code: def test_setitem_cache_updating(self, do_ref):
      # GH 5424
      cont = ["one", "two", "three", "four", "five", "six", "seven"]
  
      df = DataFrame(
          {"a": cont, "b": cont[3:] + cont[:3], "c": np.arange(7)}
      )
  
      # ref the cache
      if do_ref:
          df.loc[0, "c"]
  
      # set it
      df.loc[7, "c"] = 1
  
      assert df.loc[0, "c"] == 0.0
      assert df.loc[7, "c"] == 1.0
  
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 2 for calling the TestCaching obj's underlying member method code with example usage: obj.test_setitem_cache_updating(do_ref) without return types