fix(vitest): allow testing unandled rejection/exception

[sheremet-va]

Description

Fixes #5796

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• Ideally, include a test that fails without this PR but passes with it.
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Tests

• Run the tests with pnpm test:ci.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

[longzheng]

Just in case anyone else comes across this looking for an example of how to test for an unhandled rejection or exception, some examples from the test file

test('can test unhandled rejection', async () => {
  const fn = vi.fn()

  const promise = new Promise<void>((resolve) => {
    process.on('unhandledRejection', () => {
      fn()
      resolve()
    })
  })

  Promise.resolve().then(() => {
    throw new Error('unhandled rejection')
  })

  await promise

  expect(fn).toHaveBeenCalledTimes(1)
})

test('can test unhandled exception', async () => {
  const fn = vi.fn()

  const promise = new Promise<void>((resolve) => {
    process.on('uncaughtException', () => {
      fn()
      resolve()
    })
  })

  nextTick(() => {
    throw new Error('unhandled exception')
  })

  await promise

  expect(fn).toHaveBeenCalledTimes(1)
})