Book Image

Test-Driven iOS Development with Swift

By : Dr. Dominik Hauser
Book Image

Test-Driven iOS Development with Swift

By: Dr. Dominik Hauser

Overview of this book

Test-driven development (TDD) is a proven way to find software bugs early. Writing tests before your code improves the structure and maintainability of your app. Test-Driven iOS Development with Swift will help you understand the process of TDD and how it impacts your applications written in Swift. Through practical, real-world examples, you’ll start seeing how to implement TDD in context. We will begin with an overview of your TDD workflow and then deep-dive into unit testing concepts and code cycles. We will showcase the workings of functional tests, which will help you improve the user interface. Finally, you will learn about automating deployments and continuous integration to run an environment.
Table of Contents (15 chapters)
Test-Driven iOS Development with Swift
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Implementing asynchronous tests


In the previous chapter, we wrote a stub for CLGeocoder. Now, we will write a test that asserts that the geocoder built into CoreLocation works as we expect it to. The fetching of coordinates from a geocoder is asynchronous. This means that we have to write a test that can deal with asynchronous interfaces.

But let's first structure the files a bit in the Project Navigator of Xcode. Select all the controller files in the main target (ItemListViewController.swift, ItemListDataProvider.swift, ItemCell.swift, DetailViewController.swift, and InputViewController.swift), and control + left-click to create a group from the selection. Let's call this group Controller. Do the same with the corresponding test cases in the test target.

Now, let's get started with the test. We start naïvely. Add the following test to InputViewControllerTests:

func test_GeocoderWorksAsExpected() {
    
    CLGeocoder().geocodeAddressString("Infinite Loop 1, Cupertino") {
        (placemarks...