https://github.com/python/cpython/commit/205ac6eecf4795a9a8411c19385fa06c9d7... commit: 205ac6eecf4795a9a8411c19385fa06c9d763d7a branch: 3.12 author: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> committer: serhiy-storchaka <storchaka@gmail.com> date: 2024-01-27T19:29:48+02:00 summary: [3.12] gh-114100: Remove superfluous writing to fd 1 in test_pty (GH-114647) (GH-114655) (cherry picked from commit 7a470541e2bbc6f3e87a6d813e2ec42cf726de7a) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> files: M Lib/test/test_pty.py diff --git a/Lib/test/test_pty.py b/Lib/test/test_pty.py index f31a68c5d84e03..51e3a46d0df178 100644 --- a/Lib/test/test_pty.py +++ b/Lib/test/test_pty.py @@ -1,4 +1,5 @@ from test.support import verbose, reap_children +from test.support.os_helper import TESTFN, unlink from test.support.import_helper import import_module # Skip these tests if termios or fcntl are not available @@ -292,7 +293,26 @@ def test_master_read(self): self.assertEqual(data, b"") def test_spawn_doesnt_hang(self): - pty.spawn([sys.executable, '-c', 'print("hi there")']) + self.addCleanup(unlink, TESTFN) + with open(TESTFN, 'wb') as f: + STDOUT_FILENO = 1 + dup_stdout = os.dup(STDOUT_FILENO) + os.dup2(f.fileno(), STDOUT_FILENO) + buf = b'' + def master_read(fd): + nonlocal buf + data = os.read(fd, 1024) + buf += data + return data + try: + pty.spawn([sys.executable, '-c', 'print("hi there")'], + master_read) + finally: + os.dup2(dup_stdout, STDOUT_FILENO) + os.close(dup_stdout) + self.assertEqual(buf, b'hi there\r\n') + with open(TESTFN, 'rb') as f: + self.assertEqual(f.read(), b'hi there\r\n') class SmallPtyTests(unittest.TestCase): """These tests don't spawn children or hang."""