class_docstr: Tests that involve how wires are displayed
class_docstr_tok: ["Tests","that","involve","how","wires","are","displayed"]
docstr: Test empty wires do not appear by default
docstr_tok: ["Test","empty","wires","do","not","appear","by","default"]
code: def test_empty_wires(self):
      """Test empty wires do not appear by default"""
  
      _, ax = qml.draw_mpl(circuit2)(1.23)
  
      assert len(ax.lines) == 1  # one wire
      assert len(ax.texts) == 2  # one wire label and one gate label
      assert ax.texts[0].get_text() == "0"
      assert ax.texts[1].get_text() == "RX"
      plt.close()
  
imports: import pytest
  import pennylane
label_desc: Use image node_id 2 for calling the TestWireBehaviour obj's underlying member method code with example usage: obj.test_empty_wires() without return types