code: def test_load_existing_but_not_a_library(self):
      tmp = tempfile.NamedTemporaryFile(delete=False)
      for _ in range(10):
          tmp.write(b"0xdeadbeef\n")
      tmp.close()
      with self.assertRaises(RuntimeError):
          plugin_manager.load_library(tmp.name)
      os.remove(tmp.name)
  
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 3 for calling the TestLoadedPlugin obj's underlying member method code with example usage: obj.test_load_existing_but_not_a_library() without return types