In the previous section, we created a class to act as the data source and delegate for the item list table view. In this section, we will implement its properties and methods, but we first need a test case class for ItemListDataProvider.
Implementing ItemListDataProvider
Conducting the first tests
Open Project Navigator and select the ToDoTests group. Add a new Unit Test Case Class and call it ItemListDataProviderTests. Add the @testable import ToDo import statement and remove the two test template methods.
The table view should have two sections--one for unchecked to-do items and the other for checked items. Add the following test to ItemListDataProviderTests:
func test_NumberOfSections_IsTwo() {
let sut = ItemListDataProvider...
