Phase C (T2-1..T3-10): command palette, reader mode (real Readability.js, E2E), boost force-dark, screenshot, split view, vertical tabs, Glance (Alt+click), tab groups (6 colors), workspaces, speed dial, InPrivate tabs, quick find, source view, print, PiP, TTS (94 tests GREEN)

VideoDownloader.Tests/Browser/TabGroupsWorkspacesTests.cs

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+using VideoDownloader.Browser.Tabs;
+
+namespace VideoDownloader.Tests.Browser;
+
+// ── T2-11 탭 그룹: 색상 라벨 + 그룹 단위 이동/닫기 ──
+public class TabGroupsTests
+{
+    private static TabManager NewManager() => new(() => new TabItem());
+
+    [Fact]
+    public void 그룹_지정과_해제()
+    {
+        var m = NewManager();
+        var t = m.NewTab("https://a.com");
+        m.SetGroup(t, "Work", "#e11");
+        Assert.Equal("Work", t.GroupName);
+        Assert.Equal("#e11", t.GroupColor);
+        m.SetGroup(t, null, null);
+        Assert.Null(t.GroupName);
+    }
+
+    [Fact]
+    public void 같은_그룹_탭은_서로_인접한다()
+    {
+        var m = NewManager();
+        var a = m.NewTab("a"); m.SetGroup(a, "G", "#111");
+        m.NewTab("b");         // 비그룹
+        var c = m.NewTab("c"); m.SetGroup(c, "G", "#111"); // 그룹으로 → a 옆으로 이동
+        Assert.Equal(1, m.Tabs.IndexOf(c));
+        Assert.Equal(0, m.Tabs.IndexOf(a));
+    }
+
+    [Fact]
+    public void 그룹_탭_전체_닫기()
+    {
+        var m = NewManager();
+        var a = m.NewTab("a"); m.SetGroup(a, "G", "#111");
+        var b = m.NewTab("b"); m.SetGroup(b, "G", "#111");
+        m.NewTab("solo");
+        var closed = m.CloseGroup("G");
+        Assert.Equal(2, closed);
+        Assert.Single(m.Tabs);
+    }
+}
+
+// ── T3-1 워크스페이스: 탭 세트 저장/전환 ──
+public class WorkspaceTests
+{
+    private static TabManager NewManager() => new(() => new TabItem());
+
+    [Fact]
+    public void 워크스페이스_저장후_스왑하면_탭_세트가_교체된다()
+    {
+        var m = NewManager();
+        m.NewTab("https://work1.com");
+        m.NewTab("https://work2.com");
+        var ws = m.CaptureWorkspace("Work");
+
+        m.NewTab("https://personal.com");
+        Assert.Equal(3, m.Tabs.Count);
+
+        m.SwitchWorkspace(ws);
+        Assert.Equal(2, m.Tabs.Count);
+        Assert.Equal("https://work1.com", m.Tabs[0].Url);
+        Assert.Equal("https://work2.com", m.Tabs[1].Url);
+        Assert.Equal("Work", ws.Name);
+    }
+
+    [Fact]
+    public void 워크스페이스_캡처는_현재_탭을_그대로_유지한다()
+    {
+        var m = NewManager();
+        m.NewTab("https://a.com");
+        var ws = m.CaptureWorkspace("X");
+        Assert.Equal(1, m.Tabs.Count); // 캡처 자체는 현재 상태 유지(스냅샷)
+        Assert.Single(ws.Urls);
+    }
+}