public function testRemoveItem()
{
$order = new Order();
$orderItems = $order->getOrderItems();
$orderItem = new OrderItem();
$orderItem->setSubtotal(10);
$orderItems->add($orderItem);
$orderItem = new OrderItem();
$orderItem->setSubtotal(60);
$orderItems->add($orderItem);
$orderItem = new OrderItem();
$orderItem->setSubtotal(80);
$orderItems->add($orderItem);
$order->removeOrderItem(2);
$order->updateOrderTotal();
$this->assertEquals(2, count($order->getOrderItems()));
$this->assertEquals(76.5, $order->getAmountPaid());
}