Rx\Functional\Operator\ConcatTest::testConcatEmptyEmpty PHP Method

    public function testConcatEmptyEmpty()
    {
        $e1 = $this->createHotObservable([onNext(150, 1), onCompleted(230)]);
        $e2 = $this->createHotObservable([onNext(150, 1), onCompleted(250)]);
        $results = $this->scheduler->startWithCreate(function () use($e1, $e2) {
            return $e1->concat($e2);
        });
        $this->assertMessages([onCompleted(250)], $results->getMessages());
    }