diff --git a/src/main.test.ts b/src/main.test.ts
new file mode 100644
index 0000000..4392abb
--- /dev/null
+++ b/src/main.test.ts
@@ -0,0 +1,127 @@
+import { test, vi, expect } from "vitest";
+
+vi.mock("./ui/editor", () => ({
+    SumEditor: vi.fn().mockImplementation(() => ({
+        goToLine: vi.fn(),
+        getSheetWithResults: vi.fn(() => "test-results"),
+        getText: vi.fn(() => "test"),
+        focus: vi.fn(),
+        refresh: vi.fn(),
+    }))
+}));
+
+vi.mock("@tauri-apps/api/core", () => ({
+    invoke: vi.fn(() => Promise.resolve(false)),
+}));
+
+vi.mock("@tauri-apps/api/window", () => ({
+    getCurrentWindow: vi.fn(() => ({
+        minimize: vi.fn(),
+        hide: vi.fn(),
+        show: vi.fn(),
+    })),
+}));
+
+vi.mock("./storage", async (importOriginal) => {
+    const actual = await importOriginal();
+    return {
+        ...actual as object,
+        isTauri: vi.fn(() => false),
+        loadSettings: vi.fn(() => ({ language: "en", autostart: false, alwaysOnTop: false, autoUpdateEnabled: false, sidebarVisible: false, hotkey: "CmdOrCtrl+Space" })),
+        loadAppData: vi.fn(() => ({ docs: [{id: "1", title: "Test"}], contents: {}, activeId: "1" })),
+        saveSettings: vi.fn(),
+        saveAppData: vi.fn(),
+        getLaunchFile: vi.fn(() => null),
+        flushAppData: vi.fn(),
+        onAppQuit: vi.fn((_cb: any) => {}),
+        onOpenFile: vi.fn(),
+        onFileDrop: vi.fn(),
+        registerHotkey: vi.fn(() => Promise.resolve(true)),
+        applyAutostart: vi.fn(),
+        applyAlwaysOnTop: vi.fn(),
+        fetchRates: vi.fn(),
+        fetchMarketData: vi.fn(),
+        loadExtensionScripts: vi.fn(() => Promise.resolve([])),
+    };
+});
+
+vi.mock("./ui/search", () => ({
+    initSearch: vi.fn(() => ({ open: vi.fn() }))
+}));
+
+vi.mock("./updater", () => ({
+    checkForUpdate: vi.fn(() => Promise.resolve(null))
+}));
+
+vi.mock("./extensions", () => ({
+    runExtensions: vi.fn(() => Promise.resolve())
+}));
+
+test("boot application", async () => {
+    const createMockElement = () => ({
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        classList: { add: vi.fn(), remove: vi.fn(), toggle: vi.fn(), contains: vi.fn() },
+        style: { setProperty: vi.fn() },
+        dataset: {},
+        value: "",
+        appendChild: vi.fn(),
+        setAttribute: vi.fn(),
+        getBoundingClientRect: vi.fn(() => ({ right: 100, width: 100 })),
+        closest: vi.fn(),
+        blur: vi.fn(),
+        replaceChildren: vi.fn(),
+    });
+
+    const mock$ = vi.fn(createMockElement);
+
+    vi.stubGlobal("document", {
+        querySelector: mock$,
+        querySelectorAll: vi.fn(() => []), // For i18n
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        body: createMockElement(),
+        documentElement: createMockElement(),
+        createElement: vi.fn(createMockElement),
+        createElementNS: vi.fn(createMockElement),
+        createDocumentFragment: vi.fn(createMockElement),
+        head: createMockElement(),
+    });
+
+    vi.stubGlobal("window", {
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        performance: { now: () => 0 },
+        print: vi.fn(),
+        getSelection: vi.fn(() => null),
+        setInterval: vi.fn(),
+        setTimeout: vi.fn().mockImplementation((cb: Function) => cb()),
+        dispatchEvent: vi.fn(),
+        CustomEvent: vi.fn(),
+    });
+
+    vi.stubGlobal("matchMedia", vi.fn(() => ({
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        matches: false,
+    })));
+
+    vi.stubGlobal("navigator", {
+        clipboard: { writeText: vi.fn() },
+        language: "en",
+    });
+
+    vi.stubGlobal("localStorage", {
+        getItem: vi.fn(() => null),
+        setItem: vi.fn(),
+    });
+
+    // Import main and wait for boot to complete
+    await import("./main");
+    await new Promise(r => setTimeout(r, 0));
+
+    // As mock is hoisted, we can import actual mocked funcs
+    const { loadSettings, loadAppData } = await import("./storage");
+    expect(loadSettings).toHaveBeenCalled();
+    expect(loadAppData).toHaveBeenCalled();
+});