iOS Development with TDD and Swift

Introduction

The book "Test-Driven Development with Swift" (2022) by Dr. Dominik Hauser is a practical guide to implementing the TDD methodology in the iOS app development process. The author, a well-known developer and author of several books on Swift, offers the reader not just theory, but ready-made recipes and templates that can be immediately applied in real projects. The book is aimed at developers already familiar with the basics of Swift and Xcode, but who want to take code quality to the next level.

What the book is about

The main idea of the book is to show how to write tests before writing working code (Red-Green-Refactor). The author consistently guides the reader through all stages: from setting up the environment and writing the first unit test to integration testing and UI testing. Special attention is paid to architectural patterns (MVC, MVVM, Coordinator) and how TDD helps design loosely coupled, testable components. The book covers real-world examples: working with networking, Core Data, asynchronous operations, animations, and gestures.

Who this book is for

• iOS developers with 1+ years of experience who want to integrate TDD into their workflow.
• Tech leads and architects striving to improve codebase stability and maintainability.
• Students and course graduates looking to master professional testing practices.

What the reader will learn

• Basics of TDD: the "red-green-refactor" cycle.
• How to write unit tests for models, controllers, and services.
• Using mocks, stubs, and fakes to isolate dependencies.
• Testing asynchronous code (URLSession, Combine, async/await).
• Integration testing with Core Data and networking.
• UI testing using XCUITest and the Page Object pattern.
• Refactoring legacy code with tests.
• Setting up CI/CD for automatic test execution.

Strengths

Practical focus. Each chapter contains ready-made code examples that can be downloaded from GitHub. Relevance. The book is written for Swift 5.7 and Xcode 14, using modern constructs (async/await, SwiftUI). Structure. The material is divided into logical blocks: from simple to complex, with repetition of key concepts. Author's authority. Dominik Hauser is a well-known iOS developer, author of popular books and courses; his writing style is clear and concise.

Who it is recommended for

The book will be useful for anyone who wants to stop being afraid of tests and start writing reliable, easily maintainable code. I especially recommend it to teams transitioning from "quick and dirty coding" to professional development. If you already use TDD in other languages (e.g., Python or Java), this book will help you quickly transfer those skills to the iOS world.