Collection of test items, found in TestItem.children and TestController.items.
Online Documentation
Gets the number of items in the collection.
Adds the test item to the children. If an item with the same ID already exists, it'll be replaced.
Removes a single test item from the collection.
Iterate over each entry in this collection.
Efficiently gets a test item by ID, if it exists, in the children.
Replaces the items stored by the collection.