code: def test_error_series_no_name_multi_input_series_processor(
      dummy_data,
  ):
      def abs_diff(sig1, sig2):
          return pd.Series(np.abs(sig1 - sig2)).rename()
  
      # Check if abs_diff returns a series without a name
      abs_diff_tmp_eda = abs_diff(dummy_data["TMP"], dummy_data["EDA"])
      assert isinstance(abs_diff_tmp_eda, pd.Series)
      assert abs_diff_tmp_eda.name is None
  
      series_processor = SeriesProcessor(
          series_names=[("EDA", "TMP")],
          function=abs_diff,
      )
      series_dict = dataframe_to_series_dict(dummy_data)
  
      with pytest.raises(Exception):
          _ = series_processor(series_dict)
  
imports: from typing import List
  import numpy
  import pandas
  import pytest
  from pandas.testing import assert_index_equal, assert_series_equal
  from tsflex.processing import SeriesProcessor, dataframe_func
  from .utils import dataframe_to_series_dict, dummy_data, series_to_series_dict
label_desc: Use image node_id 21 for calling a global function with example usage: test_error_series_no_name_multi_input_series_processor(dummy_data) and returns: pd