OAuth session persists via DPAPI; sign-in lives in the Start Stream dialog; add xUnit test project (6 passing)

ytLive.Tests/TokenStoreTests.cs

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+using System.IO;
+using Xunit;
+using ytLive.Helpers;
+using ytLive.Models;
+
+namespace ytLive.Tests;
+
+public class TokenStoreTests
+{
+    private static string TempPath() =>
+        Path.Combine(Path.GetTempPath(), "ytLive_tests", $"{Guid.NewGuid():N}.auth");
+
+    [Fact]
+    public void Save_Load_RoundtripsChannelAndTokens()
+    {
+        var path = TempPath();
+        var channel = new YouTubeChannel
+        {
+            ChannelId = "UC123",
+            DisplayName = "Test Channel",
+            ProfileImageUrl = "http://example/thumb.jpg",
+            AccessToken = "acc-token",
+            RefreshToken = "refresh-token",
+            TokenExpiry = DateTime.UtcNow.AddHours(1),
+        };
+
+        TokenStore.Save(channel, path);
+
+        var loaded = TokenStore.Load(path);
+        Assert.NotNull(loaded);
+        Assert.Equal("UC123", loaded!.ChannelId);
+        Assert.Equal("Test Channel", loaded.DisplayName);
+        Assert.Equal("http://example/thumb.jpg", loaded.ProfileImageUrl);
+        Assert.Equal("acc-token", loaded.AccessToken);
+        Assert.Equal("refresh-token", loaded.RefreshToken);
+        Assert.Equal(channel.TokenExpiry, loaded.TokenExpiry);
+    }
+
+    [Fact]
+    public void Load_MissingFile_ReturnsNull()
+    {
+        Assert.Null(TokenStore.Load(TempPath()));
+    }
+
+    [Fact]
+    public void Load_CorruptFile_ReturnsNull()
+    {
+        var path = TempPath();
+        Directory.CreateDirectory(Path.GetDirectoryName(path)!);
+        File.WriteAllBytes(path, [1, 2, 3, 4, 5]);
+        Assert.Null(TokenStore.Load(path));
+    }
+
+    [Fact]
+    public void Clear_RemovesSavedToken()
+    {
+        var path = TempPath();
+        TokenStore.Save(new YouTubeChannel { DisplayName = "X" }, path);
+        TokenStore.Clear(path);
+        Assert.Null(TokenStore.Load(path));
+    }
+}

ytLive.Tests/YouTubeAuthServiceTests.cs

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+using System.Net;
+using System.Text;
+using Xunit;
+using ytLive.Models;
+using ytLive.Services;
+
+namespace ytLive.Tests;
+
+public class YouTubeAuthServiceTests
+{
+    private sealed class FakeHandler : HttpMessageHandler
+    {
+        private readonly string _tokenResponse;
+        private readonly string _channelResponse;
+
+        public FakeHandler(string tokenResponse, string channelResponse)
+        {
+            _tokenResponse = tokenResponse;
+            _channelResponse = channelResponse;
+        }
+
+        protected override async Task<HttpResponseMessage> SendAsync(
+            HttpRequestMessage request, CancellationToken cancellationToken)
+        {
+            var isToken = request.RequestUri!.PathAndQuery.Contains("/token");
+            var body = isToken ? _tokenResponse : _channelResponse;
+            return new HttpResponseMessage(HttpStatusCode.OK)
+            {
+                Content = new StringContent(body, Encoding.UTF8, "application/json"),
+            };
+        }
+    }
+
+    private static YouTubeAuthService CreateService(string tokenResponse, string channelResponse) =>
+        new("test-id", "test-secret", new HttpClient(new FakeHandler(tokenResponse, channelResponse)));
+
+    [Fact]
+    public async Task ExchangeCodeForToken_MockServer_ParsesChannel()
+    {
+        var service = CreateService(
+            """{"access_token":"acc-123","refresh_token":"ref-123","expires_in":3600}""",
+            """{"items":[{"id":"UC123","snippet":{"title":"Test Channel","thumbnails":{"default":{"url":"http://example/thumb.jpg"}}}}]}""");
+
+        var channel = await service.ExchangeCodeForToken("auth-code", "http://localhost:8765/oauth2/callback");
+
+        Assert.NotNull(channel);
+        Assert.Equal("UC123", channel!.ChannelId);
+        Assert.Equal("Test Channel", channel.DisplayName);
+        Assert.Equal("http://example/thumb.jpg", channel.ProfileImageUrl);
+        Assert.Equal("acc-123", channel.AccessToken);
+        Assert.Equal("ref-123", channel.RefreshToken);
+        Assert.InRange(channel.TokenExpiry, DateTime.UtcNow.AddSeconds(3590), DateTime.UtcNow.AddSeconds(3610));
+    }
+
+    [Fact]
+    public async Task RefreshToken_MockServer_UpdatesAccessTokenAndExpiry()
+    {
+        var service = CreateService(
+            """{"access_token":"new-acc","expires_in":3600}""",
+            """{"items":[]}""");
+        service.SetSession(new YouTubeChannel
+        {
+            RefreshToken = "ref-123",
+            TokenExpiry = DateTime.UtcNow.AddMinutes(-5),
+        });
+
+        var ok = await service.RefreshToken();
+
+        Assert.True(ok);
+        Assert.Equal("new-acc", service.CurrentChannel!.AccessToken);
+        Assert.InRange(service.CurrentChannel.TokenExpiry,
+            DateTime.UtcNow.AddSeconds(3590), DateTime.UtcNow.AddSeconds(3610));
+    }
+}

ytLive.Tests/ytLive.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <IsPackable>false</IsPackable>
+    <EnableWindowsTargeting>true</EnableWindowsTargeting>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1"/>
+    <PackageReference Include="xunit" Version="2.9.2"/>
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2"/>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ytLive.csproj"/>
+  </ItemGroup>
+
+</Project>