code: def test_ngroup_cumcount_pair(self):
      # brute force comparison for all small series
      for p in product(range(3), repeat=4):
          df = DataFrame({"a": p})
          g = df.groupby(["a"])
  
          order = sorted(set(p))
          ngroupd = [order.index(val) for val in p]
          cumcounted = [p[:i].count(val) for i, val in enumerate(p)]
  
          tm.assert_series_equal(g.ngroup(), Series(ngroupd))
          tm.assert_series_equal(g.cumcount(), Series(cumcounted))
  
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 16 for calling the TestCounting obj's underlying member method code with example usage: obj.test_ngroup_cumcount_pair() without return types