code: def test_shape_and_dtype(self):
      sizes = (4, 5, 3, 2)
      # Test both lists and arrays
      for func in (range, np.arange):
          arrays = np.ix_(*[func(sz) for sz in sizes])
          for k, (a, sz) in enumerate(zip(arrays, sizes)):
              assert_equal(a.shape[k], sz)
              assert_(
                  all(sh == 1 for j, sh in enumerate(a.shape) if j != k)
              )
              assert_(np.issubdtype(a.dtype, np.integer))
  
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 TestIx_ obj's underlying member method code with example usage: obj.test_shape_and_dtype() without return types