test: Sync mocks

Co-Authored-By: Natalia Rodrigues <Natytotherodrigues@gmail.com>

src/app/__tests__/watermelon.service.spec.tsx

@@ -0,0 +1,19 @@
+import { synchronize } from '@nozbe/watermelondb/sync';
+import AsyncStorage from '@react-native-async-storage/async-storage';
+import { syncDatabaseWithServer } from '../services/watermelon.service'; 
+
+jest.mock('@nozbe/watermelondb/sync', () => ({
+  synchronize: jest.fn()
+}));
+
+jest.mock('@react-native-async-storage/async-storage', () => ({
+  getItem: jest.fn()
+}));
+
+global.fetch = jest.fn();
+
+describe('syncDatabaseWithServer', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+});