bpo-45668: Fix PGO tests without test extensions (GH-29315)

1 files changed, 6 insertions, 5 deletions

diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index 089701c..0d4c7ec 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -4,6 +4,7 @@ Common tests shared by test_unicode, test_userstring and test_bytes.
 
 import unittest, string, sys, struct
 from test import support
+from test.support import import_helper
 from collections import UserList
 import random
 
@@ -1328,17 +1329,17 @@ class MixinStrUnicodeUserStringTest:
 
     @support.cpython_only
     def test_formatting_c_limits(self):
-        from _testcapi import PY_SSIZE_T_MAX, INT_MAX, UINT_MAX
-        SIZE_MAX = (1 << (PY_SSIZE_T_MAX.bit_length() + 1)) - 1
+        _testcapi = import_helper.import_module('_testcapi')
+        SIZE_MAX = (1 << (_testcapi.PY_SSIZE_T_MAX.bit_length() + 1)) - 1
         self.checkraises(OverflowError, '%*s', '__mod__',
-                         (PY_SSIZE_T_MAX + 1, ''))
+                         (_testcapi.PY_SSIZE_T_MAX + 1, ''))
         self.checkraises(OverflowError, '%.*f', '__mod__',
-                         (INT_MAX + 1, 1. / 7))
+                         (_testcapi.INT_MAX + 1, 1. / 7))
         # Issue 15989
         self.checkraises(OverflowError, '%*s', '__mod__',
                          (SIZE_MAX + 1, ''))
         self.checkraises(OverflowError, '%.*f', '__mod__',
-                         (UINT_MAX + 1, 1. / 7))
+                         (_testcapi.UINT_MAX + 1, 1. / 7))
 
     def test_floatformatting(self):
         # float formatting