Book Image

Xamarin 4.x Cross-Platform Application Development - Third Edition

By : Jonathan Peppers
Book Image

Xamarin 4.x Cross-Platform Application Development - Third Edition

By: Jonathan Peppers

Overview of this book

Xamarin is a leading cross-platform application development tool used by top companies such as Coca-Cola, Honeywell, and Alaska Airlines to build apps. Version 4 features significant updates to the platform including the release of Xamarin.Forms 2.0 and improvements have been made to the iOS and Android designers. Xamarin was acquired by Microsoft so it is now a part of the Visual Studio family. This book will show you how to build applications for iOS, Android, and Windows. You will be walked through the process of creating an application that comes complete with a back-end web service and native features such as GPS location, camera, push notifications, and other core features. Additionally, you’ll learn how to use external libraries with Xamarin and Xamarin.Forms to create user interfaces. This book also provides instructions for Visual Studio and Windows. This edition has been updated with new screenshots and detailed steps to provide you with a holistic overview of the new features in Xamarin 4.
Table of Contents (19 chapters)
Xamarin 4.x Cross-Platform Application Development - Third Edition
About the Author
About the Reviewer
Customer Feedback

Writing unit tests

Since all the code we've written so far is not dependent on the user interface, we can easily write unit tests against our classes. This step is generally taken after the first implementation of a ViewModel class. Proponents of Test Driven Development (TDD) would recommend writing tests first and implementing things afterward, so choose which method is best for you. In either case, it is a good idea to write tests against your shared code before you start using them from the View layer, so you catch bugs before they hold up your development on the UI.

Xamarin projects take advantage of an open source testing framework called NUnit. It was originally derived from a Java testing framework called JUnit, and is the de-facto standard for unit testing C# applications. Xamarin Studio provides several project templates for writing tests with NUnit.

Setting up a new project for unit tests

Let's set up a new project for unit tests by performing the following steps:

  1. Add a new NUnit Library...