code: def __init__(self, *args, **kwargs):
      super().__init__(*args, **kwargs)
      self.batch = Batch(pd.DataFrame([None]))
  
file_path: evadb/test/unit_tests/expression/test_arithmetic.py
imports: import unittest
  import pandas
  from evadb.expression.abstract_expression import ExpressionType
  from evadb.expression.arithmetic_expression import ArithmeticExpression
  from evadb.expression.constant_value_expression import ConstantValueExpression
  from evadb.models.storage.batch import Batch
label_desc: Use image node_id 1 to create a new ArithmeticExpressionsTest object from inherited base classes: unittest with example: obj = ArithmeticExpressionsTest()