code: def _build_test_obj(obj):
      return (
          build_df(obj, size=2)
          if obj.ndim == 2
          else build_series(obj, size=2, name=obj.name)
      )
  
imports: import numpy
  import pandas
  from ...None import opcodes
  from ...core import recursive_tile
  from ...core.custom_log import redirect_custom_log
  from ...serialization.serializables import KeyField, FunctionField, TupleField, DictField
  from ...utils import has_unknown_shape, enter_current_session, quiet_stdio
  from ..operands import DataFrameOperand, DataFrameOperandMixin, OutputType
  from ..utils import build_df, build_series, build_empty_df, parse_index, validate_output_types
label_desc: Use image node_id 8 for calling the DataFrameCartesianChunk obj's underlying member method code with example usage: obj._build_test_obj(obj) and returns: unknown