Function test

test/parallel/test-inspector-port-zero.js:9–41

(arg, port = '')

const { spawn } = require('child_process');

function test(arg, port = '') {
  const args = [arg, '-p', 'process.debugPort'];
  const proc = spawn(process.execPath, args);
  proc.stdout.setEncoding('utf8');
  proc.stderr.setEncoding('utf8');
  let stdout = '';
  let stderr = '';
  proc.stdout.on('data', (data) => stdout += data);
  proc.stderr.on('data', (data) => stderr += data);
  proc.stdout.on('close', mustCall((hadErr) => assert(!hadErr)));
  proc.stderr.on('close', mustCall((hadErr) => assert(!hadErr)));
  proc.stderr.on('data', mustCallAtLeast(() => {
    if (!stderr.includes('\n')) return;
    assert.match(stderr, /Debugger listening on (.+)/);
    port = new URL(RegExp.$1).port;
    assert(+port > 0);
  }, 0));
  if (/inspect-brk/.test(arg)) {
    proc.stderr.on('data', () => {
      if (stderr.includes('\n') && !proc.killed) proc.kill();
    });
  } else {
    let onclose = mustCall(() => {
      onclose = mustCall(() => assert.strictEqual(port, stdout.trim()));
    });
    proc.stdout.on('close', () => onclose());
    proc.stderr.on('close', () => onclose());
    proc.on('exit', mustCall((exitCode, signal) => assert.strictEqual(
      exitCode,
      0,
      `exitCode: ${exitCode}, signal: ${signal}`)));
  }
}

test('--inspect=0');
test('--inspect=127.0.0.1:0');