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ant/tests/test_tty_readstream_dev_tty_on_data_flowing.cjs
201d063fe28amaster

test_tty_readstream_dev_tty_on_data_flowing.cjs
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			const { spawnSync } = require('child_process');
			const path = require('path');

			function fail(message) {
			throw new Error(message);
			}

			function runInPty() {
			const helper = path.join(__dirname, 'fixtures', 'tty_readstream_dev_tty_on_data_flowing_child.cjs');
			const script = `
			import os, select, signal, sys, time

			exec_path, helper = sys.argv[1], sys.argv[2]
			pid, master = os.forkpty()

			if pid == 0:
			os.execv(exec_path, [exec_path, helper])

			buf = bytearray()
			sent = False
			exit_code = None
			deadline = time.time() + 7.0

			while time.time() < deadline:
			done, status = os.waitpid(pid, os.WNOHANG)
			if done == pid:
			exit_code = os.waitstatus_to_exitcode(status)
			break

			r, _, _ = select.select([master], [], [], 0.1)
			if master not in r:
			continue

			try:
			chunk = os.read(master, 4096)
			except OSError:
			break

			if not chunk:
			break

			buf.extend(chunk)
			if (not sent) and b'READY' in buf:
			os.write(master, b'probe\\n')
			sent = True

			if exit_code is None:
			os.kill(pid, signal.SIGKILL)
			_, status = os.waitpid(pid, 0)
			exit_code = os.waitstatus_to_exitcode(status)

			while True:
			r, _, _ = select.select([master], [], [], 0.05)
			if master not in r:
			break
			try:
			chunk = os.read(master, 4096)
			except OSError:
			break
			if not chunk:
			break
			buf.extend(chunk)

			sys.stdout.buffer.write(bytes(buf))
			sys.exit(exit_code)
			`;

			if (process.platform === 'win32') {
			console.log('skipping tty.ReadStream(/dev/tty) flowing listener test on win32');
			process.exit(0);
			}

			return spawnSync('python3', ['-c', script, process.execPath, helper], {
			encoding: 'utf8',
			timeout: 9000,
			});
			}

			const result = runInPty();

			if (result.error && result.error.code === 'ENOENT') {
			console.log('skipping tty.ReadStream(/dev/tty) flowing listener test because `python3` is unavailable');
			process.exit(0);
			}

			if (result.error) throw result.error;

			const output = `${result.stdout \|\| ''}${result.stderr \|\| ''}`;

			if (result.status !== 0) {
			fail(`child exited ${result.status}\n${output}`);
			}

			if (!output.includes('READY')) {
			fail(`expected READY banner\n${output}`);
			}

			if (!output.includes('DATA "probe')) {
			fail(`expected tty data payload without explicit resume()\n${output}`);
			}

			console.log('tty.ReadStream(/dev/tty) starts flowing on data listener');

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