Question

我正在使用jest进行反应原生的单元测试。这是我的componentWillMount（）函数：

componentWillMount() {
    this.setState({ loading: true });
    axios.get(SERVER_URL + '/courses')
        .then(response => {

            this.state.trainingcatalogues = []
            this.state.traininglist = []
            this.state.Location1 = []
            this.state.Category1 = []
            this.state.Location2 = ['All']
            this.state.Category2 = ['All']                
            for (var key in response.data) {
                if (response.data[key].coursetype === 'Instructor-Led' && response.data[key].status === 'Active' ) {
                    this.state.Location1.push(response.data[key].location);
                    this.state.Category1.push(response.data[key].category);
                    this.state.trainingcatalogues.push(response.data[key]);
                    this.state.traininglist.push(response.data[key]);
                }
            }

我想嘲笑回复＆＃39;在我的测试用例中。它具有以下格式：

let response = 
   {
     "data": [
       {
         "_id": "5acb16701e09ae8abc29e7fb",
         "courseName": "Agile Fundamentals420",
         "category": "Agile",
         "coursetype": "Instructor-Led",
         "duration": 22,
         "addnote": "contractor",
         "status": "Completed",
         "registrations": 10
       }
     ]
   }

这是我的单元测试用例：

it('should test the componentwillMount function', () => {
 const wrapper = shallow(<Instructor_cata navigation = {navigation}/>);
    const instance = wrapper.instance();
    const componentWillMountSpy = jest.spyOn(instance,"componentWillMount");
    instance.forceUpdate();
    instance.componentWillMount();
    expect(componentWillMountSpy).toHaveBeenCalled();

}）;

如何在单元测试用例中模拟此响应数据？

Answer 1

您需要模拟Axios库，并且有几个选项可以执行此操作。首先有一些像axios-mock-adapter或jest-mock-axios这样的库，但是你自己也可以自己编写一个模拟器，它没什么用。

基本示例：

// mock.js: custom axios mock file in your tests folder

module.exports = {
  get: jest.fn((url) => {

    switch (url): {
      case '<your_url>/courses':
        return Promise.resolve(<your_response_object>)

      default: 
        return Promise.resolve({...})
    })
  }
};

只需在测试文件中导入模拟。并且您可以对post（）等其他axios方法使用类似的方法。

如何在jest中使用对象内的数组模拟数据

1 个答案: