assertCount(0, $order->getOrderItems()); $order->addOrderItem($orderItem); $order->addOrderItem($orderItem); $this->assertCount(1, $order->getOrderItems()); $this->assertSame($order, $orderItem->getFoodOrder()); $order->removeOrderItem($orderItem); $this->assertCount(0, $order->getOrderItems()); $this->assertNull($orderItem->getFoodOrder()); } }