feat: add tests and assert coverage (#71)

### Explanation

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### Issue

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### Attestations

- [ ] I have read and agree to the [Code of Conduct](https://docs.nhcarrigan.com/community/coc/)
- [ ] I have read and agree to the [Community Guidelines](https://docs.nhcarrigan.com/community/guide/).
- [ ] My contribution complies with the [Contributor Covenant](https://docs.nhcarrigan.com/dev/covenant/).

### Dependencies

- [ ] I have pinned the dependencies to a specific patch version.

### Style

- [ ] I have run the linter and resolved any errors.
- [ ] My pull request uses an appropriate title, matching the conventional commit standards.
- [ ] My scope of feat/fix/chore/etc. correctly matches the nature of changes in my pull request.

### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
- [ ] My contribution modifies existing code, and I have updated the tests to reflect these changes.
- [ ] All new and existing tests pass locally with my changes.
- [ ] Code coverage remains at or above the configured threshold.

### Documentation

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### Versioning

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Co-authored-by: Hikari <hikari@nhcarrigan.com>
Reviewed-on: #71
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

vitest.setup.ts

@@ -1 +1,288 @@
 import "@testing-library/jest-dom/vitest";
+import { vi, beforeEach } from "vitest";
+
+// Mock Tauri invoke API
+const mockInvokeResults: Record<string, unknown> = {};
+
+export function setMockInvokeResult(command: string, result: unknown) {
+  mockInvokeResults[command] = result;
+}
+
+export function clearMockInvokeResults() {
+  Object.keys(mockInvokeResults).forEach((key) => delete mockInvokeResults[key]);
+}
+
+vi.mock("@tauri-apps/api/core", () => ({
+  invoke: vi.fn((command: string) => {
+    if (command in mockInvokeResults) {
+      const result = mockInvokeResults[command];
+      if (result instanceof Error) {
+        return Promise.reject(result);
+      }
+      return Promise.resolve(result);
+    }
+    // Default return values for common commands
+    switch (command) {
+      case "get_config":
+        return Promise.resolve({
+          model: null,
+          api_key: null,
+          custom_instructions: null,
+          mcp_servers_json: null,
+          auto_granted_tools: [],
+          theme: "dark",
+          greeting_enabled: true,
+          greeting_custom_prompt: null,
+          notifications_enabled: true,
+          notification_volume: 0.7,
+          always_on_top: false,
+          update_checks_enabled: true,
+          character_panel_width: null,
+          font_size: 14,
+          minimize_to_tray: false,
+          streamer_mode: false,
+          streamer_hide_paths: false,
+          compact_mode: false,
+          profile_name: null,
+          profile_avatar_path: null,
+          profile_bio: null,
+          custom_theme_colors: {},
+        });
+      case "list_quick_actions":
+        return Promise.resolve([]);
+      case "list_snippets":
+        return Promise.resolve([]);
+      case "list_sessions":
+        return Promise.resolve([]);
+      case "get_usage_stats":
+        return Promise.resolve({
+          total_messages: 0,
+          total_sessions: 0,
+          total_tokens: 0,
+          total_cost: 0,
+        });
+      case "get_persisted_stats":
+        return Promise.resolve({
+          lifetime_messages: 0,
+          lifetime_sessions: 0,
+          lifetime_tokens: 0,
+          lifetime_cost: 0,
+          achievements: [],
+          unlocked_achievements: [],
+        });
+      case "load_saved_achievements":
+        return Promise.resolve([]);
+      case "list_clipboard_entries":
+        return Promise.resolve([]);
+      case "cleanup_temp_files":
+        return Promise.resolve();
+      case "validate_directory":
+        return Promise.resolve(true);
+      case "git_status":
+        return Promise.resolve({
+          branch: "main",
+          files: [],
+          ahead: 0,
+          behind: 0,
+        });
+      default:
+        return Promise.resolve(null);
+    }
+  }),
+}));
+
+// Mock Tauri event API
+const eventListeners: Map<string, Array<(event: { payload: unknown }) => void>> = new Map();
+
+export function emitMockEvent(eventName: string, payload: unknown) {
+  const listeners = eventListeners.get(eventName) || [];
+  listeners.forEach((listener) => listener({ payload }));
+}
+
+export function clearMockEventListeners() {
+  eventListeners.clear();
+}
+
+vi.mock("@tauri-apps/api/event", () => ({
+  listen: vi.fn((eventName: string, handler: (event: { payload: unknown }) => void) => {
+    const listeners = eventListeners.get(eventName) || [];
+    listeners.push(handler);
+    eventListeners.set(eventName, listeners);
+    // Return an unlisten function
+    return Promise.resolve(() => {
+      const currentListeners = eventListeners.get(eventName) || [];
+      const index = currentListeners.indexOf(handler);
+      if (index > -1) {
+        currentListeners.splice(index, 1);
+      }
+    });
+  }),
+  emit: vi.fn(),
+}));
+
+// Mock Tauri plugins
+vi.mock("@tauri-apps/plugin-dialog", () => ({
+  save: vi.fn(() => Promise.resolve(null)),
+  open: vi.fn(() => Promise.resolve(null)),
+  message: vi.fn(() => Promise.resolve()),
+  ask: vi.fn(() => Promise.resolve(true)),
+  confirm: vi.fn(() => Promise.resolve(true)),
+}));
+
+vi.mock("@tauri-apps/plugin-fs", () => ({
+  writeTextFile: vi.fn(() => Promise.resolve()),
+  readTextFile: vi.fn(() => Promise.resolve("{}")),
+  exists: vi.fn(() => Promise.resolve(false)),
+  mkdir: vi.fn(() => Promise.resolve()),
+  remove: vi.fn(() => Promise.resolve()),
+  readDir: vi.fn(() => Promise.resolve([])),
+}));
+
+vi.mock("@tauri-apps/plugin-opener", () => ({
+  openPath: vi.fn(() => Promise.resolve()),
+  openUrl: vi.fn(() => Promise.resolve()),
+}));
+
+vi.mock("@tauri-apps/plugin-notification", () => ({
+  sendNotification: vi.fn(() => Promise.resolve()),
+  requestPermission: vi.fn(() => Promise.resolve("granted")),
+  isPermissionGranted: vi.fn(() => Promise.resolve(true)),
+}));
+
+vi.mock("@tauri-apps/plugin-clipboard-manager", () => ({
+  writeText: vi.fn(() => Promise.resolve()),
+  readText: vi.fn(() => Promise.resolve("")),
+  writeImage: vi.fn(() => Promise.resolve()),
+  readImage: vi.fn(() => Promise.resolve(null)),
+}));
+
+vi.mock("@tauri-apps/plugin-os", () => ({
+  platform: vi.fn(() => Promise.resolve("linux")),
+  arch: vi.fn(() => Promise.resolve("x86_64")),
+  type: vi.fn(() => Promise.resolve("Linux")),
+  version: vi.fn(() => Promise.resolve("1.0.0")),
+}));
+
+vi.mock("@tauri-apps/plugin-http", () => ({
+  fetch: vi.fn(() =>
+    Promise.resolve({
+      ok: true,
+      status: 200,
+      json: () => Promise.resolve({}),
+      text: () => Promise.resolve(""),
+    })
+  ),
+}));
+
+// Mock browser APIs
+class MockAudioElement {
+  src = "";
+  volume = 1;
+  loop = false;
+  currentTime = 0;
+  paused = true;
+  preload = "auto";
+  onloadeddata: (() => void) | null = null;
+  onended: (() => void) | null = null;
+  onerror: ((e: Event) => void) | null = null;
+
+  play() {
+    this.paused = false;
+    return Promise.resolve();
+  }
+
+  pause() {
+    this.paused = true;
+  }
+
+  load() {
+    if (this.onloadeddata) {
+      setTimeout(() => this.onloadeddata?.(), 0);
+    }
+  }
+
+  addEventListener(event: string, handler: () => void) {
+    if (event === "loadeddata") this.onloadeddata = handler;
+    if (event === "ended") this.onended = handler;
+  }
+
+  removeEventListener() {
+    // No-op for tests
+  }
+}
+
+// @ts-expect-error - Mock Audio constructor
+globalThis.Audio = MockAudioElement;
+
+// Mock localStorage
+const localStorageStore: Record<string, string> = {};
+
+Object.defineProperty(globalThis, "localStorage", {
+  value: {
+    getItem: vi.fn((key: string) => localStorageStore[key] || null),
+    setItem: vi.fn((key: string, value: string) => {
+      localStorageStore[key] = value;
+    }),
+    removeItem: vi.fn((key: string) => {
+      delete localStorageStore[key];
+    }),
+    clear: vi.fn(() => {
+      Object.keys(localStorageStore).forEach((key) => delete localStorageStore[key]);
+    }),
+    key: vi.fn((index: number) => Object.keys(localStorageStore)[index] || null),
+    get length() {
+      return Object.keys(localStorageStore).length;
+    },
+  },
+  writable: true,
+});
+
+// Mock matchMedia
+Object.defineProperty(globalThis, "matchMedia", {
+  writable: true,
+  value: vi.fn((query: string) => ({
+    matches: query.includes("dark"),
+    media: query,
+    onchange: null,
+    addListener: vi.fn(),
+    removeListener: vi.fn(),
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+    dispatchEvent: vi.fn(),
+  })),
+});
+
+// Mock ResizeObserver
+class MockResizeObserver {
+  observe = vi.fn();
+  unobserve = vi.fn();
+  disconnect = vi.fn();
+}
+
+globalThis.ResizeObserver = MockResizeObserver as unknown as typeof ResizeObserver;
+
+// Mock IntersectionObserver
+class MockIntersectionObserver {
+  observe = vi.fn();
+  unobserve = vi.fn();
+  disconnect = vi.fn();
+}
+
+globalThis.IntersectionObserver =
+  MockIntersectionObserver as unknown as typeof IntersectionObserver;
+
+// Mock requestAnimationFrame
+globalThis.requestAnimationFrame = vi.fn((callback) => {
+  return setTimeout(callback, 0) as unknown as number;
+});
+
+globalThis.cancelAnimationFrame = vi.fn((id) => {
+  clearTimeout(id);
+});
+
+// Reset all mocks before each test
+beforeEach(() => {
+  vi.clearAllMocks();
+  clearMockInvokeResults();
+  clearMockEventListeners();
+});