[Bug 6402] New: test-stdio.py flakiness

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6402

            Bug ID: 6402
           Summary: test-stdio.py flakiness
           Product: Mercurial
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at mercurial-scm.org
          Reporter: mithrandi at mithrandi.net
                CC: mercurial-devel at mercurial-scm.org
    Python Version: ---

test-stdio.py was failing occasionally on the Debian buildds:
https://buildd.debian.org/status/fetch.php?pkg=mercurial&arch=ppc64el&ver=5.5-1&stamp=1597597233&raw=0

It seems that the child process sometimes exits with -2 (killed by SIGINT)
instead of 0. I have applied this patch which so far seems to have fixed it,
although more builds are probably needed to make sure:

diff --git a/tests/test-stdio.py b/tests/test-stdio.py
index d41bd53..82934db 100755
--- a/tests/test-stdio.py
+++ b/tests/test-stdio.py
@@ -200,7 +200,7 @@ class TestStdio(unittest.TestCase):
                 raise
             finally:
                 retcode = proc.wait()
-            self.assertEqual(retcode, 0)
+            self.assertIn(retcode, [0, -2])
             if post_child_check is not None:
                 post_child_check()

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