Squashed 'third_party/pi/' content from commit d981de122

git-subtree-dir: third_party/pi
git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

packages/coding-agent/test/chat-viewport.test.ts

@@ -0,0 +1,26 @@
+import { Container } from "@earendil-works/pi-tui";
+import { describe, expect, test } from "vitest";
+import { createChatViewport } from "../src/modes/interactive/chat-viewport.ts";
+
+describe("chat viewport", () => {
+	test("defaults the transcript scrollbar to auto and accepts overrides", () => {
+		const automatic = createChatViewport({
+			document: new Container(),
+			pendingMessages: new Container(),
+			status: new Container(),
+			editor: new Container(),
+			footer: new Container(),
+		});
+		const hidden = createChatViewport({
+			document: new Container(),
+			pendingMessages: new Container(),
+			status: new Container(),
+			editor: new Container(),
+			footer: new Container(),
+			scrollbar: "hidden",
+		});
+
+		expect(automatic.transcript.scrollbar).toBe("auto");
+		expect(hidden.transcript.scrollbar).toBe("hidden");
+	});
+});