bpo-31904: Skip os.path.expanduser() tests on VxWorks (GH-23776)

diff --git a/Lib/test/test_pathlib.py b/Lib/test/test_pathlib.py
index 7f7f72c..9be7294 100644
--- a/Lib/test/test_pathlib.py
+++ b/Lib/test/test_pathlib.py
@@ -2467,6 +2467,8 @@ def test_rglob(self):
 
     @unittest.skipUnless(hasattr(pwd, 'getpwall'),
                          'pwd module does not expose getpwall()')
+    @unittest.skipIf(sys.platform == "vxworks",
+                     "no home directory on VxWorks")
     def test_expanduser(self):
         P = self.cls
         import_helper.import_module('pwd')