code: def test_invalid_normalisation(self):
      # both ortho and normalise_idft cannot be True
      self.assertRaisesRegex(
          ValueError,
          "Invalid options: ortho",
          FFTW,
          self.input_array,
          self.output_array,
          direction="FFTW_BACKWARD",
          ortho=True,
          normalise_idft=True,
      )
  
imports: from pyfftw import FFTW, empty_aligned, is_byte_aligned, simd_alignment
  import pyfftw
  from .test_pyfftw_base import run_test_suites, miss, require
  import unittest
  import numpy
  import warnings
label_desc: Use image node_id 20 for calling the FFTWMiscTest obj's underlying member method code with example usage: obj.test_invalid_normalisation() without return types