class_docstr: Tests of input validation and output correctness of function `generate_shift_rule`.
class_docstr_tok: ["Tests","of","input","validation","and","output","correctness","of","function","`","generate_shift_rule","`","."]
docstr: Test that the second order shift rule is correct and
  properly simplified when custom shift values are provided
code: def test_second_order_two_term_shift_rule_custom_shifts(self):
      """Test that the second order shift rule is correct and
      properly simplified when custom shift values are provided"""
      frequencies = (1,)
      generated_terms = generate_shift_rule(
          frequencies, shifts=(np.pi / 4,), order=2
      )
      correct_terms = [[-1, 0], [0.5, -np.pi / 2], [0.5, np.pi / 2]]
      assert np.allclose(generated_terms, correct_terms)
  
imports: import pytest
  import numpy
  import pennylane
  from pennylane.gradients.general_shift_rules import eigvals_to_frequencies, frequencies_to_period, generate_shift_rule, _get_shift_rule, generate_multi_shift_rule, generate_shifted_tapes, generate_multishifted_tapes, _iterate_shift_rule_with_multipliers
label_desc: Use image node_id 11 for calling the TestGenerateShiftRule obj's underlying member method code with example usage: obj.test_second_order_two_term_shift_rule_custom_shifts() without return types