LehrerApp/LehrerApp.Desktop.Tests/WindowSettingsServiceTests.cs

using LehrerApp.Desktop.Services;
using Xunit;

namespace LehrerApp.Desktop.Tests;

public sealed class WindowSettingsServiceTests
{
    private static string BuildTempPath()
    {
        var path = Path.Combine(Path.GetTempPath(), $"lehrerapp-windowsettings-tests-{Guid.NewGuid():N}");
        Directory.CreateDirectory(path);
        return path;
    }

    [Fact]
    public void Load_OhneVorhandeneDatei_LiefertStandardgroesse()
    {
        var service = new WindowSettingsService(BuildTempPath());

        var settings = service.Load();

        Assert.Equal(1280, settings.Width);
        Assert.Equal(800, settings.Height);
        Assert.False(settings.IsMaximized);
    }

    [Fact]
    public void SaveUndLoad_PersistiertUeberNeueInstanz()
    {
        var path = BuildTempPath();
        new WindowSettingsService(path).Save(new WindowSettings { Width = 1600, Height = 950, IsMaximized = true });

        var reloaded = new WindowSettingsService(path).Load();

        Assert.Equal(1600, reloaded.Width);
        Assert.Equal(950, reloaded.Height);
        Assert.True(reloaded.IsMaximized);
    }

    /// Eine winzige oder negative Größe (z.B. durch eine beschädigte/manuell editierte Datei)
    /// darf das Fenster beim nächsten Start nicht unbenutzbar klein machen.
    [Fact]
    public void Load_UnplausibelKleineGroesse_FaelltAufStandardgroesseZurueck()
    {
        var path = BuildTempPath();
        new WindowSettingsService(path).Save(new WindowSettings { Width = 5, Height = 5 });

        var reloaded = new WindowSettingsService(path).Load();

        Assert.Equal(1280, reloaded.Width);
        Assert.Equal(800, reloaded.Height);
    }

    [Fact]
    public void Load_BeschaedigteDatei_FaelltAufStandardgroesseZurueck()
    {
        var path = BuildTempPath();
        File.WriteAllText(Path.Combine(path, "windowsettings.json"), "{ kein json");

        var settings = new WindowSettingsService(path).Load();

        Assert.Equal(1280, settings.Width);
        Assert.Equal(800, settings.Height);
    }
}