Getting Started In Visual Studio

The easiest way to get started is to install the NUnit Templates extension for Visual Studio. It will add project templates for the various Xamarin platforms.

For more general information, see Testing Xamarin Projects using NUnit 3.

Getting started

In your solution;

1. Add new test projects to your solution. These project types are included in the NUnit Templates Extension: NUnit 3 Test Project (Android). NUnit 3 Test Project (iOS), NUnit 3 Test Project (Universal Windows)
2. Write your unit tests in this project, in a portable project, or in a shared project, referencing the project with the tests.
3. Build and run the tests on your device or emulator

If your tests are in a separate portable project, note that:

• You need to add that assembly to the NUnit.Runner.App in the startup code

nunit.AddTestAssembly(typeof(MyTests).Assembly);

• Your portable project must reference the same NUnit Framework version as your nunit.xamarin version, e.g. if using nunit.xamarin 3.01, reference nunit.framework 3.01.

The startup code for each platform is as follows;

Android

MainActivity.cs

[Activity(Label = "NUnit 3", MainLauncher = true, Theme = "@android:style/Theme.Holo.Light", ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

        // This will load all tests within the current project
        var nunit = new NUnit.Runner.App();

        // If you want to add tests in another assembly
        //nunit.AddTestAssembly(typeof(MyTests).Assembly);

        // Do you want to automatically run tests when the app starts?
        nunit.Options = new TestOptions
            {
                AutoRun = true
            };

        LoadApplication(nunit);
    }
}

iOS

AppDelegate.cs

[Register("AppDelegate")]
public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
{
    //
    // This method is invoked when the application has loaded and is ready to run. In this
    // method you should instantiate the window, load the UI into it and then make the window
    // visible.
    //
    // You have 17 seconds to return from this method, or iOS will terminate your application.
    //
    public override bool FinishedLaunching(UIApplication app, NSDictionary options)
    {
        global::Xamarin.Forms.Forms.Init();

        // This will load all tests within the current project
        var nunit = new NUnit.Runner.App();

        // If you want to add tests in another assembly
        //nunit.AddTestAssembly(typeof(MyTests).Assembly);

        // Do you want to automatically run tests when the app starts?
        nunit.Options = new TestOptions
            {
                AutoRun = true
            };

        LoadApplication(nunit);

        return base.FinishedLaunching(app, options);
    }
}

Windows 10 Universal

MainPage.xaml

<forms:WindowsPage
    x:Class="NUnit.Runner.Tests.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:NUnit.Runner.Tests"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:forms="using:Xamarin.Forms.Platform.WinRT"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    </Grid>
</forms:WindowsPage>

MainPage.xaml.cs

public sealed partial class MainPage : WindowsPage
{
    public MainPage()
    {
        InitializeComponent();

        // Windows Universal will not load all tests within the current project,
        // you must do it explicitly below
        var nunit = new NUnit.Runner.App();

        // If you want to add tests in another assembly, add a reference and
        // duplicate the following line with a type from the referenced assembly
        nunit.AddTestAssembly(typeof(MainPage).GetTypeInfo().Assembly);

        // Do you want to automatically run tests when the app starts?
        nunit.Options = new TestOptions
            {
                AutoRun = true
            };

        LoadApplication(nunit);
    }
}

App.xaml.cs

protected override void OnLaunched(LaunchActivatedEventArgs e)
{
    // <SNIP>

    Frame rootFrame = Window.Current.Content as Frame;

    // Do not repeat app initialization when the Window already has content,
    // just ensure that the window is active
    if (rootFrame == null)
    {
        // Create a Frame to act as the navigation context and navigate to the first page
        rootFrame = new Frame();

        rootFrame.NavigationFailed += OnNavigationFailed;

        // ==> ADD THIS LINE <==
        Xamarin.Forms.Forms.Init(e);

        if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
        {
            // TODO: Load state from previously suspended application
        }

        // Place the frame in the current Window
        Window.Current.Content = rootFrame;
    }

    // <SNIP>
}