code: def test_error_func(h, time, n, expected_error):
      """Test that the error function computes the expected precision correctly"""
      computed_error = qml.QDrift.error(h, time, n)
      assert isclose(computed_error, expected_error)
  
imports: import copy
  from functools import reduce
  import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.math import allclose, isclose
  from pennylane.templates.subroutines.qdrift import _sample_decomposition
label_desc: Use image node_id 1 for calling a global function with example usage: test_error_func(h, time, n, expected_error) without return types