class_docstr: Tests for the ``Wires`` class.
docstr: Test that the hash of a Wires object is being cached.
code: def test_hash_cached(self):
      """Test that the hash of a Wires object is being cached."""
      wires = Wires([0, 1])
      assert wires._hash is None
      h = hash(wires)
      assert wires._hash == h
  
imports: import pytest
  import numpy
  import pennylane
  from pennylane.wires import Wires, WireError
label_desc: Use image node_id 32 for calling the TestWires obj's underlying member method code with example usage: obj.test_hash_cached() without return types