AtomUI/tests/fixtures/LanguagePackEndToEnd/Consumer/Program.cs

using Acme.LocalizationComponent;
using Acme.LocalizationComponent.Localization;
using Acme.LocalizationConsumer.Localization;
using AtomUI;
using AtomUI.Localization;
using Avalonia;
using Avalonia.Headless;

namespace Acme.LocalizationConsumer;

public static class Program
{
    public static int Main()
    {
        AppBuilder.Configure<FixtureApplication>()
                  .UseHeadless(new AvaloniaHeadlessPlatformOptions())
                  .SetupWithoutStarting();

        var application = Application.Current ?? throw new InvalidOperationException(
            "The fixture application was not initialized.");
        var localizer = application.GetLocalizer() ?? throw new InvalidOperationException(
            "The fixture localizer was not registered.");
        var manager = application.GetLanguageManager() ?? throw new InvalidOperationException(
            "The fixture language manager was not registered.");

        if (localizer.Get(AppLangResourceKind.Title) != "Language pack fixture" ||
            localizer.Get(WelcomeLangResourceKind.Greeting) != "Welcome")
        {
            return 1;
        }

        manager.ChangeLanguage(LanguageTags.JaJP);
        if (localizer.Get(AppLangResourceKind.Title) != "言語パック フィクスチャ" ||
            localizer.Get(WelcomeLangResourceKind.Greeting) != "ようこそ" ||
            localizer.Format(WelcomeLangResourceKind.ItemCount, 3) != "3 件の項目があります。")
        {
            return 2;
        }

        Console.WriteLine(
            $"ja-JP:Welcome={localizer.Get(WelcomeLangResourceKind.Greeting)};" +
            $"ItemCount={localizer.Format(WelcomeLangResourceKind.ItemCount, 3)}");

        return 0;
    }
}

public partial class FixtureApplication : Application
{
    public override void Initialize()
    {
        this.UseAtomUI(builder =>
        {
            builder.UseLanguages(
                LanguageTags.EnUS,
                [LanguageTags.EnUS, LanguageTags.JaJP]);
            builder.UseLocalizationComponent();
        });
    }
}