fix(FN-4201): add autosize regression coverage and finalize gates
Fusion-Task-Id: FN-4201 Fusion-Task-Lineage: 6bfc2e72-8c11-4e63-b3c7-9245965d2380
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Fusion
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import { beforeEach, describe, expect, it, vi } from "vitest";
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import { render, screen, waitFor } from "@testing-library/react";
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import { userEvent } from "@testing-library/user-event";
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import { ChatView, clampChatInputHeight } from "../ChatView";
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import * as useChatModule from "../../hooks/useChat";
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import * as useChatRoomsModule from "../../hooks/useChatRooms";
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import type { ChatSessionInfo, UseChatReturn } from "../../hooks/useChat";
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import type { UseChatRoomsResult } from "../../hooks/useChatRooms";
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import { _resetInitialViewportHeight } from "../../hooks/useMobileKeyboard";
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Element.prototype.scrollIntoView = vi.fn();
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vi.mock("../../hooks/useChat");
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vi.mock("../../hooks/useChatRooms");
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vi.mock("../../hooks/useNavigationHistory", async (importOriginal) => {
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const actual = await importOriginal<typeof import("../../hooks/useNavigationHistory")>();
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return {
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...actual,
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useNavigationHistoryContext: () => ({ pushNav: vi.fn(), replaceCurrent: vi.fn() }),
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};
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});
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vi.mock("../../api", async (importOriginal) => {
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const actual = await importOriginal<typeof import("../../api")>();
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return {
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...actual,
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fetchAgents: vi.fn().mockResolvedValue([]),
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fetchDiscoveredSkills: vi.fn().mockResolvedValue([]),
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searchFiles: vi.fn().mockResolvedValue({ files: [] }),
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};
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});
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const mockUseChat = vi.mocked(useChatModule.useChat);
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const mockUseChatRooms = vi.mocked(useChatRoomsModule.useChatRooms);
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const sessionOne: ChatSessionInfo = {
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id: "session-001",
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agentId: "agent-001",
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status: "active",
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title: "Session One",
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createdAt: "2026-04-08T00:00:00.000Z",
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updatedAt: "2026-04-08T00:00:00.000Z",
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};
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const sessionTwo: ChatSessionInfo = {
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...sessionOne,
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id: "session-002",
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title: "Session Two",
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};
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const roomOne = {
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id: "room-001",
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name: "Room One",
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slug: "room-one",
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description: null,
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projectId: "proj-123",
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createdBy: "agent-001",
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status: "active" as const,
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createdAt: "2026-04-08T00:00:00.000Z",
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updatedAt: "2026-04-08T00:00:00.000Z",
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};
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const defaultChatState: UseChatReturn = {
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sessions: [sessionOne, sessionTwo],
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activeSession: sessionOne,
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sessionsLoading: false,
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messages: [],
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messagesLoading: false,
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isStreaming: false,
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streamingText: "",
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streamingThinking: "",
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streamingToolCalls: [],
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selectSession: vi.fn(),
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createSession: vi.fn().mockResolvedValue(sessionTwo),
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archiveSession: vi.fn(),
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deleteSession: vi.fn(),
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sendMessage: vi.fn(),
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stopStreaming: vi.fn(),
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pendingMessage: "",
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clearPendingMessage: vi.fn(),
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loadMoreMessages: vi.fn(),
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hasMoreMessages: false,
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searchQuery: "",
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setSearchQuery: vi.fn(),
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filteredSessions: [sessionOne, sessionTwo],
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refreshSessions: vi.fn(),
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agentsMap: new Map(),
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};
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const defaultRoomsState: UseChatRoomsResult = {
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rooms: [roomOne],
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roomsLoading: false,
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roomsError: null,
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activeRoom: roomOne,
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activeRoomMembers: [],
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messages: [],
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messagesLoading: false,
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selectRoom: vi.fn(),
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createRoom: vi.fn(),
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deleteRoom: vi.fn(),
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sendRoomMessage: vi.fn().mockResolvedValue(undefined),
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refreshRooms: vi.fn(),
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};
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function setup(chatOverrides: Partial<UseChatReturn> = {}, roomsOverrides: Partial<UseChatRoomsResult> = {}) {
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mockUseChat.mockReturnValue({ ...defaultChatState, ...chatOverrides });
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mockUseChatRooms.mockReturnValue({ ...defaultRoomsState, ...roomsOverrides });
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}
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function mockDesktopViewport() {
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if (!window.matchMedia) {
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Object.defineProperty(window, "matchMedia", { value: vi.fn(), configurable: true, writable: true });
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}
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Object.defineProperty(window, "innerWidth", { value: 1280, configurable: true });
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vi.spyOn(window, "matchMedia").mockImplementation((query: string) => ({
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matches: false,
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media: query,
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onchange: null,
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addListener: vi.fn(),
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removeListener: vi.fn(),
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addEventListener: vi.fn(),
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removeEventListener: vi.fn(),
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dispatchEvent: vi.fn(),
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}));
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}
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function renderChatView() {
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return render(<ChatView projectId="proj-123" addToast={vi.fn()} experimentalFeatures={{ chatRooms: true }} />);
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}
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describe("ChatView composer autosize", () => {
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beforeEach(() => {
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_resetInitialViewportHeight();
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vi.clearAllMocks();
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localStorage.clear();
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mockDesktopViewport();
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setup();
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});
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it("resets composer height after send clears messageInput", async () => {
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const sendMessage = vi.fn();
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setup({ sendMessage });
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renderChatView();
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const textarea = screen.getByPlaceholderText("Type a message...") as HTMLTextAreaElement;
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Object.defineProperty(textarea, "scrollHeight", {
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configurable: true,
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get: () => (textarea.value.length > 0 ? 900 : 24),
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});
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await userEvent.type(textarea, "line one\nline two\nline three");
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const expandedHeight = Number.parseInt(textarea.style.height, 10);
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await userEvent.click(screen.getAllByTestId("chat-send-btn")[0]);
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await waitFor(() => {
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expect(sendMessage).toHaveBeenCalledWith("line one\nline two\nline three", []);
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expect(textarea).toHaveValue("");
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const resetHeight = Number.parseInt(textarea.style.height, 10);
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expect(resetHeight).toBeLessThan(expandedHeight);
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expect(resetHeight).toBe(clampChatInputHeight(24));
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});
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});
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it("recomputes height when draft restore switches to a shorter draft", async () => {
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localStorage.setItem("fusion:chat-draft:direct:session-001", "long long long long long");
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localStorage.setItem("fusion:chat-draft:direct:session-002", "ok");
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const originalScrollHeight = Object.getOwnPropertyDescriptor(HTMLTextAreaElement.prototype, "scrollHeight");
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Object.defineProperty(HTMLTextAreaElement.prototype, "scrollHeight", {
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configurable: true,
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get() {
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return (this as HTMLTextAreaElement).value.length > 4 ? 640 : 20;
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},
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});
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const { rerender } = renderChatView();
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const textarea = screen.getByPlaceholderText("Type a message...") as HTMLTextAreaElement;
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await waitFor(() => {
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expect(textarea).toHaveValue("long long long long long");
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expect(textarea.style.height).toBe(`${clampChatInputHeight(640)}px`);
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});
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setup({
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activeSession: sessionTwo,
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sessions: [sessionOne, sessionTwo],
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filteredSessions: [sessionOne, sessionTwo],
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});
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rerender(<ChatView projectId="proj-123" addToast={vi.fn()} experimentalFeatures={{ chatRooms: true }} />);
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await waitFor(() => {
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expect(textarea).toHaveValue("ok");
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expect(textarea.style.height).toBe(`${clampChatInputHeight(20)}px`);
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});
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if (originalScrollHeight) {
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Object.defineProperty(HTMLTextAreaElement.prototype, "scrollHeight", originalScrollHeight);
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}
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});
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it("uses the same clamp for direct typing and programmatic resets", async () => {
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const sendMessage = vi.fn();
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setup({ sendMessage });
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renderChatView();
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const textarea = screen.getByPlaceholderText("Type a message...") as HTMLTextAreaElement;
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Object.defineProperty(textarea, "scrollHeight", {
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configurable: true,
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get: () => 2000,
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});
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await userEvent.type(textarea, "oversized");
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const typingHeight = textarea.style.height;
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expect(typingHeight).toBe(`${clampChatInputHeight(2000)}px`);
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await userEvent.click(screen.getAllByTestId("chat-send-btn")[0]);
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await waitFor(() => {
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expect(textarea).toHaveValue("");
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expect(textarea.style.height).toBe(`${clampChatInputHeight(2000)}px`);
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expect(textarea.style.height).toBe(typingHeight);
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});
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});
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});
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