Rx\Observable\GroupedObservableTest::it_returns_the_disposable_of_the_underlying_disposable PHP Method

    public function it_returns_the_disposable_of_the_underlying_disposable()
    {
        $disposable = $this->createMock('Rx\\DisposableInterface');
        $disposable->expects($this->once())->method('dispose');
        $observable = new AnonymousObservable(function () use(&$disposable) {
            return $disposable;
        });
        $groupedObservable = new GroupedObservable('key', $observable);
        $groupedObservable->subscribe(new CallbackObserver())->dispose();
    }