code: def test_writeability(self):
      # See gh-7269
      x, y = np.unravel_index([1, 2, 3], (4, 5))
      assert_(x.flags.writeable)
      assert_(y.flags.writeable)
  
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 6 for calling the TestRavelUnravelIndex obj's underlying member method code with example usage: obj.test_writeability() without return types