Desktop: call device unlock what this platform calls it, not Windows Hello everywhere

tests/DodoSSH.Client.App.Tests/DeviceUnlockWordingTests.cs

@@ -0,0 +1,64 @@
+using DodoSSH.Client.Shell.ViewModels;
+
+namespace DodoSSH.Client.App.Tests;
+
+/// <summary>
+/// That unlocking with the device key is described in the words of the platform it runs on.
+/// </summary>
+/// <remarks>
+/// The unlock card offered "USE WINDOWS HELLO" on a Mac and the settings page told a Linux machine it needed a
+/// Windows keystore. Each platform's wording is checked for every other platform's names, because that is the
+/// mistake: a sentence borrowed from the one platform the feature was written on first.
+/// </remarks>
+public sealed class DeviceUnlockWordingTests
+{
+    public static TheoryData<string> Platforms => ["Windows", "Mac", "Linux", "Android"];
+
+    [Theory]
+    [MemberData(nameof(Platforms))]
+    public void EachPlatform_NamesOnlyItsOwnGesture(string platform)
+    {
+        var wording = For(platform);
+
+        var foreign = new Dictionary<string, string[]>(StringComparer.Ordinal)
+        {
+            ["Windows"] = ["Touch ID", "Secure Enclave", "fingerprint", "PIN"],
+            ["Mac"] = ["Windows", "TPM", "fingerprint", "PIN"],
+            ["Linux"] = ["Windows", "Touch ID", "Secure Enclave", "fingerprint"],
+            ["Android"] = ["Windows", "TPM", "Touch ID", "Secure Enclave"],
+        }[platform];
+
+        string[] said =
+            [wording.Name, wording.Button, wording.Wait, wording.Offer, wording.Registered, wording.Unavailable, wording.Tip];
+
+        foreach (var sentence in said)
+        {
+            sentence.ShouldNotBeNullOrWhiteSpace();
+
+            foreach (var name in foreign)
+            {
+                sentence.ShouldNotContain(name, Case.Sensitive, $"{platform}: \"{sentence}\"");
+            }
+        }
+
+        wording.Button.ShouldBe(wording.Button.ToUpperInvariant(), "every button on these screens is in capitals");
+    }
+
+    [Fact]
+    public void TheWordingInUse_IsThisMachines()
+    {
+        var expected = OperatingSystem.IsMacOS() ? DeviceUnlockWording.Mac
+            : OperatingSystem.IsLinux() ? DeviceUnlockWording.Linux
+            : DeviceUnlockWording.Windows;
+
+        DeviceUnlockWording.ForThisPlatform.ShouldBeSameAs(expected);
+    }
+
+    private static DeviceUnlockWording For(string platform) => platform switch
+    {
+        "Windows" => DeviceUnlockWording.Windows,
+        "Mac" => DeviceUnlockWording.Mac,
+        "Linux" => DeviceUnlockWording.Linux,
+        _ => DeviceUnlockWording.Android,
+    };
+}