Implementing the ItemManager class

The to-do app will show all the to-do items in a list. The list of items will be managed by a class called ItemManager. It will expose an interface to get, add, and remove items.

Open Project Navigator and select the ToDoTests group. Go to the iOS | Source | Unit Test Case class to create a test case class with the name ItemManagerTests, and put it in the Model folder. Import the ToDo module (@testable import ToDo) and remove the two test method templates.

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