code: def test_dot(self):
      for M, A_array in self.cases:
          A = interface.aslinearoperator(M)
          M, N = A.shape
  
          x0 = np.array([1, 2, 3])
          x1 = np.array([[1], [2], [3]])
          x2 = np.array([[1, 4], [2, 5], [3, 6]])
  
          assert_equal(A.dot(x0), A_array.dot(x0))
          assert_equal(A.dot(x1), A_array.dot(x1))
          assert_equal(A.dot(x2), A_array.dot(x2))
  
imports: from functools import partial
  from itertools import product
  import operator
  import pytest
  from pytest import raises, warns
  from numpy.testing import assert_, assert_equal
  import numpy
  import scipy.sparse
  from scipy.sparse.linalg import interface
  from scipy.sparse.sputils import matrix
label_desc: Use image node_id 3 for calling the TestAsLinearOperator obj's underlying member method code with example usage: obj.test_dot() without return types