Book Image

Test-Driven iOS Development with Swift - Fourth Edition

By : Dr. Dominik Hauser
5 (1)
Book Image

Test-Driven iOS Development with Swift - Fourth Edition

5 (1)
By: Dr. Dominik Hauser

Overview of this book

Test-driven development (TDD) is a proven way to find software bugs earlier on in software development. Writing tests before you code improves the structure and maintainability of your apps, and so using TDD in combination with Swift 5.5's improved syntax leaves you with no excuse for writing bad code. Developers working with iOS will be able to put their knowledge to work with this practical guide to TDD in iOS. This book will help you grasp the fundamentals and show you how to run TDD with Xcode. You'll learn how to test network code, navigate between different parts of the app, run asynchronous tests, and much more. Using practical, real-world examples, you'll begin with an overview of the TDD workflow and get to grips with unit testing concepts and code cycles. You'll then develop an entire iOS app using TDD while exploring different strategies for writing tests for models, view controllers, and networking code. Additionally, you'll explore how to test the user interface and business logic of iOS apps and even write tests for the network layer of the sample app. By the end of this TDD book, you'll be able to implement TDD methodologies comfortably in your day-to-day development for building scalable and robust applications.
Table of Contents (17 chapters)
1
Section 1 –The Basics of Test-Driven iOS Development
5
Section 2 –The Data Model
9
Section 3 –Views and View Controllers
13
Section 4 –Networking and Navigation

Adding the table view for the to-do items

As always, we start with a test. But before we can write the test, we need a new test class. Follow these steps to add a test class for the view controller that shows the to-do items:

  1. Select the ToDoTests group in the Project navigator and add a new file from the File menu in Xcode. Select the template from iOS | Source | Unit Test Case Class and then click Next. Insert the name ToDoItemsListViewControllerTests.
  2. In the created file, add @testable import ToDo and remove the two template test methods.
  3. Add a property for the system under test (sut):
    // ToDoItemsListViewControllerTests.swift
    class ToDoItemsListViewControllerTests: XCTestCase {
     
      var sut: ToDoItemsListViewController!
     
      override func setUpWithError() throws {
        // Put setup code here. This ...
      }
     
      override func tearDownWithError() throws {
        // Put teardown code here. This ...