add jest mocking for settings.

components/ui/__tests__/Settings.spec.tsx

@@ -41,6 +41,7 @@ jest.mock("@/app/i18n/api", () => {
   };
 });
 
+
 describe("SettingsComponent", () => {
   let db: Knex;
   let settings: Settings;
@@ -48,16 +49,18 @@ describe("SettingsComponent", () => {
   beforeEach(async () => {
     db = await getDb("development");
     settings = new Settings(db);
+    jest.spyOn(Settings, 'getDefault').mockResolvedValue(settings);
     await settings.setHostLanguage("en");
     await settings.setLibretranslateBaseUrl("https://example.com");
   });
 
   afterEach(async () => {
+    jest.restoreAllMocks();
     await db.migrate.down();
     await db.destroy();
   });
 
-  beforeAll(() => {
+  beforeAll(async () => {
     jest.useFakeTimers();
   });