Rx\Functional\Operator\SumTest::sum_number_never PHP Method

    public function sum_number_never()
    {
        $xs = $this->createHotObservable([onNext(150, 1)]);
        $results = $this->scheduler->startWithCreate(function () use($xs) {
            return $xs->sum();
        });
        $this->assertMessages([], $results->getMessages());
    }