A ToDoItem can also have a due date represented by a timestamp. Add the following test to make sure we can initialize an instance of ToDoItem with timestamp:
func test_Init_SetsTimestamp() {
let item = ToDoItem(title: "", timestamp: 0.0) XCTAssertEqual(item.timestamp, 0.0, "should set timestamp")
}
Again, this test does not compile because there is an extra argument in the initializer. From the implementation of the other properties, we know that we have to add a timestamp property in ToDoItem and set it in the initializer:
struct ToDoItem {
let title: String
let itemDescription: String?
let timestamp: Double?
init(title: String,
itemDescription: String? = nil,
timestamp: Double? = nil) { self.title = title ...
