Issue #25118: Fix a regression of Python 3.5.0 in os.waitpid() on Windows.

Add an unit test on os.waitpid()

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 245309ec05..bb717cc661 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -2078,6 +2078,12 @@ class PidTests(unittest.TestCase):
         # We are the parent of our subprocess
         self.assertEqual(int(stdout), os.getpid())
 
+    def test_waitpid(self):
+        args = [sys.executable, '-c', 'pass']
+        pid = os.spawnv(os.P_NOWAIT, args[0], args)
+        status = os.waitpid(pid, 0)
+        self.assertEqual(status, (pid, 0))
+
 
 # The introduction of this TestCase caused at least two different errors on
 # *nix buildbots. Temporarily skip this to let the buildbots move along.