code: def test_vstack_wrong_ndim(self):
      a = cupy.empty((3,))
      b = cupy.empty((3, 1))
      with pytest.raises(ValueError):
          cupy.vstack((a, b))
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy import cuda
label_desc: Use image node_id 40 for calling the TestJoin obj's underlying member method code with example usage: obj.test_vstack_wrong_ndim() without return types