Create New Order from Locations Test

Create a test in MyStore.Store.Tests to check that the CreateNewOrder method in the MyStore.Store Location creates a new order.

Also, test that an ItemNotFoundException is thrown if an order for an item, using the name of an item that doesn't exist is created.

尋找 MyStore.Store.Tests 專案以及包含 CreateNewOrder 方法的 Location 類別。撰寫一個呼叫 CreateNewOrder 並驗證新訂單已建立的測試。然後撰寫一個嘗試使用不存在的項目名稱建立訂單，並斷言會擲出 ItemNotFoundException 的測試。執行測試套件以確保測試通過。

由索引模型根據 Issue 內容生成。