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

    public function sum_number_some()
    {
        $xs = $this->createHotObservable([onNext(150, 1), onNext(210, 2), onNext(220, 3), onNext(230, 4), onCompleted(250)]);
        $results = $this->scheduler->startWithCreate(function () use($xs) {
            return $xs->sum();
        });
        $this->assertMessages([onNext(250, 2 + 3 + 4), onCompleted(250)], $results->getMessages());
    }