Book Image

Mastering Xamarin.Forms - Second Edition

By : Ed Snider
Book Image

Mastering Xamarin.Forms - Second Edition

By: Ed Snider

Overview of this book

Discover how to extend and build upon the components of the Xamarin.Forms toolkit to develop effective, robust mobile app architecture. Starting with an app built with the basics of the Xamarin.Forms toolkit, we'll go step by step through several advanced topics to create a solution architecture rich with the benefits of good design patterns and best practices. We'll start by introducing a core separation between the app's user interface and the app's business logic by applying the MVVM pattern and data-binding. Then we will focus on building out a layer of plugin-like services that handle platform-specific utilities such as navigation and geo-location, as well as how to loosely use these services in the app with inversion of control and dependency injection. Next we'll connect the app to a live web-based API and set up offline synchronization. Then, we'll dive into testing the app logic through unit tests. Finally, we will setup Visual Studio App Center to automate building, testing, distributing and monitoring the app.
Table of Contents (11 chapters)

Unit testing

To test the business logic in our TripLog app we will start out by creating a new unit test project in our solution that will be responsible for testing our ViewModels. There are many options and libraries to create unit tests in .NET with Visual Studio. In this chapter we will use the NUnit Library Project template in Visual Studio for Mac.

In order to create a unit test project, perform the following steps:

  1. Create a new solution folder in the TripLog solution named Tests. Although this is not required, it helps keep any testing-related projects organized within the overall solution. To add a new solution folder in Visual Studio, simply right-click on the solution name, go to Add and click on Add Solution Folder, as shown in the following screenshot:
Adding a new solution folder in Visual Studio for Windows is the same process: right-click on the solution name...