feat(ui): add UpdateCheckService

tests/ClaudeDo.Ui.Tests/Services/UpdateCheckServiceTests.cs

@@ -0,0 +1,62 @@
+using System.Net.Http;
+using ClaudeDo.Releases;
+using ClaudeDo.Ui.Services;
+
+namespace ClaudeDo.Ui.Tests.Services;
+
+public class UpdateCheckServiceTests
+{
+    private sealed class FakeReleaseClient : IReleaseClient
+    {
+        public GiteaRelease? Release { get; set; }
+        public bool Throw { get; set; }
+
+        public Task<GiteaRelease?> GetLatestReleaseAsync(CancellationToken ct)
+        {
+            if (Throw) throw new HttpRequestException();
+            return Task.FromResult(Release);
+        }
+
+        public Task DownloadAsync(string url, string destPath, IProgress<long> progress, CancellationToken ct)
+            => throw new NotSupportedException();
+    }
+
+    [Fact]
+    public async Task Check_NewerRelease_SetsUpdateAvailable()
+    {
+        var svc = new UpdateCheckService(new FakeReleaseClient
+        {
+            Release = new GiteaRelease("v0.3.0", "r", new[] { new ReleaseAsset("ClaudeDo-0.3.0-win-x64.zip", "u", 1) }),
+        },
+        currentVersion: "0.1.0");
+
+        await svc.CheckNowAsync(CancellationToken.None);
+
+        Assert.Equal(UpdateCheckStatus.UpdateAvailable, svc.LastCheckStatus);
+        Assert.True(svc.IsUpdateAvailable);
+        Assert.Equal("0.3.0", svc.LatestVersion);
+    }
+
+    [Fact]
+    public async Task Check_SameRelease_SetsUpToDate()
+    {
+        var svc = new UpdateCheckService(new FakeReleaseClient
+        {
+            Release = new GiteaRelease("v0.1.0", "r", new[] { new ReleaseAsset("ClaudeDo-0.1.0-win-x64.zip", "u", 1) }),
+        },
+        currentVersion: "0.1.0");
+
+        await svc.CheckNowAsync(CancellationToken.None);
+
+        Assert.Equal(UpdateCheckStatus.UpToDate, svc.LastCheckStatus);
+        Assert.False(svc.IsUpdateAvailable);
+    }
+
+    [Fact]
+    public async Task Check_NetworkError_SetsCheckFailedButDoesNotThrow()
+    {
+        var svc = new UpdateCheckService(new FakeReleaseClient { Throw = true }, "0.1.0");
+        await svc.CheckNowAsync(CancellationToken.None);
+        Assert.Equal(UpdateCheckStatus.CheckFailed, svc.LastCheckStatus);
+    }
+}