code: def test_simple_cancast(self, from_Dt):
      for to_Dt in simple_dtypes:
          cast = get_castingimpl(from_Dt, to_Dt)
  
          for from_dt in [from_Dt(), from_Dt().newbyteorder()]:
              default = cast._resolve_descriptors((from_dt, None))[1][1]
              assert default == to_Dt()
              del default
  
              for to_dt in [to_Dt(), to_Dt().newbyteorder()]:
                  (
                      casting,
                      (from_res, to_res),
                      view_off,
                  ) = cast._resolve_descriptors((from_dt, to_dt))
                  assert type(from_res) == from_Dt
                  assert type(to_res) == to_Dt
                  if view_off is not None:
                      # If a view is acceptable, this is "no" casting
                      # and byte order must be matching.
                      assert casting == Casting.no
                      # The above table lists this as "equivalent"
                      assert Casting.equiv == CAST_TABLE[from_Dt][to_Dt]
                      # Note that to_res may not be the same as from_dt
                      assert from_res.isnative == to_res.isnative
                  else:
                      if from_Dt == to_Dt:
                          # Note that to_res may not be the same as from_dt
                          assert from_res.isnative != to_res.isnative
                      assert casting == CAST_TABLE[from_Dt][to_Dt]
  
                  if from_Dt is to_Dt:
                      assert from_dt is from_res
                      assert to_dt is to_res
  
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 3 for calling the TestCasting obj's underlying member method code with example usage: obj.test_simple_cancast(from_Dt) without return types