public function materialize_dematerialize_throw()
{
$error = new \Exception();
$xs = $this->createHotObservable([onNext(150, 1), onError(250, $error)]);
$results = $this->scheduler->startWithCreate(function () use($xs) {
return $xs->materialize()->dematerialize();
});
$this->assertMessages([onError(250, $error)], $results->getMessages());
}