test(releases): port ReleaseClient + ChecksumVerifier tests to new project

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/ClaudeDo.Releases.Tests/ReleaseClientTests.cs

@@ -0,0 +1,109 @@
+using System.Net;
+using System.Net.Http;
+using ClaudeDo.Releases;
+
+namespace ClaudeDo.Releases.Tests;
+
+public sealed class ReleaseClientTests
+{
+    private const string ApiBase = "https://git.example.test/api/v1/repos/releases/ClaudeDo";
+
+    [Fact]
+    public async Task GetLatestReleaseAsync_ParsesTagAndAssets()
+    {
+        const string json = """
+            {
+              "tag_name": "v0.2.0",
+              "name": "v0.2.0",
+              "assets": [
+                {
+                  "name": "ClaudeDo-0.2.0-win-x64.zip",
+                  "browser_download_url": "https://git.example.test/dl/zip",
+                  "size": 12345
+                },
+                {
+                  "name": "checksums.txt",
+                  "browser_download_url": "https://git.example.test/dl/checksums",
+                  "size": 128
+                }
+              ]
+            }
+            """;
+
+        var handler = new FakeHttpMessageHandler(HttpStatusCode.OK, json);
+        using var http = new HttpClient(handler);
+        var client = new ReleaseClient(http, ApiBase);
+
+        var release = await client.GetLatestReleaseAsync(CancellationToken.None);
+
+        Assert.NotNull(release);
+        Assert.Equal("v0.2.0", release!.TagName);
+        Assert.Equal(2, release.Assets.Count);
+        Assert.Equal("ClaudeDo-0.2.0-win-x64.zip", release.Assets[0].Name);
+        Assert.Equal("https://git.example.test/dl/zip", release.Assets[0].BrowserDownloadUrl);
+        Assert.Equal(12345, release.Assets[0].Size);
+    }
+
+    [Fact]
+    public async Task GetLatestReleaseAsync_Returns_Null_On404()
+    {
+        var handler = new FakeHttpMessageHandler(HttpStatusCode.NotFound, "");
+        using var http = new HttpClient(handler);
+        var client = new ReleaseClient(http, ApiBase);
+
+        var release = await client.GetLatestReleaseAsync(CancellationToken.None);
+
+        Assert.Null(release);
+    }
+
+    [Fact]
+    public async Task GetLatestReleaseAsync_Returns_Null_OnNetworkError()
+    {
+        var handler = new FakeHttpMessageHandler(_ => throw new HttpRequestException("boom"));
+        using var http = new HttpClient(handler);
+        var client = new ReleaseClient(http, ApiBase);
+
+        var release = await client.GetLatestReleaseAsync(CancellationToken.None);
+
+        Assert.Null(release);
+    }
+
+    [Fact]
+    public async Task GetLatestReleaseAsync_Hits_CorrectUrl()
+    {
+        var handler = new FakeHttpMessageHandler(HttpStatusCode.OK, "{\"tag_name\":\"v0.1.0\",\"assets\":[]}");
+        using var http = new HttpClient(handler);
+        var client = new ReleaseClient(http, ApiBase);
+
+        _ = await client.GetLatestReleaseAsync(CancellationToken.None);
+
+        Assert.Single(handler.Requests);
+        Assert.Equal($"{ApiBase}/releases/latest", handler.Requests[0].RequestUri!.ToString());
+    }
+
+    [Fact]
+    public async Task DownloadAsync_WritesBytesToDisk()
+    {
+        var payload = new byte[] { 1, 2, 3, 4, 5 };
+        var handler = new FakeHttpMessageHandler(_ => new HttpResponseMessage(HttpStatusCode.OK)
+        {
+            Content = new ByteArrayContent(payload)
+        });
+        using var http = new HttpClient(handler);
+        var client = new ReleaseClient(http, ApiBase);
+
+        var tempPath = Path.Combine(Path.GetTempPath(), "ClaudeDoDlTest-" + Guid.NewGuid().ToString("N"));
+        try
+        {
+            await client.DownloadAsync("https://example/foo", tempPath,
+                new Progress<long>(_ => { }), CancellationToken.None);
+
+            Assert.True(File.Exists(tempPath));
+            Assert.Equal(payload, File.ReadAllBytes(tempPath));
+        }
+        finally
+        {
+            if (File.Exists(tempPath)) File.Delete(tempPath);
+        }
+    }
+}