test/parallel/test-unhandled-exception-with-worker-inuse.js

'use strict';
const common = require('../common');

// https://github.com/nodejs/node/issues/45421
//
// Check that node will NOT call v8::Isolate::SetIdle() when exiting
// due to an unhandled exception, otherwise the assertion(enabled in
// debug build only) in the SetIdle(), which checks that the vm state
// is either EXTERNAL or IDLE will fail.
//
// The root cause of this issue is that before PerIsolateMessageListener()
// is invoked by v8, v8 preserves the JS vm state, although it should
// switch to EXTERNEL. https://bugs.chromium.org/p/v8/issues/detail?id=13464
//
// Therefore, this commit can be considered as an workaround of the v8 bug,
// but we also find it not useful to call SetIdle() when terminating.

if (process.argv[2] === 'child') {
  const { Worker } = require('worker_threads');
  new Worker('', { eval: true });
  throw new Error('xxx');
} else {
  const assert = require('assert');
  const { spawnSync } = require('child_process');
  const result = spawnSync(process.execPath, [__filename, 'child']);

  const stderr = result.stderr.toString().trim();
  // Expect error message to be preserved
  assert.match(stderr, /xxx/);
  // Expect no crash
  assert(!common.nodeProcessAborted(result.status, result.signal), stderr);
}