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

    public function distinct_CustomKey_some_throw()
    {
        $error = new \Exception();
        $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, $error) {
            return $xs->distinctKey(function ($x) use($error) {
                if ($x['id'] === 3) {
                    throw $error;
                }
                return $x['id'];
            })->map(function ($x) {
                return $x['id'];
            });
        });
        $this->assertMessages([onNext(280, 4), onNext(300, 2), onError(380, $error)], $results->getMessages());
        $this->assertSubscriptions([subscribe(200, 380)], $xs->getSubscriptions());
    }