code: def setUpClass(cls):
      cls._access_key = sys.argv[1]
      cls._platform = sys.argv[2]
      cls._arch = "" if len(sys.argv) != 4 else sys.argv[3]
      cls._root_dir = os.path.join(
          os.path.dirname(__file__), "../../.."
      )
  
file_path: porcupine/demo/c/test/test_porcupine_c.py
imports: import os.path
  import subprocess
  import sys
  import unittest
  from parameterized import parameterized
  from test_util import *
label_desc: Use image node_id 1 for calling the PorcupineCTestCase obj's underlying member method code with example usage: obj.setUpClass(cls) without return types