시리즈

[flutter] noSuchMethod

20220503
class
dart
dio
fake
flutter
mock
nosuchmethod
test

 

클래스 상속 시, 구현하고 싶지 않은 메소드와 속성이 있다면 noSuchMethod 를 사용해보자.

만약 dio 클래스 의 모킹클래스를 구현한다고 해보자.

Dio에는 총 25개의 메소드와 속성이 있는데, 우리는 이걸 다 구현할 필요는 없다.

class FakeDio implements Dio {
  @override
  Future<Response<T>> get<T>(String path,
      {Map<String, dynamic>? queryParameters,
      Options? options,
      CancelToken? cancelToken,
      ProgressCallback? onReceiveProgress}) {
    // TODO: implement get
    throw UnimplementedError();
  }
}

이렇게 get 메소드만 구현했을 때는,



빨간 줄이 그어지면서 24 개나 되는 오버라이드 안내가 뜬다.

우리가 구현하지 않은 메소드를 그대로 놔두고, 이런 메소드가 실수로 호출 되면 예외나 에러 처리를 해주면 참 좋을 것이다.

import 'package:dio/dio.dart';

class FakeDio implements Dio {
  @override
  Future<Response<T>> get<T>(String path,
      {Map<String, dynamic>? queryParameters,
      Options? options,
      CancelToken? cancelToken,
      ProgressCallback? onReceiveProgress}) {
    // TODO: implement get
    throw UnimplementedError();
  }

  @override
  void noSuchMethod(Invocation invocation) {
    throw UnimplementedError();
  }
}

get 이외의 Dio 클래스의 메소드와 속성을 호출하면 전부 noSuchMethod로 간다.

이제 쉽게 모킹 클래스를 만들 수 있다.

.

piano (press key Q)

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