Method test_stderr

python/python3/tornado/test/process_test.py:188–199

(self)

    @gen_test
    def test_stderr(self):
        # This test is mysteriously flaky on twisted: it succeeds, but logs
        # an error of EBADF on closing a file descriptor.
        subproc = Subprocess(
            [sys.executable, "-u", "-c", r"import sys; sys.stderr.write('hello\n')"],
            stderr=Subprocess.STREAM,
        )
        self.addCleanup(lambda: self.term_and_wait(subproc))
        data = yield subproc.stderr.read_until(b"\n")
        self.assertEqual(data, b"hello\n")
        # More mysterious EBADF: This fails if done with self.addCleanup instead of here.
        subproc.stderr.close()

    def test_sigchild(self):
        Subprocess.initialize()