class_docstr: Test the wire labels.
docstr: Test show_all_wires forces empty wires to display when empty wire is in wire order.
docstr_tok: ["Test","show_all_wires","forces","empty","wires","to","display","when","empty","wire","is","in","wire","order","."]
code: def test_show_all_wires_and_wire_order(self):
      """Test show_all_wires forces empty wires to display when empty wire is in wire order."""
  
      @qml.qnode(qml.device("default.qubit", wires=1))
      def circ():
          return qml.expval(qml.PauliZ(0))
  
      split_str = draw(
          circ, wire_order=[0, "a"], show_all_wires=True
      )().split("\n")
      assert split_str[0][:2] == "0:"
      assert split_str[1][:2] == "a:"
  
imports: from functools import partial
  import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.drawer import draw
label_desc: Use image node_id 4 for calling the TestLabelling obj's underlying member method code with example usage: obj.test_show_all_wires_and_wire_order() and returns: qml