Metabor\Observer\SubjectTest::testObserverCanBeAttachedAndDetach PHP Метод

    public function testObserverCanBeAttachedAndDetach()
    {
        $subject = new Subject();
        $observerA = $this->getMockForAbstractClass('\\SplObserver');
        $subject->attach($observerA);
        $observerB = $this->getMockForAbstractClass('\\SplObserver');
        $subject->attach($observerB);
        $subject->detach($observerB);
        $this->assertContains($observerA, $subject->getObservers());
        $this->assertNotContains($observerB, $subject->getObservers());
    }