code: def test_synthesize():
      """Test synthesize.py with diffent arguments."""
      output_path = os.path.join(get_tests_output_path(), "output.wav")
      run_cli("tts --list_models")
  
      # single speaker model
      run_cli(
          f'tts --text "This is an example." --out_path "{output_path}"'
      )
      run_cli(
          "tts --model_name tts_models/en/ljspeech/glow-tts "
          f'--text "This is an example." --out_path "{output_path}"'
      )
      run_cli(
          "tts --model_name tts_models/en/ljspeech/glow-tts  "
          "--vocoder_name vocoder_models/en/ljspeech/multiband-melgan "
          f'--text "This is an example." --out_path "{output_path}"'
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_synthesize() without return types