Open ToDoItemTests.swift and add the following import expression right below import XCTest:
@testable import ToDo
This is needed in order to be able to test the ToDo module. The @testable keyword makes the internal methods of the ToDo module accessible to the test case.
Remove the two template test methods, testExample() and testPerformanceExample().
The title of a to-do item is required. Let's write a test to ensure that an initializer exists that will take a title string. Add the following test method to the end of the test case (but within the ToDoItemTests class):
func test_Init_TakesTitle() {
ToDoItem(title: "Foo")
}
The static analyzer built into Xcode will complain about Use of unresolved identifier 'ToDoItem' ...
