How to make JSON Localization work in Unit Test project

To make the JSON localization work, here is what I do now:

• 1. Have xxx.json file marked as Resource file in Visual Studio's File Properties tab. The same as the Babel example in MvvmCross tutorials which can be found here
• 2. Add the plugin needed. Json, JsonLocalization, ResourceLoader, etc using Nuget which will add plugin XxxBootstrap classes
• 3. Use the below code to initialize in the Setup of the unit test

            IMvxPluginManager pluginManager = new MvxFilePluginManager(".wpf", string.Empty);
            Ioc.RegisterSingleton(pluginManager);
            new ResourceLoaderPluginBootstrap().Run();
            new JsonPluginBootstrap().Run();
            new JsonLocalisationPluginBootstrap().Run();

            var builder = new TextProviderBuilder();
            Mvx.RegisterSingleton<IMvxTextProviderBuilder>(builder);
            Mvx.RegisterSingleton(builder.TextProvider);

• 4. add WPF assemblies, like WindowBase.dll, System.Windows.dll, System.Xaml.dll, PresentationFramework.dll. This is for WPF ResourceLoader plugin to work.
• 5. we have to ensure that System.Reflection.Assembly.GetEntryAssembly not return null for below code in WPF ResourceLoader plugin

    public class MvxWpfResourceLoader : MvxResourceLoader
    {
        public override void GetResourceStream(string resourcePath, Action<Stream> streamAction)
        {
            StreamResourceInfo resourceStream = Application.GetResourceStream(new Uri(resourcePath, UriKind.Relative));
            if (resourceStream != null)
            {
                streamAction(resourceStream.Stream);
            }
            else
            {
                streamAction(null);
            }
        }
    }

The cirtical line is Application.GetResourceStream(new Uri(resourcePath, UriKind.Relative)) which will call Assembly.GetEntryAssembly() method.

For this I change the test assembly's output type to Console and Run the unit test in the App.Main method like below

    class App
    {
        public static void Main(string[] args)
        {
            var testHomeViewModel = new TestHomeViewModel();
            testHomeViewModel.SetUp();
            testHomeViewModel.TestShareCommand();
        }
    }

Alternatively, arguably better approach would be to use the below code to set the Entry Assembly

        public static void SetEntryAssembly()
        {
            SetEntryAssembly(Assembly.GetExecutingAssembly());
        }

        /// <summary>
        /// Allows setting the Entry Assembly when needed. 
        /// Use AssemblyUtilities.SetEntryAssembly() as first line in XNA ad hoc tests
        /// </summary>
        /// <param name="assembly">Assembly to set as entry assembly</param>
        public static void SetEntryAssembly(Assembly assembly)
        {
            AppDomainManager manager = new AppDomainManager();
            FieldInfo entryAssemblyfield = manager.GetType().GetField("m_entryAssembly", BindingFlags.Instance | BindingFlags.NonPublic);
            entryAssemblyfield.SetValue(manager, assembly);

            AppDomain domain = AppDomain.CurrentDomain;
            FieldInfo domainManagerField = domain.GetType().GetField("_domainManager", BindingFlags.Instance | BindingFlags.NonPublic);
            domainManagerField.SetValue(domain, manager);
        }

I found this clever trick from this answer on Stackoverflow That should do the trick, :)