Test or Go Fishing!
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Test or Go Fishing!

a guide on how to write better Swift for iOS using Test Driven Development

About the Book

This book is aimed at developers of all skills. Beginners will enjoy a gentle introduction into the tools and language as well as practical examples to understand tricky concepts. If this is the first time you've ventured outside PHP then you'll need to work extra hard to forget it.

Obviously, being already skilled in another serious programming language will help immensely. Advanced iOS developers will also benefit from revisiting the basics. Moreover, the structure of this book will encourage them to take a step back and think about how they build their apps and the things they take for granted.

About the Author

Paul Ardeleanu
Paul Ardeleanu

Paul is a software engineer, trainer and speaker specialised in data-driven solutions on Apple platforms with an emphasis on prototyping, best practices and balance with agility. He started programming back in the days of Fortran, graduated with a PhD in Computational Physics from UCLan and is currently building multi-platform software solutions at Lupo, a software consultancy in London, UK.

He blogs on Medium and often tweet from @pardel.

Table of Contents

Chapter 1. Introduction                                                                                                     7

1.1 Why another iOS book                                                                                                   7

1.2 Audience & technologies                                                                                               7

1.3 The title                                                                                                                          8

1.4 Feedback                                                                                                                        8

Chapter 2. Huh?! Testing?                                                                                               9

2.1 What is Test-Driven Development?                                                                              9

2.2 Feature, Red, Green, Refactor                                                                                    10

2.3 Testing in iOS                                                                                                               12

2.4 Still a debatable topic                                                                                                  14

Chapter 3. The Plan                                                                                                          16

3.1 Our end goal                                                                                                                16

3.2 MVC, MVP, MVVM                                                                                                       16

3.3 System components                                                                                                    19

3.4 Last piece of the puzzle: interface prototyping                                                           21

3.5 Tasks list screen                                                                                                           22

Chapter 4. The Task                                                                                                           24

4.1 TDD in Xcode Playgrounds                                                                                           24

4.2 A first test: tasks can be created                                                                                 25

4.3 setUp() and tearDown()                                                                                              27

4.4 Requirement: a task must have a name                                                                     29

4.5 Requirement: a task can have a due date                                                                   31

4.6 Requirement: a task can be completed                                                                      32

Chapter 5. The TaskManager                                                                                         36

5.1 Requirement: has a task manager                                                                              36

5.2 Requirement: manages tasks                                                                                      37

5.3 Refactoring                                                                                                                  40

5.4 TaskManager Singleton                                                                                               44

5.5 Introducing Realm                                                                                                       49

5.6 Task persistence                                                                                                          57

5.7 The complete source                                                                                                   59

Chapter 6. Migrating to an Xcode project                                                                                                 63

Appendix A – Apple development environment                                                                                       64

Appendix B – Swift and the iOS SDKs                                                                                                      64

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