code: def test_get_linux_os_release_properties(self):
      properties = """
          KEY=value
          KEY2=value2
          KEY3=value3
          """
      mock = mock_open(read_data=properties)
      with patch("artifact_repository.os.path") as path_mock:
          path_mock.is_file.return_value = True
          with patch("artifact_repository.open", mock, create=True):
              properties = get_linux_os_release_properties()
      self.assertEqual(properties["KEY3"], "value3")
  
imports: import unittest
  from unittest.mock import MagicMock, mock_open, patch
  from artifact_repository import *
label_desc: Use image node_id 6 for calling the TestArtifactRepositoryTool obj's underlying member method code with example usage: obj.test_get_linux_os_release_properties() without return types