feat(releases): add SelfUpdater.DecideUpdateAsync

tests/ClaudeDo.Releases.Tests/SelfUpdaterTests.cs

@@ -1,3 +1,5 @@
+using System.Net.Http;
+
 namespace ClaudeDo.Releases.Tests;
 
 public class SelfUpdaterAssetMatchingTests
@@ -42,3 +44,83 @@ public class SelfUpdaterAssetMatchingTests
         Assert.Null(SelfUpdater.FindInstallerAsset(assets));
     }
 }
+
+public class SelfUpdaterDecisionTests
+{
+    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("boom");
+            return Task.FromResult(Release);
+        }
+
+        public Task DownloadAsync(string url, string destPath, IProgress<long> progress, CancellationToken ct)
+            => throw new NotSupportedException("not used in decision tests");
+    }
+
+    [Fact]
+    public async Task Decide_NoRelease_NoUpdate()
+    {
+        var client = new FakeReleaseClient { Release = null };
+        var d = await SelfUpdater.DecideUpdateAsync(client, currentVersion: "0.1.0", CancellationToken.None);
+        Assert.Equal(SelfUpdateDecisionKind.NoUpdate, d.Kind);
+    }
+
+    [Fact]
+    public async Task Decide_NetworkError_NoUpdate()
+    {
+        var client = new FakeReleaseClient { Throw = true };
+        var d = await SelfUpdater.DecideUpdateAsync(client, "0.1.0", CancellationToken.None);
+        Assert.Equal(SelfUpdateDecisionKind.NoUpdate, d.Kind);
+    }
+
+    [Fact]
+    public async Task Decide_OlderLatest_NoUpdate()
+    {
+        var client = new FakeReleaseClient
+        {
+            Release = new GiteaRelease("v0.1.0", "rel", new[]
+            {
+                new ReleaseAsset("ClaudeDo.Installer-0.1.0.exe", "u", 1),
+            }),
+        };
+        var d = await SelfUpdater.DecideUpdateAsync(client, "0.2.0", CancellationToken.None);
+        Assert.Equal(SelfUpdateDecisionKind.NoUpdate, d.Kind);
+    }
+
+    [Fact]
+    public async Task Decide_NewerLatestWithAsset_UpdateAvailable()
+    {
+        var client = new FakeReleaseClient
+        {
+            Release = new GiteaRelease("v0.3.0", "rel", new[]
+            {
+                new ReleaseAsset("ClaudeDo.Installer-0.3.0.exe", "https://x", 20),
+                new ReleaseAsset("checksums.txt", "https://checks", 1),
+            }),
+        };
+        var d = await SelfUpdater.DecideUpdateAsync(client, "0.2.0", CancellationToken.None);
+        Assert.Equal(SelfUpdateDecisionKind.UpdateAvailable, d.Kind);
+        Assert.Equal("0.3.0", d.LatestVersion);
+        Assert.NotNull(d.InstallerAsset);
+        Assert.NotNull(d.ChecksumsAsset);
+    }
+
+    [Fact]
+    public async Task Decide_NewerLatestButNoInstallerAsset_NoUpdate()
+    {
+        var client = new FakeReleaseClient
+        {
+            Release = new GiteaRelease("v0.3.0", "rel", new[]
+            {
+                new ReleaseAsset("ClaudeDo-0.3.0-win-x64.zip", "u", 20),
+            }),
+        };
+        var d = await SelfUpdater.DecideUpdateAsync(client, "0.2.0", CancellationToken.None);
+        Assert.Equal(SelfUpdateDecisionKind.NoUpdate, d.Kind);
+    }
+}