code: def test_in_out(self):
      self._create_random_model()
      tts_root_path = get_tests_input_path()
      tts_checkpoint = os.path.join(tts_root_path, "checkpoint_10.pth")
      tts_config = os.path.join(
          tts_root_path, "dummy_model_config.json"
      )
      synthesizer = Synthesizer(tts_checkpoint, tts_config, None, None)
      synthesizer.tts("Better this test works!!")
  
file_path: TTS/tests/inference_tests/test_synthesizer.py
imports: import os
  import unittest
  from trainer.io import save_checkpoint
  from tests import get_tests_input_path
  from TTS.config import load_config
  from TTS.tts.models import setup_model
  from TTS.utils.synthesizer import Synthesizer
label_desc: Use image node_id 2 for calling the SynthesizerTest obj's underlying member method code with example usage: obj.test_in_out() without return types