code: def test_raise_if_missing(self):
      df = pd.DataFrame({"a": [1, 2, 3, 4]})
      ds = ray.data.from_pandas(df)
      prep = Concatenator(
          output_column_name="c", exclude=["b"], raise_if_missing=True
      )
  
      with pytest.raises(ValueError, match="'b'"):
          prep.transform(ds).materialize()
  
file_path: ray/python/ray/data/tests/preprocessors/test_concatenator.py
imports: import numpy
  import pandas
  import pytest
  import ray
  from ray.data.preprocessors import Concatenator
label_desc: Use image node_id 2 for calling the TestConcatenator obj's underlying member method code with example usage: obj.test_raise_if_missing() without return types