node/test/parallel/test-child-process-fork-and-spawn.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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'use strict';
const common = require('../common');
const assert = require('assert');
const { fork, spawn } = require('child_process');

// Fork, then spawn. The spawned process should not hang.
switch (process.argv[2] || '') {
  case '':
    fork(__filename, ['fork']).on('exit', common.mustCall(checkExit));
    break;
  case 'fork':
    spawn(process.execPath, [__filename, 'spawn'])
      .on('exit', common.mustCall(checkExit));
    break;
  case 'spawn':
    break;
  default:
    assert.fail();
}

function checkExit(statusCode) {
  assert.strictEqual(statusCode, 0);
}