class_docstr: Common set of functionality for performing tests on the real to
  real transforms. This is not implemented as a distinct test class
  (inheriting from unittest.TestCase) because its `__init__` method
  takes multiple arguments as input which set up the size and
  directions of the transform.
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code: def test_normalisation(self):
      return self._normalisation_factor == float(self.plan._get_N())
  
imports: from __future__ import division
  import itertools
  import random
  import unittest
  import numpy
  import pyfftw
  from pyfftw import _supported_types
  from .test_pyfftw_base import run_test_suites
label_desc: Use image node_id 2 for calling the TestRealTransform obj's underlying member method code with example usage: obj.test_normalisation() and returns: unknown