class_docstr: Tests that involve how wires are displayed
class_docstr_tok: ["Tests","that","involve","how","wires","are","displayed"]
docstr: Test show_all_wires=True displays empty wires.
docstr_tok: ["Test","show_all_wires=True","displays","empty","wires","."]
code: def test_show_all_wires(self):
      """Test show_all_wires=True displays empty wires."""
  
      _, ax = qml.draw_mpl(circuit2, show_all_wires=True)(1.23)
  
      assert len(ax.lines) == 3  # three wires
  
      assert len(ax.texts) == 4  # three wire labels and one gate label
      assert ax.texts[0].get_text() == "0"
      assert ax.texts[1].get_text() == "a"
      assert ax.texts[2].get_text() == "1.23"
      plt.close()
  
imports: import pytest
  import pennylane
label_desc: Use image node_id 3 for calling the TestWireBehaviour obj's underlying member method code with example usage: obj.test_show_all_wires() without return types