code: def test_ravel3(self, xp, order):
      a = testing.shaped_arange((2, 3, 4), xp)
      a = xp.asfortranarray(a)
      return a.ravel(order)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 3 for calling the TestRavel obj's underlying member method code with example usage: obj.test_ravel3(xp, order) and returns: a