class_docstr: Test that the text for empty tapes is correct.
docstr: Test wire order and show_all_wires shows wires with empty tape.
docstr_tok: ["Test","wire","order","and","show_all_wires","shows","wires","with","empty","tape","."]
code: def test_empty_tape_wire_order(self):
      """Test wire order and show_all_wires shows wires with empty tape."""
      expected = "a: ───┤  \nb: ───┤  "
      out = tape_text(
          QuantumScript(), wire_order=["a", "b"], show_all_wires=True
      )
      assert expected == out
  
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.drawer import tape_text
  from pennylane.drawer.tape_text import _add_grouping_symbols, _add_cond_grouping_symbols, _add_mid_measure_grouping_symbols, _add_cwire_measurement_grouping_symbols, _add_cwire_measurement, _add_measurement, _add_op, _Config
  from pennylane.tape import QuantumScript, QuantumTape
label_desc: Use image node_id 2 for calling the TestEmptyTapes obj's underlying member method code with example usage: obj.test_empty_tape_wire_order() without return types