test/parallel/test-child-process-exec-error.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
const common = require('../common');
const assert = require('assert');
const child_process = require('child_process');

function test(fn, code, expectPidType = 'number') {
  const child = fn('does-not-exist', common.mustCall(function(err) {
    assert.strictEqual(err.code, code);
    assert(err.cmd.includes('does-not-exist'));
  }));

  assert.strictEqual(typeof child.pid, expectPidType);
}

// With `shell: true`, expect pid (of the shell)
if (common.isWindows) {
  test(child_process.exec, 1, 'number'); // Exit code of cmd.exe
} else {
  test(child_process.exec, 127, 'number'); // Exit code of /bin/sh
}

// With `shell: false`, expect no pid
test(child_process.execFile, 'ENOENT', 'undefined');