Rx\Subject\BehaviorSubjectTest::it_returns_true_if_an_observer_is_removed PHP Method

    public function it_returns_true_if_an_observer_is_removed()
    {
        $subject = new BehaviorSubject();
        $observer = $this->createMock('Rx\\ObserverInterface');
        $subject->subscribe($observer);
        $this->assertTrue($subject->hasObservers());
        $this->assertTrue($subject->removeObserver($observer));
        $this->assertFalse($subject->hasObservers());
    }