code: def test_load_unexisting_library(self):
      with self.assertRaises(RuntimeError):
          plugin_manager.load_library("not_a_dali_plugin.so")
  
imports: from nvidia.dali.pipeline import Pipeline
  import nvidia.dali
  import nvidia.dali.ops
  import nvidia.dali.plugin_manager
  import unittest
  import os
  import numpy
  import tempfile
label_desc: Use image node_id 2 for calling the TestLoadedPlugin obj's underlying member method code with example usage: obj.test_load_unexisting_library() without return types