飞镖中子类的单元测试

Question

我能够为父类编写单元测试，但我被困在子类上。如何编写子类的单元测试。

class Parent {

  SomeService _someService;
  SomeService get someService => _someService;
  
  Parent() {
    this._someService = SomeService();
  }
  
  Parent.withService(this._someService);

  Map<String, dynamic> getResult() {

    return _someService.getResult();
  }
}

class Child extends Parent {
  
  int useResult() {
   return someService.useResult();
  }
}

我可以通过模拟 SomeService 类来使用 mockito 测试 Parent 类。我不得不为此使用构造函数Parent.withService()。我一直在测试子类的方法。如何测试子类的方法？谢谢。

Answer 1

我会让服务成为一个可以传递给类的命名变量：

class Parent {    
  SomeService? _someService;
  SomeService get someService => _someService;
  
  Parent({SomeService? someService}) {
    this._someService = someService??SomeService();
  }

  Map<String, dynamic> getResult() {
    return _someService.getResult();
  }
}

class Child extends Parent {
  Child({SomeService? someService}):super(someService);
  
  int useResult() {
   return someService.useResult();
  }
}