Desktop: put the keyboard in the closed vault's card on launch, and let Enter sign in and enrol

tests/DodoSSH.Client.App.Layout.Tests/ClosedVaultFocusTests.cs

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+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Threading;
+using DodoSSH.Client.App.Views;
+using DodoSSH.Client.Session;
+using DodoSSH.Client.Session.Tests;
+using DodoSSH.Client.Shell.ViewModels;
+using DodoSSH.Client.Ssh;
+using DodoSSH.Client.Storage;
+using DodoSSH.Client.Terminal;
+using DodoSSH.Client.Transfer;
+using DodoSSH.Crypto;
+using NSubstitute;
+
+namespace DodoSSH.Client.App.Layout.Tests;
+
+/// <summary>
+/// The keyboard on the cards a closed vault shows: where it is when the card appears, and what Enter does.
+/// </summary>
+/// <remarks>
+/// <para>
+/// Launch used to leave the keyboard nowhere. Focus only moved on the way out of an unlocked vault, so the
+/// passphrase somebody started typing the moment the window appeared went nowhere until they clicked the box,
+/// and Enter in the server address did nothing at all.
+/// </para>
+/// <para>
+/// The whole window, which <see cref="LayoutHarnessTests.WhyTheWindowItselfIsNeverShown"/> says cannot be shown
+/// here: the terminal's WebView refuses this thread's apartment when it is attached. It is taken out of the
+/// tree before the window is shown, which is everything that test is about and nothing these are.
+/// </para>
+/// </remarks>
+public sealed class ClosedVaultFocusTests
+{
+    private const string Passphrase = "a sufficiently long passphrase";
+
+    private static readonly Argon2Profile CheapProfile =
+        Argon2Profile.FromStoredParameters(memoryKibibytes: 8 * 1024, passes: 1, parallelism: 1);
+
+    private static CancellationToken Token => TestContext.Current.CancellationToken;
+
+    [Fact]
+    public async Task AFreshMachine_PutsTheKeyboardInTheServerAddressAndEnterSignsIn()
+    {
+        using var caches = ClientCacheFactory.ForMemory($"focus-{Guid.CreateVersion7():N}");
+        await caches.MigrateAsync(Token);
+
+        await using var workspace = Workspace();
+        await using var shell = Shell(caches, workspace);
+
+        await shell.StartAsync(Token);
+        shell.State.ShouldBe(ShellState.NeedsServer);
+
+        await LayoutHarness.OnTheUiThreadAsync(
+            () => WithWindow(shell, window =>
+            {
+                var box = window.FindControl<TextBox>("ServerUrlBox").ShouldNotBeNull();
+
+                window.FocusManager!.GetFocusedElement().ShouldBeSameAs(box);
+
+                box.KeyBindings.ShouldContain(binding =>
+                    binding.Gesture == new KeyGesture(Key.Enter) && binding.Command == shell.SignInCommand);
+            }),
+            Token);
+    }
+
+    [Fact]
+    public async Task AnEnrolledMachine_PutsTheKeyboardInThePassphraseBox()
+    {
+        using var caches = ClientCacheFactory.ForMemory($"focus-{Guid.CreateVersion7():N}");
+        await caches.MigrateAsync(Token);
+
+        await new AccountProvisioner(new FakeAccountServer(), new StubKeyBinding(), caches, TimeProvider.System, CheapProfile)
+            .EnrollAsync("https://dodossh.example", Passphrase, "laptop", "Personal", Token);
+
+        await using var workspace = Workspace();
+        await using var shell = Shell(caches, workspace);
+
+        await shell.StartAsync(Token);
+        shell.State.ShouldBe(ShellState.Locked);
+
+        await LayoutHarness.OnTheUiThreadAsync(
+            () => WithWindow(shell, window =>
+                window.FocusManager!.GetFocusedElement()
+                    .ShouldBeSameAs(window.FindControl<UnlockCard>("UnlockPane").ShouldNotBeNull().PassphraseBox)),
+            Token);
+    }
+
+    private static TerminalWorkspace Workspace() =>
+        new(
+            new InMemoryTerminalAssetProvider(new Dictionary<string, TerminalAsset>(StringComparer.Ordinal)),
+            Substitute.For<ISshConnectionFactory>(),
+            TimeProvider.System);
+
+    private static MainWindowViewModel Shell(ClientCacheFactory caches, TerminalWorkspace workspace) =>
+        new(
+            new ClientPaths(Path.Combine(Path.GetTempPath(), $"dodossh-focus-{Guid.CreateVersion7():N}")),
+            caches,
+            workspace,
+            new VaultKnownHostStore(),
+            new UnavailableDeviceKeyStore(),
+            static (_, _) => throw new InvalidOperationException("A layout test has no network."),
+            TimeProvider.System,
+            Substitute.For<ISftpSessionFactory>(),
+            CheapProfile);
+
+    private static void WithWindow(MainWindowViewModel shell, Action<MainWindow> assert)
+    {
+        var window = new MainWindow { DataContext = shell };
+
+        if (window.FindControl<NativeWebView>("Terminal") is { Parent: Panel panel } web)
+        {
+            panel.Children.Remove(web);
+        }
+
+        try
+        {
+            LayoutHarness.Settle(window, LayoutHarness.MinimumWidth, LayoutHarness.MinimumHeight);
+            Dispatcher.UIThread.RunJobs();
+
+            assert(window);
+        }
+        finally
+        {
+            window.Close();
+        }
+    }
+}