code: def test_expm_multiply(matrices):
      A_dense, A_sparse, b = matrices
      x0 = splin.expm_multiply(A_dense, b)
      x = splin.expm_multiply(A_sparse, b)
      assert_allclose(x, x0)
  
imports: import pytest
  import numpy
  import scipy.sparse
  import scipy.sparse.linalg
  from numpy.testing import assert_allclose, assert_equal
label_desc: Use image node_id 19 for calling a global function with example usage: test_expm_multiply(matrices) without return types