code: def test_matmul(A):
      assert np.all((A @ A.T).todense() == A.dot(A.T).todense())
  
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 10 for calling a global function with example usage: test_matmul(A) without return types