code: def df(self):
      df = DataFrame(
          {
              "key1": get_test_data(),
              "key2": get_test_data(),
              "data1": np.random.default_rng(2).standard_normal(50),
              "data2": np.random.default_rng(2).standard_normal(50),
          }
      )
  
      # exclude a couple keys for fun
      df = df[df["key2"] > 1]
      return df
  
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 1 for calling the TestJoin obj's underlying member method code with example usage: obj.df() and returns: df