Rx\Functional\Operator\DistinctTest::distinct_CustomKey_some_duplicates PHP Method

    public function distinct_CustomKey_some_duplicates()
    {
        $xs = $this->createHotObservable([onNext(280, ['id' => 4]), onNext(300, ['id' => 2]), onNext(350, ['id' => 4]), onNext(380, ['id' => 3]), onNext(400, ['id' => 3]), onCompleted(420)]);
        $results = $this->scheduler->startWithCreate(function () use($xs) {
            return $xs->distinctKey(function ($x) {
                return $x['id'];
            })->map(function ($x) {
                return $x['id'];
            });
        });
        $this->assertMessages([onNext(280, 4), onNext(300, 2), onNext(380, 3), onCompleted(420)], $results->getMessages());
        $this->assertSubscriptions([subscribe(200, 420)], $xs->getSubscriptions());
    }