code: def test_dsplit(self, xp):
      a = testing.shaped_arange((3, 3, 12), xp)
      return xp.dsplit(a, 4)
  
imports: import unittest
  from cupy import testing
label_desc: Use image node_id 9 for calling the TestSplit obj's underlying member method code with example usage: obj.test_dsplit(xp) and returns: xp