Book Image

Test-Driven iOS Development with Swift 4 - Third Edition

By : Dr. Dominik Hauser
Book Image

Test-Driven iOS Development with Swift 4 - Third Edition

By: Dr. Dominik Hauser

Overview of this book

Test-driven development (TDD) is a proven way to find software bugs early. Writing tests before you code improves the structure and maintainability of your apps. Using TDD, in combination with Swift 4's improved syntax, means there is no longer any excuse for writing bad code. This book will help you understand the process of TDD and how to apply it to your apps written in Swift. Through practical, real-world examples, you’ll learn how to implement TDD in context. You will begin with an overview of the TDD workflow and then delve into unit-testing concepts and code cycles. You will also plan and structure your test-driven iOS app, and write tests to drive the development of view controllers and helper classes. Next, you’ll learn how to write tests for network code and explore how the test-driven approach—in combination with stubs—helps you write network code even before the backend component is finished. Finally, the book will guide you through the next steps to becoming a testing expert by discussing integration tests, Behavior Driven Development (BDD), open source testing frameworks, and UI Tests (introduced in Xcode 9).
Table of Contents (9 chapters)

Implementing ItemListViewController

Let's start with the list showing the to-do items. This is the most important view controller. It is the first view that a user sees when the app has started.

This controller is also responsible for presenting the input screen that allows the user to add to-do items to the list. In addition, it also presents the detail screen that shows the details of selected to-do items.

We first need to structure the files in the Project Navigator in order to enable seamless navigation between the different files. Select the three model files that we already have (ToDoItem.swift, Location.swift, and ItemManager.swift), and hold down the ctrl key while you click on one of the selected files. Xcode presents a menu similar to what's shown in the following screenshot:

Select New Group from Selection and call it Model. Do the same in the test target...