Check that a ctypes struct/union matches its C equivalent. ... 
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i8', value=-1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i8', value=1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i8', value=0, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='u8', value=-1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='u8', value=1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='u8', value=0, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i16', value=-1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i16', value=1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i16', value=0, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='u16', value=-1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='u16', value=1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='u16', value=0, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i32', value=-1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i32', value=1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i32', value=0, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='u32', value=-1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='u32', value=1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL
  test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='u32', value=0, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent. ... FAIL

Example output:

FAIL: test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (field='i8', value=-1, name='ManyTypesU')
Check that a ctypes struct/union matches its C equivalent.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/python3.14-3.14.0_a4-build/Python-3.14.0a4/Lib/test/test_ctypes/test_generated_structs.py", line 473, in test_generated_data
    self.assertEqual(py_mem.hex(), c_mem.hex(), m)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 'ff00000000000000' != 'ff8f8783ffff0000'
- ff00000000000000
+ ff8f8783ffff0000
 : <FieldInfo for ManyTypesU.i8: <Field type=c_int8, ofs=0, size=1>>
in:
union {
    int8_t i8;
    uint8_t u8;
    int16_t i16;
    uint16_t u16;
    int32_t i32;
    uint32_t u32;
    int64_t i64;
    uint64_t u64;
}

Ran 1 test in 0.178s
FAILED (failures=18, skipped=11)