code: def test_column_stack(self, xp, dtype1, dtype2):
      a = testing.shaped_arange((4, 3), xp, dtype1)
      b = testing.shaped_arange((4,), xp, dtype2)
      c = testing.shaped_arange((4, 2), xp, dtype1)
      return xp.column_stack((a, b, c))
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy import cuda
label_desc: Use image node_id 1 for calling the TestJoin obj's underlying member method code with example usage: obj.test_column_stack(xp, dtype1, dtype2) and returns: xp