lib/tests: simplify access to default system

flake-modules/lib.nix

@@ -27,7 +27,9 @@
         { pkgs, system, ... }:
         {
           # NOTE: this is the publicly documented flake output we've had for a while
-          check = pkgs.callPackage ../lib/tests.nix { inherit self; };
+          check = pkgs.callPackage ../lib/tests.nix {
+            inherit lib self system;
+          };
 
           # NOTE: no longer needs to be per-system
           helpers = lib.warn "nixvim: `<nixvim>.lib.${system}.helpers` has been moved to `<nixvim>.lib.nixvim` and no longer depends on a specific system" self.lib.nixvim;

lib/tests.nix

@@ -1,11 +1,10 @@
 {
   self,
-  pkgs,
-  lib ? pkgs.lib,
-  ...
+  system,
+  lib,
 }:
 let
-  defaultPkgs = pkgs;
+  defaultSystem = system;
 
   # Create a nix derivation from a nixvim executable.
   # The build phase simply consists in running the provided nvim binary.
@@ -31,7 +30,7 @@ let
     {
       name ? null,
       pkgs ? null,
-      system ? defaultPkgs.stdenv.hostPlatform.system,
+      system ? defaultSystem,
       module,
       extraSpecialArgs ? { },
     }:

tests/main.nix

@@ -8,10 +8,13 @@
   pkgs,
   pkgsUnfree,
   self,
+  system,
 }:
 let
   fetchTests = callTest ./fetch-tests.nix { };
-  test-derivation = callPackage ../lib/tests.nix { inherit self; };
+  test-derivation = callPackage ../lib/tests.nix {
+    inherit lib self system;
+  };
   inherit (test-derivation) mkTestDerivationFromNixvimModule;
 
   moduleToTest =