Re-introduce test

Author: barneygale

Lib/test/test_pathlib/test_pathlib.py

@@ -1108,6 +1108,10 @@ def test_is_mount_root(self):
         self.assertTrue(R.is_mount())
         self.assertFalse((R / '\udfff').is_mount())
 
+    def test_passing_kwargs_errors(self):
+        with self.assertRaises(TypeError):
+            self.cls(foo="bar")
+
     def setUpWalk(self):
         super().setUpWalk()
         sub21_path= self.sub2_path / "SUB21"