code: def test_vsplit(self, xp):
      a = testing.shaped_arange((12, 3), xp)
      return xp.vsplit(a, 4)
  
imports: import unittest
  from cupy import testing
label_desc: Use image node_id 18 for calling the TestSplit obj's underlying member method code with example usage: obj.test_vsplit(xp) and returns: xp