code: def test_matrix(tol):
      """Test that the matrix representation is correct."""
  
      res_static = qml.GroverOperator.compute_matrix(2, work_wires=None)
      res_dynamic = qml.GroverOperator(wires=[0, 1]).matrix()
      res_reordered = qml.GroverOperator(wires=[0, 1]).matrix([1, 0])
  
      expected = np.array(
          [
              [-0.5, 0.5, 0.5, 0.5],
              [0.5, -0.5, 0.5, 0.5],
              [0.5, 0.5, -0.5, 0.5],
              [0.5, 0.5, 0.5, -0.5],
          ]
      )
  
      assert np.allclose(res_static, expected, atol=tol, rtol=0)
      assert np.allclose(res_dynamic, expected, atol=tol, rtol=0)
      # reordering should not affect this particular matrix
      assert np.allclose(res_reordered, expected, atol=tol, rtol=0)
  
file_path: pennylane/tests/templates/test_subroutines/test_grover.py
imports: import functools
  import itertools
  import pytest
  import numpy
  import pennylane
  from pennylane.ops import Hadamard, PauliZ, MultiControlledX
label_desc: Use image node_id 12 for calling a global function with example usage: test_matrix(tol) without return types