From a59fc754b6f1f274a939c81a12f86eb4199c8030 Mon Sep 17 00:00:00 2001
From: can1357 <me@can.ac>
Date: Sun, 16 Aug 2026 01:53:08 +0200
Subject: [PATCH] test(tui): covered welcome model synchronization

---
 ...interactive-mode-default-plan-mode.test.ts | 27 +++++++++++++
 .../test/modes/components/welcome.test.ts     | 40 -------------------
 2 files changed, 27 insertions(+), 40 deletions(-)

diff --git a/packages/coding-agent/test/interactive-mode-default-plan-mode.test.ts b/packages/coding-agent/test/interactive-mode-default-plan-mode.test.ts
index 868484a40..f49748752 100644
--- a/packages/coding-agent/test/interactive-mode-default-plan-mode.test.ts
+++ b/packages/coding-agent/test/interactive-mode-default-plan-mode.test.ts
@@ -142,6 +142,33 @@ describe("InteractiveMode plan.defaultOnStartup", () => {
 		expect(session?.getActiveToolNames()).toContain("read");
 	});
 
+	it("keeps the welcome banner synchronized across startup and later model switches", async () => {
+		Settings.instance.set("startup.quiet", false);
+		const settings = Settings.isolated({ "plan.defaultOnStartup": true, "compaction.enabled": false });
+		settings.setModelRole("plan", "anthropic/claude-haiku-4-5:high");
+		const created = createHarness(settings);
+		const initialModel = session?.model;
+		if (!initialModel) throw new Error("Expected initial model");
+
+		await created.init({ suppressWelcomeIntro: true });
+
+		const planModel = session?.model;
+		if (!planModel) throw new Error("Expected plan model");
+		expect(planModel.id).toBe("claude-haiku-4-5");
+		const rendered = Bun.stripANSI(created.ui.render(120).join("\n"));
+		expect(rendered).toContain(planModel.name);
+		expect(rendered).not.toContain(initialModel.name);
+
+		const requestRenderSpy = vi.spyOn(created.ui, "requestRender");
+		requestRenderSpy.mockClear();
+		await session!.setModel(initialModel);
+
+		expect(requestRenderSpy).toHaveBeenCalled();
+		const switched = Bun.stripANSI(created.ui.render(120).join("\n"));
+		expect(switched).toContain(initialModel.name);
+		expect(switched).not.toContain(planModel.name);
+	});
+
 	it("activates write when entering plan mode even if it was hidden by discoveryMode (issue #3165)", async () => {
 		// `plan-mode-active.md` instructs the agent to draft the plan file with
 		// `write` and refine it with `edit`. Under `tools.discoveryMode === "all"`
diff --git a/packages/coding-agent/test/modes/components/welcome.test.ts b/packages/coding-agent/test/modes/components/welcome.test.ts
index bb8adfec2..f1d5997d1 100644
--- a/packages/coding-agent/test/modes/components/welcome.test.ts
+++ b/packages/coding-agent/test/modes/components/welcome.test.ts
@@ -62,43 +62,3 @@ describe("WelcomeComponent tips", () => {
 		expect(pickWeightedTip([], 0.5)).toBe("");
 	});
 });
-
-// Regression coverage for the stale welcome banner bug: the component is
-// constructed with the session model at init time, but init-time model changes
-// (plan.defaultOnStartup, #reconcileModeFromSession, delayed config load) can
-// swap the model before the model_changed subscription exists. The catch-up
-// resync in InteractiveMode.init() calls setModel() after those steps; these
-// tests verify setModel() produces the correct rendered output.
-describe("WelcomeComponent model name", () => {
-	beforeAll(async () => {
-		await Settings.init({ inMemory: true });
-		await initTheme(false);
-	});
-
-	it("updates the rendered model name after setModel()", () => {
-		const welcome = new WelcomeComponent("1.0.0", "DeepSeek V4 Pro", "deepseek");
-		const before = welcome.render(100).join("\n");
-		expect(before).toContain("DeepSeek V4 Pro");
-
-		welcome.setModel("GLM-5.2", "zhipu-coding-plan");
-		const after = welcome.render(100).join("\n");
-		expect(after).toContain("GLM-5.2");
-		expect(after).not.toContain("DeepSeek V4 Pro");
-	});
-
-	it("resyncs to the live model after init-time model switches (catch-up path)", () => {
-		// Banner constructed with the pre-config fallback model (the startup race
-		// picks an alphabetically-first provider before modelRoles.default loads).
-		const welcome = new WelcomeComponent("1.0.0", "DeepSeek V4 Pro", "deepseek");
-		expect(welcome.render(100).join("\n")).toContain("DeepSeek V4 Pro");
-
-		// Config loads, session switches to the real default — the model_changed
-		// event fires before the subscription exists, so InteractiveMode.init()
-		// calls setModel() explicitly as a catch-up resync.
-		welcome.setModel("GLM-5.2", "zhipu-coding-plan");
-		const rendered = welcome.render(100).join("\n");
-		expect(rendered).toContain("GLM-5.2");
-		expect(rendered).toContain("zhipu-coding-plan");
-		expect(rendered).not.toContain("DeepSeek");
-	});
-});