tests.overriding: init

only outputs the first failing test atm

pkgs/test/default.nix

@@ -59,6 +59,8 @@ with pkgs;
 
   nixos-functions = callPackage ./nixos-functions {};
 
+  overriding = callPackage ./overriding.nix { };
+
   patch-shebangs = callPackage ./patch-shebangs {};
 
   texlive = callPackage ./texlive {};

pkgs/test/overriding.nix

@@ -0,0 +1,23 @@
+{ lib, pkgs, stdenvNoCC }:
+
+let
+  tests =
+    let
+      p = pkgs.python3Packages.xpybutil.overridePythonAttrs (_: { dontWrapPythonPrograms = true; });
+    in
+    [
+      ({
+        name = "overridePythonAttrs";
+        expr = !lib.hasInfix "wrapPythonPrograms" p.postFixup;
+        expected = true;
+      })
+    ];
+in
+
+stdenvNoCC.mkDerivation {
+  name = "test-overriding";
+  passthru = { inherit tests; };
+  buildCommand = ''
+    touch $out
+  '' + lib.concatMapStringsSep "\n" (t: "([[ ${lib.boolToString t.expr} == ${lib.boolToString t.expected} ]] && echo '${t.name} success') || (echo '${t.name} fail' && exit 1)") tests;
+}