pkgsChecked, pkgsParallel, pkgsStrict, pkgsStructured: init (#531835)

pkgs/test/top-level/default.nix

@@ -82,4 +82,18 @@ lib.recurseIntoAttrs {
     assert cross.makeWrapper ? __spliced;
     assert appended.makeWrapper ? __spliced;
     pkgs.emptyFile;
+
+  massRebuildVariantComposition =
+    let
+      variants = [
+        "pkgsChecked"
+        "pkgsParallel"
+        "pkgsStrict"
+        "pkgsStructured"
+      ];
+      all = lib.getAttrFromPath variants pkgs;
+      all-reversed = lib.getAttrFromPath (lib.reverseList variants) pkgs;
+    in
+    assert pkgs.config.allowVariants -> (all.hello == all-reversed.hello);
+    pkgs.emptyFile;
 }

pkgs/top-level/variants.nix

@@ -173,4 +173,25 @@ self: super: {
     ]
     ++ overlays;
   };
+
+  pkgsChecked = nixpkgsFun {
+    config = super.config // {
+      doCheckByDefault = true;
+    };
+  };
+  pkgsParallel = nixpkgsFun {
+    config = super.config // {
+      enableParallelBuildingByDefault = true;
+    };
+  };
+  pkgsStrict = nixpkgsFun {
+    config = super.config // {
+      strictDepsByDefault = true;
+    };
+  };
+  pkgsStructured = nixpkgsFun {
+    config = super.config // {
+      structuredAttrsByDefault = true;
+    };
+  };
 }