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Test button next to Start runs the real private-only go-live pipeline as a session variant (IsTestStream): BeginTestStream -> extracted StartStreamingSession(alsoRecord:false) shared with the dialog path — no Go Live dialog, no 'last live' stamp, no recording. Gold top bar + TEST badge + 'End Test' button face; TEST drawer (third right-rail pull-out, three-way exclusivity) auto-opens once the liveChatId resolves. Chat tooling: Mock Chat Input sends a REAL liveChat/messages.insert (YouTubeStreamService.InsertChatMessageAsync) that round-trips the real ~2s poll and renders through the live overlay; simulated Subscriber/New Member/Super Chat events inject through the poller's MessageReceived seam (YouTubeChatService.InjectSimulatedMessage, ChatMessage.IsSimulated) — the insert API only creates textMessageEvent, so non-text events are local-only by design (ref: developers.google.com/youtube/v3/live/docs/liveChatMessages/insert). Scopes youtube + youtube.force-ssl already cover insert; no re-consent. Good Dog: ytLive.Tests/TestStreamTests.cs — coordinator protocol with fake HTTP + real-window drawer exclusivity/gate. 0 warnings; 314/314 pass (clean run; intermittent host abort is the pre-existing WinRT-webcam flake). Docs ride in the same change: TASKS.md row 41, TASKS/task-41-test-stream-mode.md, ai.md (YouTube Live API constraints), HANDOFF rewrite.