Modularizing Legacy Projects Using TDD: Test-Driven Development with XCTest for iOS

Chapter 1: Introduction

Why write tests?

Levels of testing

Overview of TDD

Chapter 2: Your First Test

Basics of testing in iOS

XCTest

Code Examples

Chapter 3: The Testing Pyramid

Testing Level Values

Distributing tests along levels

Chapter 4: TDD Deep Dive

Core concepts

Complex examples

Implement projects from scratch with TDD

Chapter 5: Modularization for the Win

Introducing a legacy project

Transform with maintainability

Break up larger components

Apply TDD for modularization

Chapter 5: Dependency Injection and Mocks

Write tests for a component

Downsides of these techniques

Deciding when to apply

Chapter 6: Avoiding Threading Nightmares

Threading issues

Simulate situations

Determine which components need to have multithreading tests

Chapter 7: Testing Your Network Layer

Testing network code c

Differences between sync and async code

Test network code

Chapter 8: Taming CoreData

Core Data

Testing Core Data layer

Chapter 9: Adding Features to Legacy Apps

Testing concepts and techniques

Add a feature to an existing application

TDD and modularization

Modify a tested and modularized project

Chapter 10: Handling Production Issues

Improve the application quality

Make sure that similar problems don't happen again

Tools used to identify and keep track of bugs and crashes.

Add tests for every production issue discovered

Chapter 11: Performance Testing

Write performance tests

MetricKit

Value of performance testing

Write performance tests for iOS applications