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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;
const execDoneP = 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;
const execFailDoneP = 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;
});
const childClosedP = new Promise(resolve => 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);
resolve();
}));
const shellChildDoneP = childClosedP.then(() => new Promise(resolve => {
const shellChild = spawn('echo $HOME', [], { shell: true });
shellChild.on('close', () => {
test('spawn with shell option', shellChild.stdout.length > 0, true);
resolve();
});
}));
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);
Promise.all([execDoneP, execFailDoneP, shellChildDoneP]).then(() => {
test('exec async completed', execDone, true);
test('exec fail async completed', execFailDone, true);
summary();
});

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