Rx\Functional\Operator\AverageTest::average_Number_Empty PHP Метод

    public function average_Number_Empty()
    {
        $xs = $this->createHotObservable([onNext(150, 1), onCompleted(250)]);
        $results = $this->scheduler->startWithCreate(function () use($xs) {
            return $xs->average();
        });
        $this->assertMessages([onError(251, new \UnderflowException())], $results->getMessages());
    }