class_docstr: Test the logic associated with the QueuingManager class.
class_docstr_tok: ["Test","the","logic","associated","with","the","QueuingManager","class","."]
docstr: Test that if there are no active contexts, active_context() returns None
docstr_tok: ["Test","that","if","there","are","no","active","contexts",",","active_context","(",")","returns","None"]
code: def test_no_active_context(self):
      """Test that if there are no active contexts, active_context() returns None"""
      assert QueuingManager.active_context() is None
  
imports: from multiprocessing.dummy import Pool
  import pytest
  import numpy
  import pennylane
  from pennylane.queuing import AnnotatedQueue, QueuingManager, QueuingError, WrappedObj
label_desc: Use image node_id 3 for calling the TestQueuingManager obj's underlying member method code with example usage: obj.test_no_active_context() without return types