class_docstr: These test cases exercise some behaviour changes
code: def test_to_void(self):
      # But in general, we do consider these safe:
      assert np.can_cast("d", "V")
      assert np.can_cast("S20", "V")
  
      # Do not consider it a safe cast if the void is too smaller:
      assert not np.can_cast("d", "V1")
      assert not np.can_cast("S20", "V1")
      assert not np.can_cast("U1", "V1")
      # Structured to unstructured is just like any other:
      assert np.can_cast("d,i", "V", casting="same_kind")
      # Unstructured void to unstructured is actually no cast at all:
      assert np.can_cast("V3", "V", casting="no")
      assert np.can_cast("V0", "V", casting="no")
  
imports: import pytest
  import textwrap
  import enum
  import random
  import ctypes
  import numpy
  from numpy.lib.stride_tricks import as_strided
  from numpy.testing import assert_array_equal
  from numpy._core._multiarray_umath import _get_castingimpl
label_desc: Use image node_id 2 for calling the TestChanges obj's underlying member method code with example usage: obj.test_to_void() without return types