Phase B (T1-5/T1-6/T2-2/T2-8/T2-12): download manager flyout w/ speed+pause/resume/cancel, bookmark bar, tab sleeping, tab search (open+closed), context menu w/ 'download video from this link' (79 tests GREEN)

VideoDownloader.Tests/Browser/PageDownloadTrackerTests.cs

@@ -0,0 +1,103 @@
+using VideoDownloader.App.Browser.Features;
+
+namespace VideoDownloader.Tests.Browser;
+
+/// <summary>페이지 다운로드 추상화(다운로드 매니저 UI 의 로직 코어) — fake op 로 검증.</summary>
+public interface IFakeOpHost { }
+
+public class PageDownloadTrackerTests
+{
+    private sealed class FakeOp : IDownloadOperation
+    {
+        public string Uri { get; set; } = "https://x.test/file.zip";
+        public string FileName { get; set; } = "file.zip";
+        public long BytesReceived { get; set; }
+        public long TotalBytesToReceive { get; set; } = 1000;
+        public string State { get; set; } = "InProgress";
+        public bool Paused, Resumed, Cancelled;
+
+        public event Action? Changed;
+        public void Raise() => Changed?.Invoke();
+
+        public void Pause() { Paused = true; State = "Paused"; Raise(); }
+        public void Resume() { Resumed = true; State = "InProgress"; Raise(); }
+        public void Cancel() { Cancelled = true; State = "Cancelled"; Raise(); }
+    }
+
+    [Fact]
+    public void Add는_항목을_등록하고_최근순_정렬한다()
+    {
+        var t = new PageDownloadTracker();
+        var a = new FakeOp { FileName = "a.zip" };
+        var b = new FakeOp { FileName = "b.zip" };
+        t.Add(a, a.FileName);
+        t.Add(b, b.FileName);
+        Assert.Equal(2, t.Items.Count);
+        Assert.Equal("b.zip", t.Items[0].FileName); // 최신 우선
+    }
+
+    [Fact]
+    public void 진행률과_속도를_계산한다()
+    {
+        var t = new PageDownloadTracker();
+        var op = new FakeOp { TotalBytesToReceive = 1000 };
+        var item = t.Add(op, "f.zip");
+
+        item.UpdateSpeed(500, TimeSpan.FromSeconds(2)); // 500B/2s = 250 B/s
+        Assert.Equal(50.0, item.Percent, 2);
+        Assert.Equal(250, item.BytesPerSecond);
+        Assert.Equal("250.0 B/s", item.SpeedText);
+    }
+
+    [Fact]
+    public void 속도_단위는_KB_MB로_표시된다()
+    {
+        var t = new PageDownloadTracker();
+        var item = t.Add(new FakeOp { TotalBytesToReceive = 10_000_000 }, "f");
+
+        item.UpdateSpeed(0, TimeSpan.FromSeconds(1)); // 초기
+        Assert.Equal("—", item.SpeedText);
+
+        item = t.Add(new FakeOp { TotalBytesToReceive = 10_000_000 }, "g");
+        item.UpdateSpeed(2048 * 100, TimeSpan.FromSeconds(1)); // 200 KB/s
+        Assert.Equal("200.0 KB/s", item.SpeedText);
+
+        item = t.Add(new FakeOp { TotalBytesToReceive = 10_000_000 }, "h");
+        item.UpdateSpeed(3 * 1024 * 1024L, TimeSpan.FromSeconds(1)); // 3 MB/s
+        Assert.Equal("3.0 MB/s", item.SpeedText);
+    }
+
+    [Fact]
+    public void Pause_Resume_Cancel_위임()
+    {
+        var t = new PageDownloadTracker();
+        var op = new FakeOp();
+        var item = t.Add(op, "f");
+
+        t.Pause(item); t.Resume(item); t.Cancel(item);
+        Assert.True(op.Paused && op.Resumed && op.Cancelled);
+    }
+
+    [Fact]
+    public void 완료_항목은_ClearCompleted로_일괄_제거()
+    {
+        var t = new PageDownloadTracker();
+        var done = new FakeOp { State = "Completed" };
+        var running = new FakeOp { State = "InProgress" };
+        t.Add(done, "d"); t.Add(running, "r");
+
+        t.ClearCompleted();
+        Assert.Single(t.Items);
+        Assert.Equal("r", t.Items[0].FileName);
+    }
+
+    [Fact]
+    public void 취소된_항목도_ClearCompleted로_제거된다()
+    {
+        var t = new PageDownloadTracker();
+        var c = new FakeOp { State = "Interrupted" };
+        t.Add(c, "c");
+        t.ClearCompleted();
+        Assert.Empty(t.Items);
+    }
+}