code: def __extend_with_api_ref(raw_testinfo):
      
      api_name = raw_testinfo["api"]
  
      # api maybe defined in two types:
      # 1, individual file: each file is corresponding to one api definition
      # 2, api sets file: one file contains a list of api definitions
      if not os.path.isabs(api_name):
          # make compatible with Windows/Linux
          api_path = os.path.join(tests_def_mapping["PWD"], *api_name.split("/"))
          if os.path.isfile(api_path):
              # type 1: api is defined in individual file
              api_name = api_path
  
      try:
          block = tests_def_mapping["api"][api_name]
          # NOTICE: avoid project_mapping been changed during iteration.
          raw_testinfo["api_def"] = utils.deepcopy_dict(block)
      except KeyError:
          raise exceptions.ApiNotFound("{} not found!".format(api_name))
docs: extend with api reference
  
      Raises:
          exceptions.ApiNotFound: api not found