class_docstr: Tests that the Barrier gate is correct.
class_docstr_tok: ["Tests","that","the","Barrier","gate","is","correct","."]
docstr: Test if Barrier is correctly included in queue when controlling
docstr_tok: ["Test","if","Barrier","is","correctly","included","in","queue","when","controlling"]
code: def test_barrier_control(self):
      """Test if Barrier is correctly included in queue when controlling"""
      dev = qml.device("default.qubit", wires=3)
  
      def barrier():
          qml.PauliX(wires=0)
          qml.Barrier(wires=[0, 1])
          qml.CNOT(wires=[0, 1])
  
      @qml.qnode(dev)
      def circuit():
          barrier()
          qml.ctrl(barrier, 2)()
          return qml.state()
  
      circuit()
      tape = circuit.tape.expand(
          stop_at=lambda op: op.name in ["Barrier", "PauliX", "CNOT"]
      )
  
      assert tape.operations[1].name == "Barrier"
      assert tape.operations[4].name == "Barrier"
  
imports: import pytest
  import numpy
  from pennylane import Snapshot
  import pennylane
label_desc: Use image node_id 5 for calling the TestBarrier obj's underlying member method code with example usage: obj.test_barrier_control() and returns: qml