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ant/examples/spec/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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