test_child_process_exec_promisify.cjs
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test_child_process_exec_promisify.cjs
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	const { promisify } = require('util');
	const { exec } = require('child_process');

	async function main() {
	if (typeof promisify.custom !== 'symbol') {
	throw new Error('expected util.promisify.custom to be a symbol');
	}

	if (typeof exec[promisify.custom] !== 'function') {
	throw new Error('expected exec to define util.promisify.custom');
	}

	const execAsync = promisify(exec);
	const result = await execAsync('printf "OUT"; printf "ERR" >&2');

	if (!result \|\| typeof result !== 'object' \|\| Array.isArray(result)) {
	throw new Error(`expected object result, got ${Object.prototype.toString.call(result)}`);
	}

	if (result.stdout !== 'OUT') {
	throw new Error(`expected stdout to be OUT, got ${JSON.stringify(result.stdout)}`);
	}

	if (result.stderr !== 'ERR') {
	throw new Error(`expected stderr to be ERR, got ${JSON.stringify(result.stderr)}`);
	}

	console.log('util.promisify(exec) resolves { stdout, stderr }');
	}

	main().catch((err) => {
	console.error(err && err.stack ? err.stack : String(err));
	process.exit(1);
	});

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