One plugin-bar button and one tabbed window, as the original

Live in 0.1.19 the plugin put three buttons on the plugin bar (MM, Mossy
Tracker, Metas), the tracker carried the icon that belongs to the main
window, and the metas downloads were in a window of their own.

Now only the main window has a bar button: "MM" with the original
window's icon (7735, 0x06001E37). Its tabs follow the original's notebook:
Main, Settings, Statistics, Mossy Tracker, Metas, Tools. The Mossy Tracker
tab is the original page, one "Open Mossy Tracker" button that opens the
tracker window; that window is registered without a bar button and
opened through the host's ShowPanel. The Metas tab holds everything the
metas window had (list with search, refresh, check, download outdated,
download one file, last check, status), plus the repository address and
the two folders the files land in. The main window forwards those
bindings to the meta sync's view model, since markup binds one object.

Downloads already went to the host's VTank profile storage, the one
MossTank reads, under mosstank/metas and mosstank/navs with each file's
own name and extension; the tab now shows those full folder paths
instead of the storage root. Backend frames are untouched.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/OpenAC.MosswartMassacre.Tests/Views/OneWindowTests.cs

@@ -0,0 +1,164 @@
+using System.Reflection;
+using System.Xml.Linq;
+using OpenAC.MosswartMassacre.FlagTracker;
+using OpenAC.MosswartMassacre.Metas;
+using OpenAC.MosswartMassacre.Tests.Fakes;
+using OpenAC.MosswartMassacre.Views;
+
+namespace OpenAC.MosswartMassacre.Tests.Views;
+
+/// <summary>
+/// The plugin shows as the original did: one button on the plugin bar, "MM"
+/// with the original window's icon, opening one tabbed window. The Mossy
+/// Tracker tab opens the tracker window, which has no bar button of its own,
+/// and the Metas tab holds the meta and nav downloads.
+/// </summary>
+/// <remarks>
+/// The tabs are driven the way the host drives them: each binding is looked
+/// up by the name the markup gives it and read or invoked by reflection.
+/// </remarks>
+public sealed class OneWindowTests
+{
+    private const uint OriginalIcon = 0x06001E37;
+
+    private static PluginHarness WithUi()
+    {
+        var harness = new PluginHarness(arrange: host => host.HasUi = true);
+        harness.Login();
+        return harness;
+    }
+
+    [Fact]
+    public void The_plugin_bar_gets_one_button_MM_with_the_original_icon()
+    {
+        using PluginHarness harness = WithUi();
+
+        RegisteredPanel shelf = Assert.Single(harness.Host.Ui.Panels, panel => panel.Descriptor.ShowInSidePanel);
+        Assert.Equal("main", shelf.Descriptor.WindowId);
+        Assert.Equal("MM", shelf.Descriptor.IconText);
+        Assert.Equal(OriginalIcon, shelf.Descriptor.IconSurfaceId);
+        Assert.EndsWith(MainWindow.MarkupFile, shelf.MarkupPath, StringComparison.Ordinal);
+        Assert.IsType<MainWindow>(shelf.Binding);
+
+        // The only other window is the tracker, opened from its tab.
+        RegisteredPanel other = Assert.Single(harness.Host.Ui.Panels, panel => !panel.Descriptor.ShowInSidePanel);
+        Assert.Equal("flagtracker", other.Descriptor.WindowId);
+        Assert.Equal(2, harness.Host.Ui.Panels.Count);
+    }
+
+    [Fact]
+    public void The_main_window_has_the_original_tabs_plus_metas()
+    {
+        XElement root = LoadMain();
+
+        string[] tabs = [.. root.Elements("tab").Select(tab => (string?)tab.Attribute("text") ?? string.Empty)];
+        Assert.Equal(["Main", "Settings", "Statistics", "Mossy Tracker", "Metas", "Tools"], tabs);
+        foreach (string tab in tabs)
+            Assert.NotNull(PageOf(root, tab));
+    }
+
+    [Fact]
+    public void The_mossy_tracker_tab_opens_the_tracker_window()
+    {
+        using PluginHarness harness = WithUi();
+        MainWindow window = harness.Feature<MainWindow>();
+        FlagTrackerViewModel tracker = harness.Feature<FlagTrackerFeature>().Panel!;
+        XElement page = PageOf(LoadMain(), "Mossy Tracker")!;
+
+        XElement tab = LoadMain().Elements("tab").Single(t => (string?)t.Attribute("text") == "Mossy Tracker");
+        Invoke(window, (string?)tab.Attribute("onclick"));
+        Assert.True(Read<bool>(window, (string?)page.Attribute("visible")));
+
+        XElement button = Assert.Single(page.Elements("button"), b => (string?)b.Attribute("text") == "Open Mossy Tracker");
+        Assert.False(tracker.IsVisible);
+        Invoke(window, (string?)button.Attribute("onclick"));
+
+        Assert.True(tracker.IsVisible);
+        Assert.Equal(["flagtracker"], harness.Host.Ui.ShowPanelCalls);
+    }
+
+    [Fact]
+    public void The_metas_tab_is_bound_to_the_meta_sync_and_names_the_real_folders()
+    {
+        using PluginHarness harness = WithUi();
+        MainWindow window = harness.Feature<MainWindow>();
+        MetasViewModel metas = harness.Feature<MetaSyncFeature>().Panel!;
+        XElement page = PageOf(LoadMain(), "Metas")!;
+
+        // The file list, its search and the download buttons are all here.
+        XElement list = Assert.Single(page.Elements("list"));
+        string[] columnItems = [.. list.Elements("column").Select(column => (string?)column.Attribute("items") ?? string.Empty)];
+        Assert.Equal(3, columnItems.Length);
+        Assert.Equal(["No files loaded"], Read<IReadOnlyList<string>>(window, columnItems[1]));
+        Assert.Single(page.Elements("field"), field => (string?)field.Attribute("onchange") is not null);
+        string[] buttons = [.. page.Elements("button").Select(b => (string?)b.Attribute("text") ?? string.Empty)];
+        Assert.Contains("Refresh List", buttons);
+        Assert.Contains("Check Updates", buttons);
+        Assert.Contains("Download Outdated", buttons);
+        Assert.Contains("Download", buttons);
+
+        // The labels name the folders the automation plugin loads from.
+        string vtankRoot = harness.Host.VtankProfiles.RootPath!;
+        string[] labels = [.. page.Elements("label").Select(label => Text(window, (string?)label.Attribute("text")))];
+        Assert.Contains(labels, text => text.EndsWith(Path.Combine(vtankRoot, "mosstank", "metas"), StringComparison.Ordinal));
+        Assert.Contains(labels, text => text.EndsWith(Path.Combine(vtankRoot, "mosstank", "navs"), StringComparison.Ordinal));
+
+        // Typing in the tab's search reaches the meta sync and redraws the list.
+        XElement search = page.Elements("field").Single(f => (string?)f.Attribute("onchange") is not null);
+        Invoke(window, (string?)search.Attribute("onchange"), "zzz");
+        Assert.Equal("zzz", metas.SearchText);
+        Assert.Equal(["No matches"], Read<IReadOnlyList<string>>(window, columnItems[1]));
+        Assert.Equal("zzz", Text(window, (string?)search.Attribute("text")));
+    }
+
+    [Fact]
+    public void The_metas_tab_changes_the_repository_address()
+    {
+        using PluginHarness harness = WithUi();
+        MainWindow window = harness.Feature<MainWindow>();
+        XElement page = PageOf(LoadMain(), "Metas")!;
+        XElement field = Assert.Single(page.Elements("field"), f => (string?)f.Attribute("onsubmit") is not null);
+
+        Assert.Equal(MetaSyncManager.DefaultRepositoryUrl, Text(window, (string?)field.Attribute("text")));
+        Invoke(window, (string?)field.Attribute("onsubmit"), " https://example.org/club/metas ");
+        Assert.Equal("https://example.org/club/metas", harness.Context.Settings.Current.MetasRepositoryUrl);
+        Assert.Equal("https://example.org/club/metas", Text(window, (string?)field.Attribute("text")));
+    }
+
+    // ── markup helpers ──
+
+    private static XElement LoadMain() =>
+        XDocument.Load(Path.Combine(AppContext.BaseDirectory, MainWindow.MarkupFile)).Root!;
+
+    /// <summary>The group a tab shows: the one whose visibility is the tab's selected binding.</summary>
+    private static XElement? PageOf(XElement root, string tabText)
+    {
+        XElement? tab = root.Elements("tab").SingleOrDefault(t => (string?)t.Attribute("text") == tabText);
+        string? selected = (string?)tab?.Attribute("selected");
+        return selected is null
+            ? null
+            : root.Elements("group").SingleOrDefault(group => (string?)group.Attribute("visible") == selected);
+    }
+
+    private static PropertyInfo Property(object binding, string? expression)
+    {
+        Assert.NotNull(expression);
+        Assert.Matches("^\\{[^{}]+\\}$", expression);
+        PropertyInfo? property = binding.GetType().GetProperty(expression[1..^1]);
+        Assert.True(property is not null, $"{expression} names no public property on {binding.GetType().Name}.");
+        return property;
+    }
+
+    private static T Read<T>(object binding, string? expression) =>
+        Assert.IsAssignableFrom<T>(Property(binding, expression).GetValue(binding));
+
+    /// <summary>A label's text: the literal, or the bound value.</summary>
+    private static string Text(object binding, string? text) =>
+        text is not null && text.StartsWith('{') ? Read<object>(binding, text).ToString() ?? string.Empty : text ?? string.Empty;
+
+    private static void Invoke(object binding, string? expression) =>
+        Read<Action>(binding, expression)();
+
+    private static void Invoke(object binding, string? expression, string argument) =>
+        Read<Action<string>>(binding, expression)(argument);
+}