added xfail test for xs with pd.IndexSlice argument

Author: arw2019

pandas/tests/test_multilevel.py

@@ -1258,6 +1258,16 @@ def test_level_with_tuples(self):
         tm.assert_frame_equal(result, expected)
         tm.assert_frame_equal(result2, expected)
 
+        # GH 35301
+        msg = (
+            "Expected label or tuple of labels, got "
+            r"\(\('foo', 'qux', 0\), slice\(None, None, None\)\)"
+        )
+        with pytest.raises(TypeError, match=msg):
+            frame.xs(pd.IndexSlice[("foo", "qux", 0), :])
+        with pytest.raises(TypeError, match=msg):
+            series.xs(pd.IndexSlice[("foo", "qux", 0), :])
+
         index = MultiIndex(
             levels=[[("foo", "bar"), ("foo", "baz"), ("foo", "qux")], [0, 1]],
             codes=[[0, 0, 1, 1, 2, 2], [0, 1, 0, 1, 0, 1]],