code: def test_empty_array_unravel(self):
      res = np.unravel_index(np.zeros(0, dtype=np.intp), (2, 1, 0))
      # res is a tuple of three empty arrays
      assert len(res) == 3
      assert all(a.shape == (0,) for a in res)
  
      with assert_raises(ValueError):
          np.unravel_index([1], (2, 1, 0))
  
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 9 for calling the TestRavelUnravelIndex obj's underlying member method code with example usage: obj.test_empty_array_unravel() without return types