Issue #21310: Fixed possible resource leak in failed open().
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 936dbed..af3b90a 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -29,6 +29,7 @@
import random
import unittest
import weakref
+import warnings
import abc
import signal
import errno
@@ -603,6 +604,20 @@
fileio.close()
f2.readline()
+ def test_nonbuffered_textio(self):
+ with warnings.catch_warnings(record=True) as recorded:
+ with self.assertRaises(ValueError):
+ self.open(support.TESTFN, 'w', buffering=0)
+ support.gc_collect()
+ self.assertEqual(recorded, [])
+
+ def test_invalid_newline(self):
+ with warnings.catch_warnings(record=True) as recorded:
+ with self.assertRaises(ValueError):
+ self.open(support.TESTFN, 'w', newline='invalid')
+ support.gc_collect()
+ self.assertEqual(recorded, [])
+
class CIOTest(IOTest):