code: def test_argument_handler(self):
      qa = QuestionAnsweringArgumentHandler()
  
      Q = "Where was HuggingFace founded ?"
      C = "HuggingFace was founded in Paris"
  
      normalized = qa(Q, C)
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 1)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
      normalized = qa(question=Q, context=C)
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 1)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
      normalized = qa(question=Q, context=C)
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 1)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
      normalized = qa(question=[Q, Q], context=C)
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 2)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
      normalized = qa({"question": Q, "context": C})
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 1)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
      normalized = qa([{"question": Q, "context": C}])
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 1)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
      normalized = qa(
          [{"question": Q, "context": C}, {"question": Q, "context": C}]
      )
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 2)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
      normalized = qa(X={"question": Q, "context": C})
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 1)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
      normalized = qa(X=[{"question": Q, "context": C}])
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 1)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
      normalized = qa(data={"question": Q, "context": C})
      self.assertEqual(type(normalized), list)
      self.assertEqual(len(normalized), 1)
      self.assertEqual({type(el) for el in normalized}, {SquadExample})
  
imports: import unittest
  from transformers import MODEL_FOR_QUESTION_ANSWERING_MAPPING, TF_MODEL_FOR_QUESTION_ANSWERING_MAPPING, LxmertConfig, QuestionAnsweringPipeline
  from transformers.data.processors.squad import SquadExample
  from transformers.pipelines import QuestionAnsweringArgumentHandler, pipeline
  from transformers.testing_utils import nested_simplify, require_tf, require_torch, require_torch_or_tf, slow
  from .test_pipelines_common import ANY, PipelineTestCaseMeta
label_desc: Use image node_id 1 for calling the QuestionAnsweringArgumentHandlerTests obj's underlying member method code with example usage: obj.test_argument_handler() without return types