`,
+    # except for `./configuration.nix` which will be copied to `/etc/nixos/`.
+    # dynix will also be statefully installed to root's user profile.
+    imports = [
+      ./configuration.nix
+      (toString dynix)
+    ];
 
     system.includeBuildDependencies = true;
     system.switch.enable = true;