code: def test_joblib_backend(self):
      view = self.client.load_balanced_view()
      view.register_joblib_backend("view")
      p = Parallel(backend="view")
      result = p(delayed(neg)(i) for i in range(10))
      assert result == [neg(i) for i in range(10)]
  
file_path: ipyparallel/ipyparallel/tests/test_joblib.py
imports: import warnings
  from unittest import mock
  import pytest
  import ipyparallel
  from .clienttest import ClusterTestCase, add_engines
label_desc: Use image node_id 4 for calling the TestJobLib obj's underlying member method code with example usage: obj.test_joblib_backend() without return types