TST: Changed broken test to xfail pandas-dev#25581

Author: KingOfTheShow69

pandas/tests/groupby/aggregate/test_aggregate.py

@@ -1420,9 +1420,12 @@ def test_multi_axis_1_raises(func):
     [
         ([[20, "A"], [20, "B"], [10, "C"]], {0: [10, 20], 1: ["C", ["A", "B"]]}),
         ([[20, "A"], [20, "B"], [30, "C"]], {0: [20, 30], 1: [["A", "B"], "C"]}),
-        ([["a", 1], ["a", 1], ["b", 2], ["b", 3]], {0: ["a", "b"], 1: [1, [2, 3]]})
-        # This test case still fails
-        # ([["a", 1], ["a", 2], ["b", 3], ["b", 3]], {0: ["a", "b"], 1: [[1, 2], 3]})
+        ([["a", 1], ["a", 1], ["b", 2], ["b", 3]], {0: ["a", "b"], 1: [1, [2, 3]]}),
+        pytest.param(
+            [["a", 1], ["a", 2], ["b", 3], ["b", 3]],
+            {0: ["a", "b"], 1: [[1, 2], 3]},
+            marks=pytest.mark.xfail,
+        ),
     ],
 )
 def test_agg_of_mode_list(test, constant):