gh-117503: Fix test for posixpath.expanduser() when pw_dir ends with / (GH-118056)

Author: serhiy-storchaka

Lib/test/test_posixpath.py

@@ -351,6 +351,7 @@ def test_expanduser_pwd2(self):
         for e in pwd.getpwall():
             name = e.pw_name
             home = e.pw_dir
+            home = home.rstrip('/') or '/'
             self.assertEqual(posixpath.expanduser('~' + name), home)
             self.assertEqual(posixpath.expanduser(os.fsencode('~' + name)),
                              os.fsencode(home))