小编And*_*eea的帖子

我尝试测试反应本机组件，但出现此错误。

我意识到错误来自文件import Convertor, { ConvertorComponent } from '../components/Convertor.js中的声明convertor.test.js。export ConvertorComponent我用和导出了组件export default Convertor。

const warnedKeys: {[string]: boolean} = {};

SyntaxError: Missing initializer in const declaration

at ScriptTransformer.transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:471:17)
at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:513:25)
at Object.<anonymous> (node_modules/react-native/Libraries/react-native/react-native-implementation.js:14:18)

如何在玩笑错误情况下进行测试？这就是我所做的：我不知道是否存在如何测试它的方法。

it ('the fetch fails and throw an error', async () => {
      let response = {
        status: 400,
        body: 
        {
          base : "RON",
          date: "2019-08-01",
          rates: {"error": 'error'}
        }
      };
      fetch.mockReject(response)
      try {
        await fetchData();
      } catch (e) {
        expect(e).toEqual(response);
        expect(await fetchData()).rejects.toThrow(e);
      }
    });

这是代码：

 fetchData = async () => {
    try {
      const response = await fetch('https://api.exo/latest?base=RON');
      const data = await response.json();
      return data;
    } catch (e) {
      throw e;
    }
  };