class_docstr: Mock class for testing.
code: def add(self, item):
      self.queue.append(item)
  
file_path: wandb/tests/pytest_tests/unit_tests/test_launch/test_runner/test_safe_watch.py
imports: from unittest.mock import MagicMock
  import pytest
  from kubernetes.client import ApiException
  from urllib3.exceptions import ProtocolError
  from wandb.sdk.launch.runner.kubernetes_monitor import SafeWatch
label_desc: Use image node_id 3 for calling the MockWatch obj's underlying member method code with example usage: obj.add(item) without return types