code: def test_V():
      """Test for the _make_V function"""
      dim = 4
  
      V_expected = -np.eye(dim)
      V_expected[1, 1] = V_expected[3, 3] = 1
      V = _make_V(dim)
  
      assert np.allclose(V, V_expected)
  
imports: import numpy
  import pytest
  from scipy.stats import norm
  import pennylane
  from pennylane.templates.subroutines.qmc import QuantumMonteCarlo, _make_V, _make_Z, func_to_unitary, make_Q, probs_to_unitary
  from pennylane.wires import Wires
label_desc: Use image node_id 1 for calling a global function with example usage: test_V() without return types