Method run_subproc

python/python3/tornado/test/tcpserver_test.py:126–139

(self, code: str)

    # byte, so we don't have to worry about atomicity of the shared
    # stdout stream) and then exits.
    def run_subproc(self, code: str) -> Tuple[str, str]:
        try:
            result = subprocess.run(
                [sys.executable, "-Werror::DeprecationWarning"],
                capture_output=True,
                input=code,
                encoding="utf8",
                check=True,
            )
        except subprocess.CalledProcessError as e:
            raise RuntimeError(
                f"Process returned {e.returncode} stdout={e.stdout} stderr={e.stderr}"
            ) from e
        return result.stdout, result.stderr

    def test_listen_single(self):
        # As a sanity check, run the single-process version through this test