python3Packages.beautifulsoup4: add some key reverse dependencies to passthru.tests

pkgs/development/python-modules/beautifulsoup4/default.nix

@@ -8,6 +8,14 @@
 , pythonOlder
 , soupsieve
 , sphinxHook
+
+# for passthru.tests
+, html-sanitizer
+, markdownify
+, mechanicalsoup
+, nbconvert
+, subliminal
+, wagtail
 }:
 
 buildPythonPackage rec {
@@ -43,6 +51,15 @@ buildPythonPackage rec {
     "bs4"
   ];
 
+  passthru.tests = {
+    inherit html-sanitizer
+      markdownify
+      mechanicalsoup
+      nbconvert
+      subliminal
+      wagtail;
+  };
+
   meta = with lib; {
     changelog = "https://git.launchpad.net/beautifulsoup/tree/CHANGELOG?h=${version}";
     homepage = "http://crummy.com/software/BeautifulSoup/bs4/";