code: def test_complex_step(self):
      # Regression test for #12262
      g = r_[0:36:100j]
      assert_(g.shape == (100,))
  
      # Related to #16466
      g = r_[0 : 36 : np.complex64(100j)]
      assert_(g.shape == (100,))
  
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 4 for calling the TestConcatenator obj's underlying member method code with example usage: obj.test_complex_step() without return types