code: def test_spilu():
      X = scipy.sparse.csc_array(
          [
              [1, 0, 0, 0],
              [2, 1, 0, 0],
              [3, 2, 1, 0],
              [4, 3, 2, 1],
          ]
      )
      LU = spla.spilu(X)
      npt.assert_allclose(
          LU.solve(np.array([1, 2, 3, 4])),
          np.asarray([1, 0, 0, 0], dtype=np.float64),
          rtol=1e-14,
          atol=3e-16,
      )
  
imports: import pytest
  import numpy
  import numpy.testing
  import scipy.sparse
  import scipy.sparse.linalg
  from scipy._lib._util import VisibleDeprecationWarning
label_desc: Use image node_id 33 for calling a global function with example usage: test_spilu() without return types