fix: make sure we don't swallow errors inside the mock

[Niryo]

adding {cause} should make it easier to understand where the error comes from.

[d4vidi]

@Niryo the image link is broken

[Niryo]

@d4vidi

try {
  throw new Error('this is the internal error!');
} catch(e) {
  throw new Error('Oops, something went wrong', { cause: e });
}