code: def inputs(self) -> List[Union[ENTITY_TYPE]]:
      return [self._mock_input]
  
imports: from typing import Dict, Any, Set, List, Union
  import pytest
  from ..input_column_selector import InputColumnSelector
  from ......core import TileableData, ENTITY_TYPE
  from ......core.operand import Operand
  from ......dataframe import DataFrame, Series
  from ......tensor import tensor
label_desc: Use image node_id 1 for calling the MockOperand obj's underlying member method code with example usage: obj.inputs() and returns: list