code: def test_getitem(self):
      x = pt.dmatrix("x")
      x = sparse.csr_from_dense(x)
  
      z = x[:, :2]
      assert isinstance(z.type, SparseTensorType)
  
      f = pytensor.function([x], z)
      exp_res = f([[1.1, 0.0, 2.0], [-1.0, 0.0, 0.0]])
      assert isinstance(exp_res, csr_matrix)
  
file_path: pytensor/tests/sparse/test_var.py
imports: from contextlib import ExitStack
  import numpy
  import pytest
  from scipy.sparse.csr import csr_matrix
  import pytensor
  import pytensor.sparse
  import pytensor.tensor
  from pytensor.sparse.type import SparseTensorType
  from pytensor.tensor.type import DenseTensorType
label_desc: Use image node_id 5 for calling the TestSparseVariable obj's underlying member method code with example usage: obj.test_getitem() without return types