code: def df2(self):
      return DataFrame(
          {
              "key1": get_test_data(n=10),
              "key2": get_test_data(ngroups=4, n=10),
              "value": np.random.default_rng(2).standard_normal(10),
          }
      )
  
imports: import re
  import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  from pandas import Categorical, DataFrame, Index, MultiIndex, Series, Timestamp, bdate_range, concat, merge, option_context
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestJoin obj's underlying member method code with example usage: obj.df2() and returns: DataFrame