code: def df(self):
      return DataFrame(
          {"A": ["a", "b", "a"], "B": ["b", "b", "c"], "C": [1, 2, 3]}
      )
  
imports: import re
  import unicodedata
  import numpy
  import pytest
  import pandas.util._test_decorators
  from pandas.core.dtypes.common import is_integer_dtype
  import pandas
  from pandas import ArrowDtype, Categorical, CategoricalDtype, CategoricalIndex, DataFrame, Index, RangeIndex, Series, SparseDtype, get_dummies
  import pandas._testing
  from pandas.core.arrays.sparse import SparseArray
label_desc: Use image node_id 1 for calling the TestGetDummies obj's underlying member method code with example usage: obj.df() and returns: DataFrame