test: add storage functions tests

Co-authored-by: Horizontal42 <75383519+Horizontal42@users.noreply.github.com>

src/storage.test.ts

@@ -0,0 +1,96 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { isTauri, loadSettings, saveSettings, defaultSettingsData } from './storage';
+import { invoke } from '@tauri-apps/api/core';
+
+vi.mock('@tauri-apps/api/core', () => ({
+  invoke: vi.fn(),
+}));
+
+describe('storage', () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+    vi.stubGlobal('window', {});
+    vi.stubGlobal('localStorage', {
+      getItem: vi.fn(),
+      setItem: vi.fn(),
+    });
+    vi.stubGlobal('console', { warn: vi.fn() });
+  });
+
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  describe('isTauri', () => {
+    it('returns false when not in Tauri', () => {
+      expect(isTauri()).toBe(false);
+    });
+
+    it('returns true when in Tauri', () => {
+      vi.stubGlobal('window', { __TAURI_INTERNALS__: {} });
+      expect(isTauri()).toBe(true);
+    });
+  });
+
+  describe('loadSettings', () => {
+    it('loads from localStorage when not in Tauri', async () => {
+      vi.mocked(localStorage.getItem).mockReturnValue(JSON.stringify({ precision: 5 }));
+      const settings = await loadSettings();
+      expect(localStorage.getItem).toHaveBeenCalledWith('summarum.settings');
+      expect(settings.precision).toBe(5);
+      expect(settings.theme).toBe(defaultSettingsData.theme);
+    });
+
+    it('loads via invoke when in Tauri', async () => {
+      vi.stubGlobal('window', { __TAURI_INTERNALS__: {} });
+      vi.mocked(invoke).mockResolvedValue(JSON.stringify({ precision: 8 }));
+      const settings = await loadSettings();
+      expect(invoke).toHaveBeenCalledWith('load_file', { name: 'settings.json' });
+      expect(settings.precision).toBe(8);
+      expect(settings.theme).toBe(defaultSettingsData.theme);
+    });
+
+    it('falls back to defaultSettingsData if localStorage throws', async () => {
+      vi.mocked(localStorage.getItem).mockImplementation(() => { throw new Error('localStorage error'); });
+      const settings = await loadSettings();
+      expect(console.warn).toHaveBeenCalledWith('loadSettings failed', expect.any(Error));
+      expect(settings).toEqual(defaultSettingsData);
+    });
+
+    it('falls back to defaultSettingsData if invoke throws', async () => {
+      vi.stubGlobal('window', { __TAURI_INTERNALS__: {} });
+      vi.mocked(invoke).mockRejectedValue(new Error('invoke error'));
+      const settings = await loadSettings();
+      expect(console.warn).toHaveBeenCalledWith('loadSettings failed', expect.any(Error));
+      expect(settings).toEqual(defaultSettingsData);
+    });
+
+    it('falls back to defaultSettingsData if localStorage returns null', async () => {
+      vi.mocked(localStorage.getItem).mockReturnValue(null);
+      const settings = await loadSettings();
+      expect(settings).toEqual(defaultSettingsData);
+    });
+
+    it('falls back to defaultSettingsData if JSON is invalid', async () => {
+      vi.mocked(localStorage.getItem).mockReturnValue("invalid json");
+      const settings = await loadSettings();
+      expect(console.warn).toHaveBeenCalledWith('loadSettings failed', expect.any(Error));
+      expect(settings).toEqual(defaultSettingsData);
+    });
+  });
+
+  describe('saveSettings', () => {
+    it('saves to localStorage when not in Tauri', async () => {
+      const settings = { ...defaultSettingsData, precision: 10 };
+      await saveSettings(settings);
+      expect(localStorage.setItem).toHaveBeenCalledWith('summarum.settings', JSON.stringify(settings, null, 2));
+    });
+
+    it('saves via invoke when in Tauri', async () => {
+      vi.stubGlobal('window', { __TAURI_INTERNALS__: {} });
+      const settings = { ...defaultSettingsData, precision: 12 };
+      await saveSettings(settings);
+      expect(invoke).toHaveBeenCalledWith('save_file', { name: 'settings.json', contents: JSON.stringify(settings, null, 2) });
+    });
+  });
+});