content: """Test fixtures."""
  
  import ast
  import json
  import os
  
  NAPALM_TEST_MOCK = ast.literal_eval(os.getenv("NAPALM_TEST_MOCK", default="1"))
  NAPALM_HOSTNAME = os.getenv("NAPALM_HOSTNAME", default="127.0.0.1")
  NAPALM_USERNAME = os.getenv("NAPALM_USERNAME", default="vagrant")
  NAPALM_PASSWORD = os.getenv("NAPALM_PASSWORD", default="vagrant")
  NAPALM_OPTIONAL_ARGS = json.loads(
      os.getenv("NAPALM_OPTIONAL_ARGS", default='{"port": 12443}')
  )
  
  
  def set_device_parameters(request):
      """Set up the class."""
      if NAPALM_TEST_MOCK:
          driver = request.cls.patched_driver
      else:
          driver = request.cls.driver
  
      request.cls.device = driver(
          NAPALM_HOSTNAME,
          NAPALM_USERNAME,
          NAPALM_PASSWORD,
          timeout=60,
          optional_args=NAPALM_OPTIONAL_ARGS,
      )
      request.cls.device.open()
  
  
  def pytest_generate_tests(metafunc, basefile):
      """Generate test cases dynamically."""
      if metafunc.function.__dict__.get("build_test_cases", False):
          path = os.path.join(
              os.path.dirname(basefile), "mocked_data", metafunc.function.__name__
          )
  
          if os.path.exists(path):
              sub_folders = os.listdir(path)
          else:
              sub_folders = []
  
          test_cases = []
          for test_case in sub_folders:
              if os.path.isdir(os.path.join(path, test_case)):
                  test_cases.append(test_case)
  
          if not test_cases:
              test_cases.append("no_test_case_found")
  
          metafunc.parametrize("test_case", test_cases)
  