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.

Preface

Who this book is for

What this book covers

To get the most out of this book

Download the example code files

Download the color images

Conventions used

Share Your Thoughts

Section 1 –The Basics of Test-Driven iOS Development

Section 1 –The Basics of Test-Driven iOS Development

Free Chapter

Chapter 1: Your First Unit Tests

Chapter 1: Your First Unit Tests

Technical requirements

Building your first automatic unit test

Assert functions in the XCTest framework

Understanding the difference from other kinds of tests

Chapter 2: Understanding Test-Driven Development

Chapter 2: Understanding Test-Driven Development

The origin of TDD

The TDD workflow – red, green, refactor

The advantages of TDD

The disadvantages of TDD

Chapter 3: Test-Driven Development in Xcode

Chapter 3: Test-Driven Development in Xcode

Technical requirements

An example of TDD

Finding information about tests in Xcode

Setting up and tearing down

Debugging tests

Section 2 –The Data Model

Section 2 –The Data Model

Chapter 4: The App We Are Going to Build

Chapter 4: The App We Are Going to Build

Technical requirements

A list of to-do items

A view for the details of a to-do item

A view to add to-do items

The structure of the app

Getting started in Xcode

Chapter 5: Building a Structure for ToDo Items

Chapter 5: Building a Structure for ToDo Items

Technical requirements

Implementing the ToDoItem struct

Implementing the Location struct

Chapter 6: Testing, Loading, and Saving Data

Chapter 6: Testing, Loading, and Saving Data

Technical requirements

Publishing changes with Combine

Storing and loading ToDoItems

Section 3 –Views and View Controllers

Section 3 –Views and View Controllers

Chapter 7: Building a Table View Controller for the To-Do Items

Chapter 7: Building a Table View Controller for the To-Do Items

Technical requirements

Adding the table view for the to-do items

Testing the data source of a table view

Refactoring to a diffable data source

Presenting two sections

Implementing the delegate of a table view

Chapter 8: Building a Simple Detail View

Chapter 8: Building a Simple Detail View

Technical requirements

Adding labels, a button, and a map

Filling in the data

Checking the to-do item

Chapter 9: Test-Driven Input View in SwiftUI

Chapter 9: Test-Driven Input View in SwiftUI

Technical requirement

Adding the ViewInspector package

Using ViewInspector to test a simple view

Testing button actions with ViewInspector

Section 4 –Networking and Navigation

Section 4 –Networking and Navigation

Chapter 10: Testing Networking Code

Chapter 10: Testing Networking Code

Mocking CLGeoCoder

Testing async/await code that communicates with URLSession

Handling errors

Chapter 11: Easy Navigation with Coordinators

Chapter 11: Easy Navigation with Coordinators

Technical requirement

Testing the app's setup

Navigating to the details

Navigating to a modal view

Adding missing parts

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Summary

In this final chapter, we have implemented the navigation between the different views of our app. We have learned how to test pushing view controllers onto a navigation stack and how we can test whether a view got presented modally.

With navigation implemented, we started the app on the simulator and found and fixed bugs. We figured out that TDD even helps when fixing bugs. By writing first a failing test for that bug and then making the test pass, we ensured that this bug won't hurt us in the future of our app.

With the skills you gained in this chapter, you will be able to implement and test the navigation of an app using the coordinator pattern. And, you are now able to write tests for bugs and fix the bug by making the test pass.

Congratulations, you reached the end of this book! My hope is that this book is the beginning of your journey to becoming a test-driven developer. You learned how to test Combine code and write tests for view controllers and views...