significantly improve purity

tests/default.nix

@@ -1,8 +1,31 @@
 {
   pkgs ? import <nixpkgs> { },
-  lib ? pkgs.lib,
-}: lib.makeScope lib.callPackageWith (self: let
-  inherit (pkgs.testers) runNixOSTest;
-in {
-  basic = runNixOSTest ./basic/test.nix;
+  qpkgs ? let
+    src = fetchTree (builtins.parseFlakeRef "github:Qyriad/nur-packages");
+  in import src { inherit pkgs; },
+  lib ? qpkgs.lib,
+  dynix ? qpkgs.callPackage ../modules-package.nix { },
+}: let
+
+  runDynixTest = testModule: pkgs.testers.runNixOSTest {
+    imports = [ testModule ];
+
+    # Note: these are arguments to the *test* modules.
+    # Not the NixOS modules for the NixOS configuration the test is testing.
+    # Wew.
+    _module.args = { inherit dynix; };
+
+    # Why is this argument called "extraBaseModule**s**" but take a single module argument...
+    extraBaseModules = { name, ... }: {
+      #imports = [ dynixInjectionModule ];
+      config.environment.systemPackages = [ dynix ];
+      # Just making something in this strict in `name`,
+      # which is only present as an argument for nodes and I don't want to
+      # confuse that with the test modules.
+      config.warnings = builtins.seq name [ ];
+    };
+  };
+
+in lib.makeScope lib.callPackageWith (self: {
+  basic = runDynixTest ./basic/test.nix;
 })