code: def test_adding_to_empty_frame_batch_returns_itself(self):
      batch_1 = Batch(frames=pd.DataFrame())
      batch_2 = Batch(frames=create_dataframe())
  
      self.assertEqual(batch_2, batch_1 + batch_2)
      self.assertEqual(batch_2, batch_2 + batch_1)
  
imports: import unittest
  from test.util import create_dataframe, create_dataframe_same
  import numpy
  import pandas
  from evadb.models.storage.batch import Batch
  from evadb.parser.alias import Alias
label_desc: Use image node_id 10 for calling the BatchTest obj's underlying member method code with example usage: obj.test_adding_to_empty_frame_batch_returns_itself() without return types