class_docstr: Tests ``default_bit_map`` helper function.
class_docstr_tok: ["Tests","``","default_bit_map","``","helper","function","."]
docstr: Test creating empty bit map
docstr_tok: ["Test","creating","empty","bit","map"]
code: def test_empty(self):
      """Test creating empty bit map"""
      # pylint: disable=use-implicit-booleaness-not-comparison
      bit_map = default_bit_map([])
      assert bit_map == {}
  
      bit_map = default_bit_map([qml.measurements.MidMeasureMP(0)])
      assert bit_map == {}
  
imports: import pytest
  import pennylane
  from pennylane.drawer.utils import default_wire_map, default_bit_map, convert_wire_order, unwrap_controls, cwire_connections
  from pennylane.wires import Wires
label_desc: Use image node_id 1 for calling the TestDefaultBitMap obj's underlying member method code with example usage: obj.test_empty() without return types