A example of a test for a Xamarin.Forms App with Mvvm

ContactPageModelTest.cs

[TestFixture]
public class ContactPageModelTests
{
    [Test]
    public static void CreateNewContact()
    {
        var container = A.Fake<IRootNavigation> ();
        TinyIoC.TinyIoCContainer.Current.Register<IRootNavigation> (container);

        var db = new DatabaseService (new SQLiteFactory());
        var vm = new ContactPageModel (db);
        vm.Init (null);

        //save to database
        vm.Contact.Name = "Peter";
        vm.Contact.Phone = "9087";
        vm.Done.Execute (null);

        Assert.IsTrue (vm.Contact.ContactId > 0);

        //get from database
        var savedContact 
                = db.Conn.Table<Contact> ().Where ((c) => c.ContactId == vm.Contact.ContactId).FirstOrDefault ();

        Assert.AreEqual ("Peter", savedContact.Name);
        Assert.AreEqual ("9087", savedContact.Phone);
        A.CallTo (() => container.PopPage ()).MustHaveHappened ();
    }
}