Book Image

Test-Driven iOS Development with Swift 4 - Third Edition

By : Dr. Dominik Hauser
Book Image

Test-Driven iOS Development with Swift 4 - Third Edition

By: Dr. Dominik Hauser

Overview of this book

Test-driven development (TDD) is a proven way to find software bugs early. Writing tests before you code improves the structure and maintainability of your apps. Using TDD, in combination with Swift 4's improved syntax, means there is no longer any excuse for writing bad code. This book will help you understand the process of TDD and how to apply it to your apps written in Swift. Through practical, real-world examples, you’ll learn how to implement TDD in context. You will begin with an overview of the TDD workflow and then delve into unit-testing concepts and code cycles. You will also plan and structure your test-driven iOS app, and write tests to drive the development of view controllers and helper classes. Next, you’ll learn how to write tests for network code and explore how the test-driven approach—in combination with stubs—helps you write network code even before the backend component is finished. Finally, the book will guide you through the next steps to becoming a testing expert by discussing integration tests, Behavior Driven Development (BDD), open source testing frameworks, and UI Tests (introduced in Xcode 9).
Table of Contents (9 chapters)

Code Coverage

We now have about 80 tests and the code that makes tests pass, but do the tests really test all the code? Using TDD, the code coverage of our tests should be quite high. Should.

Instead of guessing, we would rather have numbers that tell us how good the code coverage of our tests really is. Before Xcode 7, it was quite difficult to measure the coverage of a test suite, but with version 7, Apple added this feature to Xcode.

In this chapter, we will measure the code coverage of our tests, and we will take a look at how we can use Xcode Server and fastlane to automate everyday tasks in our lives as iOS developers. The chapter is structured like this:

  • Enabling code coverage
  • Automatic deployment with fastlane