doc: extract manpage-urls test into its own package

doc/default.nix

@@ -93,26 +93,6 @@ in pkgs.stdenv.mkDerivation {
 
   passthru = {
     inherit pythonInterpreterTable;
-    tests.manpage-urls = with pkgs; testers.invalidateFetcherByDrvHash
-    ({ name ? "manual_check-manpage-urls"
-     , script
-     , urlsFile
-     }: runCommand name {
-      nativeBuildInputs = [
-        cacert
-        (python3.withPackages (p: with p; [
-          aiohttp
-          rich
-          structlog
-        ]))
-      ];
-      outputHash = "sha256-47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=";  # Empty output
-    } ''
-      python3 ${script} ${urlsFile}
-      touch $out
-    '') {
-      script = ./tests/manpage-urls.py;
-      urlsFile = ./manpage-urls.json;
-    };
+    tests.manpage-urls = callPackage ./tests/manpage-urls.nix { };
   };
 }

doc/tests/manpage-urls.nix

@@ -0,0 +1,31 @@
+{
+  lib,
+  runCommand,
+  invalidateFetcherByDrvHash,
+  cacert,
+  python3,
+}:
+
+invalidateFetcherByDrvHash (
+  {
+    name ? "manual_check-manpage-urls",
+    script ? ./manpage-urls.py,
+    urlsFile ? ../manpage-urls.json,
+  }:
+  runCommand name
+    {
+      nativeBuildInputs = [
+        cacert
+        (python3.withPackages (p: [
+          p.aiohttp
+          p.rich
+          p.structlog
+        ]))
+      ];
+      outputHash = "sha256-47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU="; # Empty output
+    }
+    ''
+      python3 ${script} ${urlsFile}
+      touch $out
+    ''
+) { }