code: def test_cache_updating(self):
      # GH 4939, make sure to update the cache on setitem
  
      df = DataFrame(
          np.zeros((10, 4)),
          columns=Index(list("ABCD"), dtype=object),
      )
      df["A"]  # cache series
      df.loc["Hello Friend"] = df.iloc[0]
      assert "Hello Friend" in df["A"].index
      assert "Hello Friend" in df["B"].index
  
imports: from string import ascii_letters
  import numpy
  import pytest
  from pandas.errors import SettingWithCopyError, SettingWithCopyWarning
  import pandas
  from pandas import DataFrame, Index, Series, Timestamp, date_range, option_context
  import pandas._testing
label_desc: Use image node_id 22 for calling the TestChaining obj's underlying member method code with example usage: obj.test_cache_updating() without return types