public function test_subscribe_and_unsubscribe()
{
$eventer = new Eventer();
$eventer->subscribe('foo', 'foo');
$subscription = $eventer->subscribe('foo', 'bar');
$eventer->subscribe('foo', 'baz');
$this->assertTrue($subscription instanceof IEventSubscription);
$this->assertEquals(3, count($eventer->getSubscriptions()));
$this->assertEquals('foo', $eventer->getSubscriptions()[0]->getSubscriber());
$this->assertEquals('bar', $eventer->getSubscriptions()[1]->getSubscriber());
$this->assertEquals('baz', $eventer->getSubscriptions()[2]->getSubscriber());
$this->assertTrue($eventer->getSubscriptions()[0]->getId() != $eventer->getSubscriptions()[1]->getId());
$this->assertTrue($eventer->getSubscriptions()[0]->getId() != $eventer->getSubscriptions()[2]->getId());
$this->assertTrue($eventer->getSubscriptions()[1]->getId() != $eventer->getSubscriptions()[2]->getId());
$eventer->unsubscribe($subscription);
$this->assertEquals(3, count($eventer->getSubscriptions()));
$this->assertNull($eventer->getSubscriptions()[1]);
}
