feat: implement tags tab, board search execution and markdown export wiring

YKanBan.Tests/TestUtilities/ScriptedDialogService.cs

@@ -0,0 +1,50 @@
+using YKanBan.ViewModels.Dialogs;
+
+namespace YKanBan.Tests.TestUtilities;
+
+/// <summary>
+/// Records every dialog shown and lets a test script answer it. The result
+/// is whatever the dialog closed with; a dialog the script leaves open
+/// counts as dismissed. The save-file dialog answers with
+/// <see cref="SaveFilePath"/>.
+/// </summary>
+internal sealed class ScriptedDialogService : IDialogService
+{
+    public List<DialogViewModelBase> Shown { get; } = [];
+
+    public Func<DialogViewModelBase, Task> Script { get; set; } = _ => Task.CompletedTask;
+
+    public string? SaveFilePath { get; set; }
+
+    public List<string> SuggestedFileNames { get; } = [];
+
+    public async Task<bool> ShowAsync(DialogViewModelBase dialog)
+    {
+        Shown.Add(dialog);
+        bool? result = null;
+        dialog.CloseRequested += (_, closed) => result ??= closed;
+        await Script(dialog);
+        return result ?? false;
+    }
+
+    public Task<string?> PickSaveFilePathAsync(string suggestedFileName)
+    {
+        SuggestedFileNames.Add(suggestedFileName);
+        return Task.FromResult(SaveFilePath);
+    }
+
+    /// <summary>Answers every confirmation dialog with the given choice.</summary>
+    public static Func<DialogViewModelBase, Task> AnswerConfirmations(bool confirm) => dialog =>
+    {
+        if (dialog is ConfirmDialogViewModel confirmation)
+        {
+            if (confirm)
+            {
+                confirmation.ConfirmCommand.Execute(null);
+                return Task.CompletedTask;
+            }
+            return confirmation.CancelCommand.ExecuteAsync(null);
+        }
+        return Task.CompletedTask;
+    };
+}