child_process.js
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child_process.js
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	import { test, testThrows, summary } from './helpers.js';
	import { spawn, exec, execSync, spawnSync } from 'child_process';

	console.log('Child Process Tests\n');

	test('execSync returns stdout', execSync('echo hello').trim(), 'hello');
	test('execSync with spaces', execSync('echo "hello world"').trim(), 'hello world');
	test('execSync exit code 0', typeof execSync('true'), 'string');

	testThrows('execSync throws on non-zero exit', () => {
	execSync('exit 1');
	});

	const syncResult = spawnSync('echo', ['hello', 'world']);
	test('spawnSync stdout', syncResult.stdout.trim(), 'hello world');
	test('spawnSync status 0', syncResult.status, 0);
	test('spawnSync signal null', syncResult.signal, null);
	test('spawnSync has pid', syncResult.pid > 0, true);

	const failSync = spawnSync('sh', ['-c', 'exit 42']);
	test('spawnSync non-zero status', failSync.status, 42);

	const stderrSync = spawnSync('sh', ['-c', 'echo error >&2']);
	test('spawnSync captures stderr', stderrSync.stderr.trim(), 'error');

	const inputSync = spawnSync('cat', [], { input: 'test input' });
	test('spawnSync with input', inputSync.stdout, 'test input');

	let execDone = false;
	exec('echo async').then(result => {
	test('exec resolves with stdout', result.stdout.trim(), 'async');
	test('exec exitCode', result.exitCode, 0);
	execDone = true;
	});

	let execFailDone = false;
	exec('exit 1').catch(err => {
	test('exec rejects on non-zero exit', typeof err, 'string');
	execFailDone = true;
	});

	let spawnStdout = '';
	let spawnExitCode = null;
	let spawnClosed = false;

	const child = spawn('sh', ['-c', 'echo line1; echo line2']);

	test('spawn returns object', typeof child, 'object');
	test('spawn has pid', child.pid > 0, true);
	test('spawn has on method', typeof child.on, 'function');
	test('spawn has once method', typeof child.once, 'function');
	test('spawn has kill method', typeof child.kill, 'function');

	child.on('stdout', data => {
	spawnStdout += data;
	});

	child.on('exit', code => {
	spawnExitCode = code;
	});

	child.on('close', () => {
	spawnClosed = true;
	test('spawn collects stdout', spawnStdout.trim(), 'line1\nline2');
	test('spawn exit code', spawnExitCode, 0);
	test('spawn close event fired', spawnClosed, true);

	const shellChild = spawn('echo $HOME', [], { shell: true });
	shellChild.on('close', () => {
	test('spawn with shell option', shellChild.stdout.length > 0, true);

	setTimeout(() => {
	test('exec async completed', execDone, true);
	test('exec fail async completed', execFailDone, true);
	summary();
	}, 100);
	});
	});

	const stderrChild = spawn('sh', ['-c', 'echo err >&2']);
	let stderrData = '';
	stderrChild.on('stderr', data => {
	stderrData += data;
	});
	stderrChild.on('close', () => {
	test('spawn captures stderr', stderrData.trim(), 'err');
	});

	const longChild = spawn('sleep', ['10']);
	longChild.on('close', () => {});
	const killResult = longChild.kill('SIGTERM');
	test('spawn kill returns true', killResult, true);

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