code: def test_option_lsmr_maxiter(self):
      # Should work with positive integers or None
      _ = lsq_linear(A, b, lsq_solver="lsmr", lsmr_maxiter=1)
      _ = lsq_linear(A, b, lsq_solver="lsmr", lsmr_maxiter=None)
  
      # Should raise error with 0 or negative max iter
      err_message = "`lsmr_maxiter` must be None or positive integer."
      with pytest.raises(ValueError, match=err_message):
          _ = lsq_linear(A, b, lsq_solver="lsmr", lsmr_maxiter=0)
      with pytest.raises(ValueError, match=err_message):
          _ = lsq_linear(A, b, lsq_solver="lsmr", lsmr_maxiter=-1)
  
imports: import pytest
  import numpy
  from numpy.linalg import lstsq
  from numpy.testing import assert_allclose, assert_equal, assert_
  from scipy.sparse import rand, coo_matrix
  from scipy.sparse.linalg import aslinearoperator
  from scipy.optimize import lsq_linear
  from scipy.optimize._minimize import Bounds
label_desc: Use image node_id 2 for calling the TestErrorChecking obj's underlying member method code with example usage: obj.test_option_lsmr_maxiter() without return types