Add vfspath TypeError test (#153987)

typeerror with message test

Author: AjobK

Lib/test/test_pathlib/test_join_windows.py

@@ -87,6 +87,11 @@ def test_vfspath(self):
         p = self.cls(r'\\a\b\c\d')
         self.assertEqual(vfspath(p), '\\\\a\\b\\c\\d')
 
+    def test_invalid_vspath(self):
+        msg = "expected JoinablePath object, not NoneType"
+        with self.assertRaisesRegex(TypeError, msg):
+            vfspath(None)
+
     def test_parts(self):
         P = self.cls
         p = P(r'c:a\b')