Taken from upstream: https://github.com/pdoc3/pdoc/commit/4aa70de2221a34a3003a7e5f52a9b91965f0e359.patch.

From 4aa70de2221a34a3003a7e5f52a9b91965f0e359 Mon Sep 17 00:00:00 2001
From: Spencer Baugh <sbaugh@catern.com>
Date: Thu, 23 Sep 2021 09:00:25 -0400
Subject: [PATCH] TST: use explicit ClassWithNew instead of typing.Generic

typing.Generic doesn't have a __new__ method in 3.9.

Fixes https://github.com/pdoc3/pdoc/issues/355
---
 pdoc/test/__init__.py | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/pdoc/test/__init__.py b/pdoc/test/__init__.py
index e8c3d94..8b67ab7 100644
--- a/pdoc/test/__init__.py
+++ b/pdoc/test/__init__.py
@@ -1043,16 +1043,20 @@ class C2:
 
         self.assertEqual(pdoc.Class('C2', mod, C2).params(), ['a', 'b', 'c=None', '*', 'd=1', 'e'])
 
-        class G(typing.Generic[T]):
+        class ClassWithNew:
+            def __new__(self, arg):
+                pass
+
+        class G(ClassWithNew):
             def __init__(self, a, b, c=100):
                 pass
 
         self.assertEqual(pdoc.Class('G', mod, G).params(), ['a', 'b', 'c=100'])
 
-        class G2(typing.Generic[T]):
+        class G2(ClassWithNew):
             pass
 
-        self.assertEqual(pdoc.Class('G2', mod, G2).params(), ['*args', '**kwds'])
+        self.assertEqual(pdoc.Class('G2', mod, G2).params(), ['arg'])
 
     def test_url(self):
         mod = pdoc.Module(EXAMPLE_MODULE)
'/guix/diff/tests/guix-download.sh?id=6b903e210462f7c1e428e0ded7e690d315e1f7a1'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/guix-download.sh'>
<input type='hidden' name='id' value='6b903e210462f7c1e428e0ded7e690d315e1f7a1'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=6b903e210462f7c1e428e0ded7e690d315e1f7a1'>root</a>/<a href='/guix/log/tests?id=6b903e210462f7c1e428e0ded7e690d315e1f7a1'>tests</a>/<a href='/guix/log/tests/guix-download.sh?id=6b903e210462f7c1e428e0ded7e690d315e1f7a1'>guix-download.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-download.sh?id=6b903e210462f7c1e428e0ded7e690d315e1f7a1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-04-21 16:16:38 +0200'>2023-04-21</span></td><td><a href='/guix/commit/tests/guix-download.sh?id=37dd69b44511dc73eb04bdebe8d82c9a0386338e'>tests: Fix checks for expected failures.</a><span class='msg-avail'>...<span class='msg-tooltip'>Addresses &lt;https://issues.guix.gnu.org/62406&gt;.

With 'set -e', a return status inverted with '!' does not cause the shell to
exit immediately.  Instead use '&amp;&amp; false' to indicate an expected failure.

* tests/guix-archive.sh, tests/guix-build-branch.sh, tests/guix-build.sh,
tests/guix-daemon.sh, tests/guix-download.sh,
tests/guix-environment-container.sh, tests/guix-environment.sh,
tests/guix-gc.sh, tests/guix-git-authenticate.sh, tests/guix-graph.sh,
tests/guix-hash.sh, tests/guix-home.sh, tests/guix-pack-relocatable.sh,
tests/guix-pack.sh, tests/guix-package-aliases.sh, tests/guix-package-net.sh,
tests/guix-package.sh, tests/guix-refresh.sh, tests/guix-shell.sh,
tests/guix-style.sh, tests/guix-system.sh: Replace uses of '! ...' with
'... &amp;&amp; false' or `test ! ...` as appropriate.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Eric Bavier</td></tr>