code: def test_simple_1(self):
      a = np.random.rand(4, 5, 6)
  
      assert_equal(a[:, :3, [1, 2]], a[index_exp[:, :3, [1, 2]]])
      assert_equal(a[:, :3, [1, 2]], a[s_[:, :3, [1, 2]]])
  
imports: import pytest
  import numpy
  from numpy.testing import assert_, assert_equal, assert_array_equal, assert_almost_equal, assert_array_almost_equal, assert_raises, assert_raises_regex
  from numpy.lib.index_tricks import mgrid, ogrid, ndenumerate, fill_diagonal, diag_indices, diag_indices_from, index_exp, ndindex, r_, s_, ix_
label_desc: Use image node_id 2 for calling the TestIndexExpression obj's underlying member method code with example usage: obj.test_simple_1() without return types