code: def setUp(self):
      # Create a mock LoadMetricsSummary object with the required attributes
      lm_summary_mock_data = {
          "e9919752e5e8d757765d97d8bec910a2e78e8826f20bce46fd58f92e": {
              "node:172.31.6.57": [0.0, 1.0],
              "object_store_memory": [0.0, 13984228147.0],
              "memory": [0.0, 27968456295.0],
              "node:__internal_head__": [0.0, 1.0],
              "CPU": [0.0, 8.0],
          }
      }
      self.lm_summary_mock = Mock()
      self.lm_summary_mock.usage_by_node = lm_summary_mock_data
  
file_path: ray/python/ray/tests/autoscaler/util.py
imports: import unittest
  from unittest.mock import Mock
  from ray.autoscaler._private.util import get_per_node_breakdown_as_dict
label_desc: Use image node_id 1 for calling the TestGetPerNodeBreakdown obj's underlying member method code with example usage: obj.setUp() without return types