Issue #20532: Tests which use _testcapi now are marked as CPython only.

1 files changed, 12 insertions, 3 deletions

diff --git a/Lib/test/test_devpoll.py b/Lib/test/test_devpoll.py
index 819d9dc883..9129ac0cb1 100644
--- a/Lib/test/test_devpoll.py
+++ b/Lib/test/test_devpoll.py
@@ -3,8 +3,7 @@
 # Initial tests are copied as is from "test_poll.py"
 
 import os, select, random, unittest, sys
-from test.support import TESTFN, run_unittest
-from _testcapi import USHRT_MAX
+from test.support import TESTFN, run_unittest, cpython_only
 
 try:
     select.devpoll
@@ -94,8 +93,18 @@ class DevPollTests(unittest.TestCase):
         pollster.register(w)
         # Issue #17919
         self.assertRaises(OverflowError, pollster.register, 0, -1)
-        self.assertRaises(OverflowError, pollster.register, 0, USHRT_MAX + 1)
+        self.assertRaises(OverflowError, pollster.register, 0, 1 << 64)
         self.assertRaises(OverflowError, pollster.modify, 1, -1)
+        self.assertRaises(OverflowError, pollster.modify, 1, 1 << 64)
+
+    @cpython_only
+    def test_events_mask_overflow_c_limits(self):
+        from _testcapi import USHRT_MAX
+        pollster = select.devpoll()
+        w, r = os.pipe()
+        pollster.register(w)
+        # Issue #17919
+        self.assertRaises(OverflowError, pollster.register, 0, USHRT_MAX + 1)
         self.assertRaises(OverflowError, pollster.modify, 1, USHRT_MAX + 1)