group(‘localTodos’, () {
final List todos = [
const TodoModel(id: 1, title: “Test Todo 1”, completed: false, userId: 1),
const TodoModel(id: 2, title: “Test Todo 2”, completed: true, userId: 1),
];

  test('should call SharedPreferences to save the data', () async {
    final expectedJsonString = json.encode(todos.map((todo) => todo.toJson()).toList());

    print('Test setup complete');
    when(mockSharedPreferences.setString(prefKey, expectedJsonString)).thenAnswer((_) async => true);

    await localDataSource.localTodos(todos);

    print('After localTodos method call');

    // Ensure we verify setString was called once
    verify(mockSharedPreferences.setString(prefKey, expectedJsonString)).called(1);
  });
});

Was writing a test for a todo app with sharedpref