code: def test_qa_save():
      happy_qa.save("model/")
      result_before = happy_qa.answer_question(
          "Natural language processing is a subfield of artificial surrounding creating models that understand language",
          "What is natural language processing?",
      )
  
      happy = HappyQuestionAnswering(model_name="model/")
      result_after = happy.answer_question(
          "Natural language processing is a subfield of artificial surrounding creating models that understand language",
          "What is natural language processing?",
      )
  
      assert result_before[0].answer == result_after[0].answer
  
file_path: happy-transformer/tests/test_qa.py
imports: from happytransformer.happy_question_answering import HappyQuestionAnswering, QATrainArgs, QAEvalArgs, QATestArgs
  import pytest
  from pytest import approx
  from tests import happy_qa
label_desc: Use image node_id 6 for calling a global function with example usage: test_qa_save() without return types