tests.trivial-builders: add requireFile test

This asserts that the names of derivations created with requireFile
are not influenced by differing package sets.

pkgs/build-support/trivial-builders/test/default.nix

@@ -25,6 +25,7 @@ recurseIntoAttrs {
   symlinkJoin = recurseIntoAttrs (callPackage ./symlink-join.nix { });
   overriding = callPackage ../test-overriding.nix { };
   inherit references;
+  requireFile = callPackage ./requireFile.nix { };
   writeCBin = callPackage ./writeCBin.nix { };
   writeClosure-union = callPackage ./writeClosure-union.nix {
     inherit (references) samples;

pkgs/build-support/trivial-builders/test/requireFile.nix

@@ -0,0 +1,22 @@
+{
+  pkgsStatic,
+  lib,
+  requireFile,
+  emptyFile,
+}:
+let
+  name = "this-is-a-test";
+  requireFileTest =
+    requireFile:
+    requireFile {
+      inherit name;
+      url = "this-is-a-test";
+      hash = lib.fakeHash;
+    };
+  requireFile-native = requireFileTest requireFile;
+  requireFile-static = requireFileTest pkgsStatic.requireFile;
+in
+assert lib.assertMsg (
+  requireFile-native.name == name && requireFile-static.name == name
+) "requireFile derivation name must be the same across different package sets";
+emptyFile