Rx\Functional\Operator\ConcatMapTest::concatMapTo_Then_Complete_Never PHP Method

    public function concatMapTo_Then_Complete_Never()
    {
        $xs = $this->createColdObservable([onNext(100, 4), onNext(200, 2), onNext(300, 3), onNext(400, 1), onCompleted(500)]);
        $ys = $this->createColdObservable([onNext(50, 'foo'), onNext(100, 'bar'), onNext(150, 'baz'), onNext(200, 'qux')]);
        $results = $this->scheduler->startWithCreate(function () use($xs, $ys) {
            return $xs->concatMapTo($ys);
        });
        $this->assertMessages([onNext(350, 'foo'), onNext(400, 'bar'), onNext(450, 'baz'), onNext(500, 'qux')], $results->getMessages());
        $this->assertSubscriptions([subscribe(200, 700)], $xs->getSubscriptions());
        $this->assertSubscriptions([subscribe(300, 1000)], $ys->getSubscriptions());
    }