First working POC

src/test/mocks/app-environment.ts

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+// Mock for $app/environment
+export const browser = true;
+export const dev = false;
+export const building = false;
+export const version = "test";

src/test/mocks/app-navigation.ts

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+// Mock for $app/navigation
+import { vi } from "vitest";
+
+export const goto = vi.fn();
+export const invalidate = vi.fn();
+export const invalidateAll = vi.fn();
+export const preloadData = vi.fn();
+export const preloadCode = vi.fn();
+export const beforeNavigate = vi.fn();
+export const afterNavigate = vi.fn();
+export const disableScrollHandling = vi.fn();

src/test/mocks/app-stores.ts

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+// Mock for $app/stores
+import { writable, readable } from "svelte/store";
+
+export const page = readable({
+  url: new URL("http://localhost"),
+  params: {},
+  route: { id: "/" },
+  status: 200,
+  error: null,
+  data: {},
+  form: null,
+});
+
+export const navigating = readable(null);
+
+export const updated = {
+  subscribe: readable(false).subscribe,
+  check: async () => false,
+};

src/test/setup-globals.ts

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+// Global setup that runs before any other setup
+// This file must be loaded first to set up the window object
+
+// Setup jsdom/happy-dom globals
+// The test environment should provide window and document
+if (typeof window !== "undefined") {
+  // Setup Tauri internals on window
+  Object.defineProperty(window, "__TAURI_OS_PLUGIN_INTERNALS__", {
+    writable: true,
+    configurable: true,
+    enumerable: true,
+    value: {
+      platform: "linux",
+    },
+  });
+}
+
+// Ensure document and window are available as globals (not just on globalThis)
+if (typeof globalThis !== "undefined") {
+  if (typeof window !== "undefined" && !(global as any).window) {
+    (global as any).window = window;
+  }
+
+  if (typeof document !== "undefined" && !(global as any).document) {
+    (global as any).document = document;
+  }
+
+  // Also ensure they're on globalThis
+  if (typeof window !== "undefined" && !globalThis.window) {
+    (globalThis as any).window = window;
+  }
+
+  if (typeof document !== "undefined" && !globalThis.document) {
+    (globalThis as any).document = document;
+  }
+}

src/test/setup.ts

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+// Test setup file for Vitest
+
+import { vi } from "vitest";
+
+// Setup window.__TAURI_OS_PLUGIN_INTERNALS__ before any imports
+if (typeof window !== "undefined") {
+  Object.defineProperty(window, "__TAURI_OS_PLUGIN_INTERNALS__", {
+    writable: true,
+    configurable: true,
+    value: {
+      platform: "linux",
+    },
+  });
+}
+
+// Mock SvelteKit environment
+vi.mock("$app/environment", () => ({
+  browser: true,
+  dev: false,
+  building: false,
+  version: "test",
+}));
+
+// Mock Tauri API
+vi.mock("@tauri-apps/api/core", () => ({
+  invoke: vi.fn(),
+}));
+
+// Mock Tauri event API
+vi.mock("@tauri-apps/api/event", () => ({
+  listen: vi.fn(),
+  emit: vi.fn(),
+}));
+
+// Mock Tauri OS plugin
+vi.mock("@tauri-apps/plugin-os", () => ({
+  platform: vi.fn(() => "linux"),
+}));
+
+// Setup global test utilities
+global.ResizeObserver = vi.fn().mockImplementation(() => ({
+  observe: vi.fn(),
+  unobserve: vi.fn(),
+  disconnect: vi.fn(),
+}));
+
+// Mock window.matchMedia
+Object.defineProperty(window, "matchMedia", {
+  writable: true,
+  value: vi.fn().mockImplementation((query) => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: vi.fn(),
+    removeListener: vi.fn(),
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+    dispatchEvent: vi.fn(),
+  })),
+});