code: def test_byte(self):
      ts = self.ts
      ts.T_BYTE = CHAR_MAX
      self.assertEqual(ts.T_BYTE, CHAR_MAX)
      ts.T_BYTE = CHAR_MIN
      self.assertEqual(ts.T_BYTE, CHAR_MIN)
      ts.T_UBYTE = UCHAR_MAX
      self.assertEqual(ts.T_UBYTE, UCHAR_MAX)
  
imports: import unittest
  from test.support import import_helper
  from test.support import warnings_helper
  from _testcapi import _test_structmembersType_OldAPI, _test_structmembersType_NewAPI, CHAR_MAX, CHAR_MIN, UCHAR_MAX, SHRT_MAX, SHRT_MIN, USHRT_MAX, INT_MAX, INT_MIN, UINT_MAX, LONG_MAX, LONG_MIN, ULONG_MAX, LLONG_MAX, LLONG_MIN, ULLONG_MAX, PY_SSIZE_T_MAX, PY_SSIZE_T_MIN
label_desc: Use image node_id 3 for calling the ReadWriteTests obj's underlying member method code with example usage: obj.test_byte() without return types