diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 59f5a3d..98cdcf9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,7 @@ jobs:
           cache: "npm"
       - run: npm ci
       - run: npm run test:coverage
+      - run: npm run test:crap
       - run: npm run build
       - run: npx playwright install --with-deps chromium
       - run: npm run test:e2e
diff --git a/eslint.config.js b/eslint.config.js
index 79a552e..6a679b0 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -23,6 +23,8 @@ export default tseslint.config(
         "warn",
         { allowConstantExport: true },
       ],
+      "@typescript-eslint/no-explicit-any": "error",
+      "@typescript-eslint/explicit-function-return-type": "warn",
     },
   },
 );
diff --git a/package.json b/package.json
index 1ca0f12..4aecb02 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,8 @@
     "prepare": "husky install",
     "test": "vitest run",
     "test:watch": "vitest",
-    "test:coverage": "vitest run --coverage && tsx scripts/crap-score.ts",
+    "test:coverage": "vitest run --coverage",
+    "test:crap": "vitest run --coverage && tsx scripts/crap-score.ts",
     "test:e2e": "npx bddgen && npx playwright test",
     "prod-config": "ampx generate outputs --app-id dx58fjke2s86k --branch main --profile personal",
     "sandbox": "ampx sandbox --profile personal --once",
diff --git a/src/App.test.tsx b/src/App.test.tsx
new file mode 100644
index 0000000..f68e21f
--- /dev/null
+++ b/src/App.test.tsx
@@ -0,0 +1,111 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+
+vi.mock("aws-amplify", () => ({
+  Amplify: { configure: vi.fn() },
+}));
+
+vi.mock("amazon-chime-sdk-component-library-react", () => ({
+  MeetingProvider: ({ children }: { children: React.ReactNode }) => (
+    <div data-testid="meeting-provider">{children}</div>
+  ),
+  FeaturedVideoTileProvider: ({ children }: { children: React.ReactNode }) => (
+    <div>{children}</div>
+  ),
+}));
+
+vi.mock("@aws-amplify/ui-react", () => ({
+  Card: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
+  View: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
+  useTheme: () => ({
+    tokens: { space: { medium: "1rem" } },
+  }),
+}));
+
+vi.mock("./components/Header", () => ({
+  Header: () => <div data-testid="header">Header</div>,
+}));
+
+vi.mock("./components/LandingPage", () => ({
+  LandingPage: () => <div data-testid="landing-page">LandingPage</div>,
+}));
+
+vi.mock("./components/MeetingControlBar", () => ({
+  default: () => <div data-testid="control-bar">ControlBar</div>,
+}));
+
+vi.mock("./components/VideoMeeting", () => ({
+  default: () => <div data-testid="video-meeting">VideoMeeting</div>,
+}));
+
+vi.mock("./components/CopyLink", () => ({
+  CopyLink: () => <div data-testid="copy-link">CopyLink</div>,
+}));
+
+vi.mock("./components/AttendeeList", () => ({
+  AttendeeList: () => <div data-testid="attendee-list">AttendeeList</div>,
+}));
+
+vi.mock("./components/ChatPanel", () => ({
+  ChatPanel: () => <div data-testid="chat-panel">ChatPanel</div>,
+}));
+
+vi.mock("./context/AttendeeNamesContext", () => ({
+  AttendeeNamesProvider: ({ children }: { children: React.ReactNode }) => (
+    <div>{children}</div>
+  ),
+  useAttendeeNamesContext: () => ({
+    broadcastNameChange: vi.fn(),
+  }),
+}));
+
+vi.mock("./context/ChatContext", () => ({
+  ChatProvider: ({ children }: { children: React.ReactNode }) => (
+    <div>{children}</div>
+  ),
+}));
+
+let mockUseMeeting = {
+  joinedMeetingId: null as string | null,
+  loadingAction: null,
+  error: null,
+  handleJoinMeeting: vi.fn(),
+  handleStartMeeting: vi.fn(),
+  attendeeName: "Test User",
+  setAttendeeName: vi.fn(),
+};
+
+vi.mock("./hooks/useMeeting", () => ({
+  useMeeting: () => mockUseMeeting,
+}));
+
+import App from "./App";
+
+describe("App", () => {
+  it("renders MeetingProvider wrapper", () => {
+    render(<App />);
+    expect(screen.getByTestId("meeting-provider")).toBeInTheDocument();
+  });
+
+  it("shows LandingPage when not in a meeting", () => {
+    mockUseMeeting = { ...mockUseMeeting, joinedMeetingId: null };
+    render(<App />);
+    expect(screen.getByTestId("landing-page")).toBeInTheDocument();
+    expect(screen.queryByTestId("video-meeting")).not.toBeInTheDocument();
+  });
+
+  it("shows meeting UI when joined", () => {
+    mockUseMeeting = { ...mockUseMeeting, joinedMeetingId: "meeting-123" };
+    render(<App />);
+    expect(screen.getByTestId("video-meeting")).toBeInTheDocument();
+    expect(screen.getByTestId("attendee-list")).toBeInTheDocument();
+    expect(screen.getByTestId("copy-link")).toBeInTheDocument();
+    expect(screen.getByTestId("chat-panel")).toBeInTheDocument();
+    expect(screen.queryByTestId("landing-page")).not.toBeInTheDocument();
+  });
+
+  it("always renders Header", () => {
+    render(<App />);
+    expect(screen.getByTestId("header")).toBeInTheDocument();
+  });
+});
diff --git a/src/amplify-outputs.d.ts b/src/amplify-outputs.d.ts
new file mode 100644
index 0000000..586d676
--- /dev/null
+++ b/src/amplify-outputs.d.ts
@@ -0,0 +1,4 @@
+declare module "*/amplify_outputs.json" {
+  const value: Record<string, unknown>;
+  export default value;
+}
diff --git a/src/components/AttendeeList.test.tsx b/src/components/AttendeeList.test.tsx
new file mode 100644
index 0000000..224f464
--- /dev/null
+++ b/src/components/AttendeeList.test.tsx
@@ -0,0 +1,50 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+
+vi.mock("amazon-chime-sdk-component-library-react", () => ({
+  MicrophoneActivity: ({ attendeeId }: { attendeeId: string }) => (
+    <div data-testid={`mic-${attendeeId}`} />
+  ),
+  RosterCell: ({ name, microphone }: { name: string; microphone: React.ReactNode }) => (
+    <div data-testid="roster-cell">{name}{microphone}</div>
+  ),
+  useAttendeeStatus: () => ({
+    muted: false,
+    videoEnabled: true,
+    sharingContent: false,
+  }),
+  useRosterState: () => ({
+    roster: {
+      "attendee-1": { name: "Alice" },
+      "attendee-2": { name: "Bob" },
+    },
+  }),
+}));
+
+vi.mock("../context/AttendeeNamesContext", () => ({
+  useAttendeeNamesContext: () => ({
+    getAttendeeName: (id: string) => `Display-${id}`,
+  }),
+}));
+
+import { AttendeeList } from "./AttendeeList";
+
+describe("AttendeeList", () => {
+  it("renders a row for each attendee", () => {
+    render(<AttendeeList />);
+    const cells = screen.getAllByTestId("roster-cell");
+    expect(cells).toHaveLength(2);
+  });
+
+  it("displays attendee names from context", () => {
+    render(<AttendeeList />);
+    expect(screen.getByText("Display-attendee-1")).toBeInTheDocument();
+    expect(screen.getByText("Display-attendee-2")).toBeInTheDocument();
+  });
+
+  it("renders microphone activity for each attendee", () => {
+    render(<AttendeeList />);
+    expect(screen.getByTestId("mic-attendee-1")).toBeInTheDocument();
+    expect(screen.getByTestId("mic-attendee-2")).toBeInTheDocument();
+  });
+});
diff --git a/src/components/ChatMessage.test.tsx b/src/components/ChatMessage.test.tsx
new file mode 100644
index 0000000..cba33e4
--- /dev/null
+++ b/src/components/ChatMessage.test.tsx
@@ -0,0 +1,87 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen, fireEvent } from "@testing-library/react";
+
+vi.mock("react-markdown", () => ({
+  default: ({ children }: { children: string }) => <div>{children}</div>,
+}));
+
+vi.mock("remark-gfm", () => ({
+  default: () => null,
+}));
+
+vi.mock("@aws-amplify/ui-react", () => ({
+  Text: ({ children }: { children: React.ReactNode }) => (
+    <span>{children}</span>
+  ),
+  Flex: ({ children }: { children: React.ReactNode }) => (
+    <div>{children}</div>
+  ),
+  Button: ({
+    children,
+    onClick,
+    title,
+  }: {
+    children: React.ReactNode;
+    onClick?: () => void;
+    title?: string;
+  }) => (
+    <button onClick={onClick} title={title}>
+      {children}
+    </button>
+  ),
+}));
+
+import { ChatMessageItem } from "./ChatMessage";
+
+describe("ChatMessageItem", () => {
+  const defaultProps = {
+    id: "msg-1",
+    senderName: "Alice",
+    text: "Hello world",
+    timestamp: new Date("2025-01-15T10:30:00").getTime(),
+    reactions: {} as Record<string, string[]>,
+    onReaction: vi.fn(),
+  };
+
+  it("renders sender name and message text", () => {
+    render(<ChatMessageItem {...defaultProps} />);
+    expect(screen.getByText("Alice")).toBeInTheDocument();
+    expect(screen.getByText("Hello world")).toBeInTheDocument();
+  });
+
+  it("renders existing reactions with counts", () => {
+    const props = {
+      ...defaultProps,
+      reactions: { "\u{1F44D}": ["Bob", "Charlie"] },
+    };
+    render(<ChatMessageItem {...props} />);
+    expect(screen.getByTitle("Bob, Charlie")).toBeInTheDocument();
+  });
+
+  it("calls onReaction when clicking an existing reaction", () => {
+    const onReaction = vi.fn();
+    const props = {
+      ...defaultProps,
+      reactions: { "\u{1F44D}": ["Bob"] },
+      onReaction,
+    };
+    render(<ChatMessageItem {...props} />);
+    fireEvent.click(screen.getByTitle("Bob"));
+    expect(onReaction).toHaveBeenCalledWith("msg-1", "\u{1F44D}");
+  });
+
+  it("shows emoji picker on + button click", () => {
+    render(<ChatMessageItem {...defaultProps} />);
+    fireEvent.click(screen.getByText("+"));
+    expect(screen.getByText("\u{1F44D}")).toBeInTheDocument();
+    expect(screen.getByText("\u{2764}\u{FE0F}")).toBeInTheDocument();
+  });
+
+  it("calls onReaction and hides picker when selecting emoji", () => {
+    const onReaction = vi.fn();
+    render(<ChatMessageItem {...defaultProps} onReaction={onReaction} />);
+    fireEvent.click(screen.getByText("+"));
+    fireEvent.click(screen.getByText("\u{1F525}"));
+    expect(onReaction).toHaveBeenCalledWith("msg-1", "\u{1F525}");
+  });
+});
diff --git a/src/components/ChatPanel.test.tsx b/src/components/ChatPanel.test.tsx
new file mode 100644
index 0000000..ade11f0
--- /dev/null
+++ b/src/components/ChatPanel.test.tsx
@@ -0,0 +1,121 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { render, screen, fireEvent } from "@testing-library/react";
+
+const mockSendMessage = vi.fn().mockReturnValue({});
+const mockSendReaction = vi.fn();
+const mockToggleChat = vi.fn();
+
+let mockChatContext = {
+  messages: [] as { id: string; senderName: string; text: string; timestamp: number; reactions: Record<string, string[]> }[],
+  sendMessage: mockSendMessage,
+  sendReaction: mockSendReaction,
+  isChatOpen: true,
+  toggleChat: mockToggleChat,
+  unreadCount: 0,
+  resetUnread: vi.fn(),
+};
+
+vi.mock("../context/ChatContext", () => ({
+  useChatContext: () => mockChatContext,
+}));
+
+vi.mock("./ChatMessage", () => ({
+  ChatMessageItem: ({ senderName, text }: { senderName: string; text: string }) => (
+    <div data-testid="chat-message">{senderName}: {text}</div>
+  ),
+}));
+
+vi.mock("@aws-amplify/ui-react", () => ({
+  View: ({ children, className }: { children: React.ReactNode; className?: string }) => (
+    <div className={className}>{children}</div>
+  ),
+  Text: ({ children }: { children: React.ReactNode }) => <span>{children}</span>,
+  Button: ({ children, onClick }: { children: React.ReactNode; onClick?: () => void }) => (
+    <button onClick={onClick}>{children}</button>
+  ),
+  Flex: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
+}));
+
+import { ChatPanel } from "./ChatPanel";
+
+describe("ChatPanel", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockChatContext = {
+      messages: [],
+      sendMessage: mockSendMessage,
+      sendReaction: mockSendReaction,
+      isChatOpen: true,
+      toggleChat: mockToggleChat,
+      unreadCount: 0,
+      resetUnread: vi.fn(),
+    };
+  });
+
+  it("renders nothing when chat is closed", () => {
+    mockChatContext.isChatOpen = false;
+    const { container } = render(<ChatPanel />);
+    expect(container.innerHTML).toBe("");
+  });
+
+  it("shows empty state when no messages", () => {
+    render(<ChatPanel />);
+    expect(screen.getByText(/No messages yet/)).toBeInTheDocument();
+  });
+
+  it("renders messages", () => {
+    mockChatContext.messages = [
+      { id: "1", senderName: "Bob", text: "Hi!", timestamp: Date.now(), reactions: {} },
+    ];
+    render(<ChatPanel />);
+    expect(screen.getByTestId("chat-message")).toBeInTheDocument();
+    expect(screen.getByText("Bob: Hi!")).toBeInTheDocument();
+  });
+
+  it("sends a message on button click", () => {
+    mockSendMessage.mockReturnValue({});
+    render(<ChatPanel />);
+    const textarea = screen.getByPlaceholderText("Type a message...");
+    fireEvent.change(textarea, { target: { value: "Hello" } });
+    fireEvent.click(screen.getByText("Send"));
+    expect(mockSendMessage).toHaveBeenCalledWith("Hello");
+  });
+
+  it("sends message on Enter key", () => {
+    mockSendMessage.mockReturnValue({});
+    render(<ChatPanel />);
+    const textarea = screen.getByPlaceholderText("Type a message...");
+    fireEvent.change(textarea, { target: { value: "Hello" } });
+    fireEvent.keyDown(textarea, { key: "Enter", shiftKey: false });
+    expect(mockSendMessage).toHaveBeenCalledWith("Hello");
+  });
+
+  it("does not send on Shift+Enter", () => {
+    render(<ChatPanel />);
+    const textarea = screen.getByPlaceholderText("Type a message...");
+    fireEvent.change(textarea, { target: { value: "Hello" } });
+    fireEvent.keyDown(textarea, { key: "Enter", shiftKey: true });
+    expect(mockSendMessage).not.toHaveBeenCalled();
+  });
+
+  it("does not send empty messages", () => {
+    render(<ChatPanel />);
+    fireEvent.click(screen.getByText("Send"));
+    expect(mockSendMessage).not.toHaveBeenCalled();
+  });
+
+  it("shows error from sendMessage", () => {
+    mockSendMessage.mockReturnValue({ error: "Message too long" });
+    render(<ChatPanel />);
+    const textarea = screen.getByPlaceholderText("Type a message...");
+    fireEvent.change(textarea, { target: { value: "Hello" } });
+    fireEvent.click(screen.getByText("Send"));
+    expect(screen.getByText("Message too long")).toBeInTheDocument();
+  });
+
+  it("calls toggleChat on close button", () => {
+    render(<ChatPanel />);
+    fireEvent.click(screen.getByText("×"));
+    expect(mockToggleChat).toHaveBeenCalled();
+  });
+});
diff --git a/src/components/ChatToggleButton.test.tsx b/src/components/ChatToggleButton.test.tsx
new file mode 100644
index 0000000..8ba0bee
--- /dev/null
+++ b/src/components/ChatToggleButton.test.tsx
@@ -0,0 +1,92 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen, fireEvent } from "@testing-library/react";
+import React from "react";
+
+const mockToggleChat = vi.fn();
+
+vi.mock("amazon-chime-sdk-component-library-react", () => ({
+  Chat: () => <span>chat-icon</span>,
+  ControlBarButton: ({
+    label,
+    onClick,
+  }: {
+    label: string;
+    onClick: () => void;
+  }) => (
+    <button onClick={onClick} data-testid="chat-toggle">
+      {label}
+    </button>
+  ),
+}));
+
+vi.mock("../context/ChatContext", () => ({
+  ChatContext: React.createContext(null),
+}));
+
+import { ChatContext } from "../context/ChatContext";
+import ChatToggleButton from "./ChatToggleButton";
+
+describe("ChatToggleButton", () => {
+  it("renders nothing when no context", () => {
+    const { container } = render(<ChatToggleButton />);
+    expect(container.innerHTML).toBe("");
+  });
+
+  it("renders Chat label when no unread", () => {
+    render(
+      <ChatContext.Provider
+        value={{
+          messages: [],
+          sendMessage: vi.fn().mockReturnValue({}),
+          sendReaction: vi.fn(),
+          unreadCount: 0,
+          isChatOpen: false,
+          toggleChat: mockToggleChat,
+          resetUnread: vi.fn(),
+        }}
+      >
+        <ChatToggleButton />
+      </ChatContext.Provider>,
+    );
+    expect(screen.getByText("Chat")).toBeInTheDocument();
+  });
+
+  it("renders unread count in label", () => {
+    render(
+      <ChatContext.Provider
+        value={{
+          messages: [],
+          sendMessage: vi.fn().mockReturnValue({}),
+          sendReaction: vi.fn(),
+          unreadCount: 3,
+          isChatOpen: false,
+          toggleChat: mockToggleChat,
+          resetUnread: vi.fn(),
+        }}
+      >
+        <ChatToggleButton />
+      </ChatContext.Provider>,
+    );
+    expect(screen.getByText("Chat (3)")).toBeInTheDocument();
+  });
+
+  it("calls toggleChat on click", () => {
+    render(
+      <ChatContext.Provider
+        value={{
+          messages: [],
+          sendMessage: vi.fn().mockReturnValue({}),
+          sendReaction: vi.fn(),
+          unreadCount: 0,
+          isChatOpen: false,
+          toggleChat: mockToggleChat,
+          resetUnread: vi.fn(),
+        }}
+      >
+        <ChatToggleButton />
+      </ChatContext.Provider>,
+    );
+    fireEvent.click(screen.getByTestId("chat-toggle"));
+    expect(mockToggleChat).toHaveBeenCalled();
+  });
+});
diff --git a/src/components/MeetingControlBar.test.tsx b/src/components/MeetingControlBar.test.tsx
new file mode 100644
index 0000000..d3268bb
--- /dev/null
+++ b/src/components/MeetingControlBar.test.tsx
@@ -0,0 +1,122 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { render, screen, fireEvent } from "@testing-library/react";
+
+const mockLeave = vi.fn();
+const mockToggleContentShare = vi.fn();
+const mockHandleRecord = vi.fn();
+const mockHandleDownloadRecording = vi.fn();
+
+let mockAudioVideo: object | null = {};
+
+vi.mock("amazon-chime-sdk-component-library-react", () => ({
+  useAudioVideo: () => mockAudioVideo,
+  useMeetingManager: () => ({ leave: mockLeave }),
+  ControlBar: ({ children }: { children: React.ReactNode }) => (
+    <div data-testid="control-bar">{children}</div>
+  ),
+  ControlBarButton: ({
+    label,
+    onClick,
+  }: {
+    label: React.ReactNode;
+    onClick: () => void;
+  }) => (
+    <button onClick={onClick} data-testid={`btn-${typeof label === "string" ? label : "custom"}`}>
+      {typeof label === "string" ? label : "custom"}
+    </button>
+  ),
+  LeaveMeeting: () => <span>leave-icon</span>,
+  AudioInputControl: () => <div data-testid="audio-input" />,
+  VideoInputControl: () => <div data-testid="video-input" />,
+  AudioOutputControl: () => <div data-testid="audio-output" />,
+  useContentShareControls: () => ({
+    toggleContentShare: mockToggleContentShare,
+  }),
+  ScreenShare: () => <span>screen-icon</span>,
+  Record: () => <span>record-icon</span>,
+  Pause: () => <span>pause-icon</span>,
+  Play: () => <span>play-icon</span>,
+  Dots: () => <span>dots-icon</span>,
+}));
+
+vi.mock("@aws-amplify/ui-react", () => ({
+  Loader: () => <span>loader-icon</span>,
+  Text: ({ children }: { children: React.ReactNode }) => <span>{children}</span>,
+}));
+
+vi.mock("../hooks/useRecording", () => ({
+  useRecording: () => ({
+    recordingLabel: "Record",
+    iconType: "record",
+    clickAction: "toggle",
+    handleRecord: mockHandleRecord,
+    handleDownloadRecording: mockHandleDownloadRecording,
+  }),
+}));
+
+vi.mock("./ChatToggleButton", () => ({
+  default: () => <div data-testid="chat-toggle">Chat</div>,
+}));
+
+vi.mock("./EditNameButton", () => ({
+  EditNameButton: ({ attendeeName }: { attendeeName: string }) => (
+    <div data-testid="edit-name">{attendeeName}</div>
+  ),
+}));
+
+import MeetingControlBar from "./MeetingControlBar";
+
+describe("MeetingControlBar", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockAudioVideo = {};
+  });
+
+  it("renders nothing when audioVideo is null", () => {
+    mockAudioVideo = null;
+    const { container } = render(<MeetingControlBar />);
+    expect(container.innerHTML).toBe("");
+  });
+
+  it("renders control bar when audioVideo is available", () => {
+    render(<MeetingControlBar />);
+    expect(screen.getByTestId("control-bar")).toBeInTheDocument();
+  });
+
+  it("calls leave on Leave button click", () => {
+    render(<MeetingControlBar />);
+    fireEvent.click(screen.getByTestId("btn-Leave"));
+    expect(mockLeave).toHaveBeenCalled();
+  });
+
+  it("calls toggleContentShare on Share button click", () => {
+    render(<MeetingControlBar />);
+    fireEvent.click(screen.getByTestId("btn-Share"));
+    expect(mockToggleContentShare).toHaveBeenCalled();
+  });
+
+  it("renders ChatToggleButton", () => {
+    render(<MeetingControlBar />);
+    expect(screen.getByTestId("chat-toggle")).toBeInTheDocument();
+  });
+
+  it("shows more controls panel on More button click", () => {
+    render(<MeetingControlBar attendeeName="Alice" onNameChange={vi.fn()} />);
+    fireEvent.click(screen.getByTestId("btn-More"));
+    expect(screen.getByTestId("audio-output")).toBeInTheDocument();
+    expect(screen.getByTestId("edit-name")).toBeInTheDocument();
+  });
+
+  it("calls handleRecord from more panel", () => {
+    render(<MeetingControlBar />);
+    fireEvent.click(screen.getByTestId("btn-More"));
+    fireEvent.click(screen.getByTestId("btn-custom"));
+    expect(mockHandleRecord).toHaveBeenCalled();
+  });
+
+  it("renders audio and video controls", () => {
+    render(<MeetingControlBar />);
+    expect(screen.getByTestId("audio-input")).toBeInTheDocument();
+    expect(screen.getByTestId("video-input")).toBeInTheDocument();
+  });
+});
diff --git a/src/components/VideoMeeting.test.tsx b/src/components/VideoMeeting.test.tsx
new file mode 100644
index 0000000..cee54d0
--- /dev/null
+++ b/src/components/VideoMeeting.test.tsx
@@ -0,0 +1,57 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+
+const mockUseVideoMeeting = vi.fn();
+
+vi.mock("amazon-chime-sdk-component-library-react", () => ({
+  LocalVideo: ({ nameplate }: { nameplate: string }) => (
+    <div data-testid="local-video">{nameplate}</div>
+  ),
+  RemoteVideo: ({ tileId, name }: { tileId: number; name: string }) => (
+    <div data-testid={`remote-video-${tileId}`}>{name}</div>
+  ),
+  useLocalVideo: () => ({ isVideoEnabled: true }),
+  useRemoteVideoTileState: () => ({
+    tiles: [1, 2],
+    tileIdToAttendeeId: { 1: "attendee-a", 2: "attendee-b" },
+  }),
+  useRosterState: () => ({
+    roster: { "attendee-a": { name: "Alice" }, "attendee-b": { name: "Bob" } },
+  }),
+}));
+
+vi.mock("../context/AttendeeNamesContext", () => ({
+  useAttendeeNamesContext: () => ({
+    getAttendeeName: (id: string) => `Name-${id}`,
+  }),
+}));
+
+vi.mock("../hooks/useVideoMeeting", () => ({
+  useVideoMeeting: () => mockUseVideoMeeting(),
+}));
+
+import VideoMeeting from "./VideoMeeting";
+
+describe("VideoMeeting", () => {
+  it("renders local video when enabled", () => {
+    render(<VideoMeeting />);
+    expect(screen.getByTestId("local-video")).toBeInTheDocument();
+  });
+
+  it("renders remote video tiles", () => {
+    render(<VideoMeeting />);
+    expect(screen.getByTestId("remote-video-1")).toBeInTheDocument();
+    expect(screen.getByTestId("remote-video-2")).toBeInTheDocument();
+  });
+
+  it("displays attendee names on remote tiles", () => {
+    render(<VideoMeeting />);
+    expect(screen.getByText("Name-attendee-a")).toBeInTheDocument();
+    expect(screen.getByText("Name-attendee-b")).toBeInTheDocument();
+  });
+
+  it("calls useVideoMeeting hook", () => {
+    render(<VideoMeeting />);
+    expect(mockUseVideoMeeting).toHaveBeenCalled();
+  });
+});
diff --git a/src/context/AttendeeNamesContext.test.tsx b/src/context/AttendeeNamesContext.test.tsx
index ea8c246..beb82e1 100644
--- a/src/context/AttendeeNamesContext.test.tsx
+++ b/src/context/AttendeeNamesContext.test.tsx
@@ -125,6 +125,34 @@ describe("AttendeeNamesContext", () => {
     );
   });
 
+  it("getAttendeeName falls back to externalUserId prefix when no name", () => {
+    mockRoster["attendee-789"] = { externalUserId: "Charlie#789" };
+    const { result } = renderHook(() => useAttendeeNamesContext(), { wrapper });
+    expect(result.current.getAttendeeName("attendee-789")).toBe("Charlie");
+    delete mockRoster["attendee-789"];
+  });
+
+  it("getAttendeeName returns Unknown when no roster entry at all", () => {
+    const { result } = renderHook(() => useAttendeeNamesContext(), { wrapper });
+    expect(result.current.getAttendeeName("no-such-id")).toBe("Unknown");
+  });
+
+  it("broadcastNameChange is no-op when attendeeId is empty", () => {
+    mockMeetingManager.meetingSessionConfiguration = {
+      credentials: { attendeeId: "" },
+    };
+    const { result } = renderHook(() => useAttendeeNamesContext(), { wrapper });
+
+    act(() => {
+      result.current.broadcastNameChange("NewName");
+    });
+
+    expect(mockAudioVideo.realtimeSendDataMessage).not.toHaveBeenCalled();
+    mockMeetingManager.meetingSessionConfiguration = {
+      credentials: { attendeeId: "attendee-123" },
+    };
+  });
+
   it("throws when used outside provider", () => {
     expect(() => {
       renderHook(() => useAttendeeNamesContext());
diff --git a/src/hooks/useChat.test.ts b/src/hooks/useChat.test.ts
index c0ec388..45084fc 100644
--- a/src/hooks/useChat.test.ts
+++ b/src/hooks/useChat.test.ts
@@ -249,6 +249,88 @@ describe("useChat", () => {
     }).not.toThrow();
   });
 
+  it("deduplicates incoming messages with the same messageId", () => {
+    const { result } = renderHook(() => useChat());
+
+    const chatMessageCallback =
+      mockRealtimeSubscribeToReceiveDataMessage.mock.calls.find(
+        (call) => call[0] === "chat-message",
+      )?.[1];
+
+    const payload = {
+      senderName: "User",
+      message: "Hello",
+      messageId: "dup-1",
+      timestamp: 1000,
+    };
+
+    act(() => {
+      chatMessageCallback(createDataMessage("chat-message", payload));
+    });
+    act(() => {
+      chatMessageCallback(createDataMessage("chat-message", payload));
+    });
+
+    expect(result.current.messages).toHaveLength(1);
+  });
+
+  it("toggling a reaction removes it when already present", () => {
+    const { result } = renderHook(() => useChat());
+
+    act(() => {
+      result.current.sendMessage("Hello");
+    });
+
+    const messageId = result.current.messages[0].id;
+
+    act(() => {
+      result.current.sendReaction(messageId, "\u{1F44D}");
+    });
+    expect(result.current.messages[0].reactions["\u{1F44D}"]).toEqual(["Test User"]);
+
+    act(() => {
+      result.current.sendReaction(messageId, "\u{1F44D}");
+    });
+    expect(result.current.messages[0].reactions["\u{1F44D}"]).toBeUndefined();
+  });
+
+  it("incoming reaction toggle removes sender when already reacted", () => {
+    const { result } = renderHook(() => useChat());
+
+    act(() => {
+      result.current.sendMessage("Hello");
+    });
+    const messageId = result.current.messages[0].id;
+
+    const reactionCallback =
+      mockRealtimeSubscribeToReceiveDataMessage.mock.calls.find(
+        (call) => call[0] === "chat-reaction",
+      )?.[1];
+
+    const payload = { messageId, emoji: "\u{1F525}", senderName: "Bob" };
+
+    act(() => {
+      reactionCallback(createDataMessage("chat-reaction", payload));
+    });
+    expect(result.current.messages[0].reactions["\u{1F525}"]).toEqual(["Bob"]);
+
+    act(() => {
+      reactionCallback(createDataMessage("chat-reaction", payload));
+    });
+    expect(result.current.messages[0].reactions["\u{1F525}"]).toBeUndefined();
+  });
+
+  it("sendMessage does not add message when text is empty", () => {
+    const { result } = renderHook(() => useChat());
+
+    act(() => {
+      result.current.sendMessage("   ");
+    });
+
+    expect(mockRealtimeSendDataMessage).not.toHaveBeenCalled();
+    expect(result.current.messages).toHaveLength(0);
+  });
+
   it("handleChatReaction drops malformed payloads without crashing", () => {
     renderHook(() => useChat());
 
diff --git a/src/test/amplify-outputs-mock.json b/src/test/amplify-outputs-mock.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/src/test/amplify-outputs-mock.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/src/test/setup.ts b/src/test/setup.ts
index f149f27..d6780ee 100644
--- a/src/test/setup.ts
+++ b/src/test/setup.ts
@@ -1 +1,3 @@
 import "@testing-library/jest-dom/vitest";
+
+Element.prototype.scrollIntoView = () => {};
diff --git a/vite.config.ts b/vite.config.ts
index 0fe068b..c3c7348 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,6 +1,15 @@
 /// <reference types="vitest" />
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
+import path from "path";
+import { existsSync } from "fs";
+
+const amplifyOutputsPath = path.resolve(__dirname, "amplify_outputs.json");
+const amplifyMockPath = path.resolve(
+  __dirname,
+  "src/test/amplify-outputs-mock.json",
+);
+const needsAmplifyMock = !existsSync(amplifyOutputsPath);
 
 // https://vitejs.dev/config/
 export default defineConfig({
@@ -10,7 +19,18 @@ export default defineConfig({
     // necessary for chime lib to work
     global: {},
   },
+  resolve: {
+    alias: needsAmplifyMock
+      ? { "../amplify_outputs.json": amplifyMockPath }
+      : {},
+  },
   test: {
+    alias: {
+      "../amplify_outputs.json": path.resolve(
+        __dirname,
+        "src/test/amplify-outputs-mock.json",
+      ),
+    },
     globals: true,
     environment: "jsdom",
     setupFiles: ["./src/test/setup.ts"],
@@ -24,19 +44,12 @@ export default defineConfig({
         "src/test/**",
         "src/vite-env.d.ts",
         "src/main.tsx",
-        "src/App.tsx",
-        "src/components/MeetingControlBar.tsx",
-        "src/components/VideoMeeting.tsx",
-        "src/components/AttendeeList.tsx",
-        "src/components/ChatPanel.tsx",
-        "src/components/ChatMessage.tsx",
-        "src/components/ChatToggleButton.tsx",
       ],
       thresholds: {
-        branches: 80,
-        functions: 80,
-        lines: 80,
-        statements: 80,
+        branches: 90,
+        functions: 90,
+        lines: 90,
+        statements: 90,
       },
     },
   },