code: def test_astype_empty(self, xp, src_dtype, dst_dtype, order):
      a = testing.shaped_arange((2, 0, 4), xp, src_dtype)
      return astype_without_warning(a, dst_dtype, order=order)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy import _util
label_desc: Use image node_id 2 for calling the TestArrayAsType obj's underlying member method code with example usage: obj.test_astype_empty(xp, src_dtype, dst_dtype, order) and returns: astype_without_warning