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Issue #22274: Redirect stderr=STDOUT when stdout not redirected, by Akira Li

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This commit is contained in:
Martin Panter 2016-05-13 01:54:44 +00:00
parent 07451ddd4f
commit c76358924f
3 changed files with 28 additions and 1 deletions
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21
Lib/test/test_subprocess.py
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@ -504,6 +504,27 @@ class ProcessTestCase(BaseTestCase):
tf.seek(0)
self.assertStderrEqual(tf.read(), b"strawberry")
def test_stderr_redirect_with_no_stdout_redirect(self):
# test stderr=STDOUT while stdout=None (not set)
# - grandchild prints to stderr
# - child redirects grandchild's stderr to its stdout
# - the parent should get grandchild's stderr in child's stdout
p = subprocess.Popen([sys.executable, "-c",
'import sys, subprocess;'
'rc = subprocess.call([sys.executable, "-c",'
' "import sys;"'
' "sys.stderr.write(\'42\')"],'
' stderr=subprocess.STDOUT);'
'sys.exit(rc)'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
#NOTE: stdout should get stderr from grandchild
self.assertStderrEqual(stdout, b'42')
self.assertStderrEqual(stderr, b'') # should be empty
self.assertEqual(p.returncode, 0)
def test_stdout_stderr_pipe(self):
# capture stdout and stderr to the same pipe
p = subprocess.Popen([sys.executable, "-c",