code: def test_sp_save():
      happy_ns.save("model/")
      result_before = happy_ns.predict_next_sentence(
          "How old are you?", "The Eiffel Tower is in Paris."
      )
  
      happy = HappyNextSentence("BERT", model_name="model/")
      result_after = happy.predict_next_sentence(
          "How old are you?", "The Eiffel Tower is in Paris."
      )
  
      assert result_before == result_after
  
imports: from happytransformer import HappyNextSentence
  from tests import happy_ns
label_desc: Use image node_id 3 for calling a global function with example usage: test_sp_save() without return types