code: def null():
      """Return a dummy null distribution that can be reused across tests."""
      return [
          -10,
          -9,
          -9,
          -3,
          -2,
          -1,
          -1,
          0,
          1,
          1,
          1,
          2,
          3,
          3,
          4,
          4,
          7,
          8,
          8,
          9,
      ]
  
imports: import math
  import numpy
  import pytest
  from numpy.testing import assert_array_almost_equal
  from scipy.ndimage import generate_binary_structure
  from nilearn.mass_univariate import _utils
  from nilearn.mass_univariate.tests._testing import get_tvalue_with_alternative_library
label_desc: Use image node_id 1 for calling a global function with example usage: null() and returns: list