code: def test_cumcount_mi(self):
      mi = MultiIndex.from_tuples(
          [[0, 1], [1, 2], [2, 2], [2, 2], [1, 0]]
      )
      df = DataFrame(
          [["a"], ["a"], ["a"], ["b"], ["a"]], columns=["A"], index=mi
      )
      g = df.groupby("A")
      sg = g.A
  
      expected = Series([0, 1, 2, 0, 3], index=mi)
  
      tm.assert_series_equal(expected, g.cumcount())
      tm.assert_series_equal(expected, sg.cumcount())
  
imports: from itertools import product
  from string import ascii_lowercase
  import numpy
  import pytest
  from pandas import DataFrame, Index, MultiIndex, Period, Series, Timedelta, Timestamp, date_range
  import pandas._testing
label_desc: Use image node_id 4 for calling the TestCounting obj's underlying member method code with example usage: obj.test_cumcount_mi() without return types