Issue #12400: fix test_faulthandler if regrtest captures sys.stderr
faulthandler.enable() requires that sys.stderr has a fileno() method.
diff --git a/Lib/test/test_faulthandler.py b/Lib/test/test_faulthandler.py
index 0ddfc7f..291fac5 100644
--- a/Lib/test/test_faulthandler.py
+++ b/Lib/test/test_faulthandler.py
@@ -1,6 +1,7 @@
from contextlib import contextmanager
import datetime
import faulthandler
+import os
import re
import signal
import subprocess
@@ -230,17 +231,30 @@
self.assertNotEqual(exitcode, 0)
def test_is_enabled(self):
- was_enabled = faulthandler.is_enabled()
+ null_stderr = None
+ orig_stderr = sys.stderr
try:
- faulthandler.enable()
- self.assertTrue(faulthandler.is_enabled())
- faulthandler.disable()
- self.assertFalse(faulthandler.is_enabled())
- finally:
- if was_enabled:
+ # regrtest may replace sys.stderr by io.StringIO object, but
+ # faulthandler.enable() requires that sys.stderr has a fileno()
+ # method
+ null_stderr = open(os.devnull, 'w')
+ sys.stderr = null_stderr
+
+ was_enabled = faulthandler.is_enabled()
+ try:
faulthandler.enable()
- else:
+ self.assertTrue(faulthandler.is_enabled())
faulthandler.disable()
+ self.assertFalse(faulthandler.is_enabled())
+ finally:
+ if was_enabled:
+ faulthandler.enable()
+ else:
+ faulthandler.disable()
+ finally:
+ sys.stderr = orig_stderr
+ if null_stderr is not None:
+ null_stderr.close()
def check_dump_traceback(self, filename):
"""