node/test/parallel/test-cluster-uncaught-exception.js

'use strict';
// Installing a custom uncaughtException handler should override the default
// one that the cluster module installs.
// https://github.com/joyent/node/issues/2556

const common = require('../common');
const assert = require('assert');
const cluster = require('cluster');
const fork = require('child_process').fork;

const MAGIC_EXIT_CODE = 42;

const isTestRunner = process.argv[2] !== 'child';

if (isTestRunner) {
  const master = fork(__filename, ['child']);
  master.on('exit', common.mustCall((code) => {
    assert.strictEqual(code, MAGIC_EXIT_CODE);
  }));
} else if (cluster.isMaster) {
  process.on('uncaughtException', common.mustCall(() => {
    process.nextTick(() => process.exit(MAGIC_EXIT_CODE));
  }));
  cluster.fork();
  throw new Error('kill master');
} else { // worker
  process.exit();
}