class_docstr: Test the construction of composite ops.
class_docstr_tok: ["Test","the","construction","of","composite","ops","."]
docstr: Test that queue_idx is None.
docstr_tok: ["Test","that","queue_idx","is","None","."]
code: def test_queue_idx(self):
      """Test that queue_idx is None."""
      op = ValidOp(*self.simple_operands)
      assert op.queue_idx is None
  
imports: from copy import copy
  import numpy
  import pytest
  import pennylane
  from pennylane.operation import DecompositionUndefinedError
  from pennylane.ops.op_math import CompositeOp, Prod, Sum, SProd
  from pennylane.wires import Wires
label_desc: Use image node_id 4 for calling the TestConstruction obj's underlying member method code with example usage: obj.test_queue_idx() without return types