class_docstr: Test conversion from dtypes to ctypes types 
class_docstr_tok: ["Test","conversion","from","dtypes","to","ctypes","types"]
code: def test_structure_aligned(self):
      dt = np.dtype(
          [
              ("a", np.uint16),
              ("b", np.uint32),
          ],
          align=True,
      )
  
      ct = np.ctypeslib.as_ctypes_type(dt)
      assert_(issubclass(ct, ctypes.Structure))
      assert_equal(ctypes.sizeof(ct), dt.itemsize)
      assert_equal(
          ct._fields_,
          [
              ("a", ctypes.c_uint16),
              ("", ctypes.c_char * 2),  # padding
              ("b", ctypes.c_uint32),
          ],
      )
  
imports: import sys
  import sysconfig
  import weakref
  from pathlib import Path
  import pytest
  import numpy
  from numpy.ctypeslib import ndpointer, load_library, as_array
  from numpy.testing import assert_, assert_array_equal, assert_raises, assert_equal
label_desc: Use image node_id 4 for calling the TestAsCtypesType obj's underlying member method code with example usage: obj.test_structure_aligned() without return types