Question

我正在编写一个React-Native应用程序，我需要测试一个屏幕：

import requests # to make requests. import pdfkit # for saving as pdf url="http://exam.cusat.ac.in/erp5/cusat/CUSAT-RESULT/Result_Declaration/display_sup_result" #form url pdfs=[] payload={ "deg_name":"B.Tech", "semester":"5", "month":"November", "year":"2016", "result_type":"Regular" } option={'quiet': ''} for i in range(12153600,12153660+1): payload.update({"regno":str(i)}) response=requests.post(url,data=payload) pdfkit.from_string(response.content,str(i)+".pdf",options=option) #saves to 12153600.pdf - 12153660.pdf files open("result_"+str(i)+".html","w").write(response.content) #This will save results from roll no 12153600 - 12153660 in result_rollno.html files.

pdfkit

MyScreen.js

import React, { Component } from "react";
import CustomTable from "./CustomTable";

export default MyScreen extends Component {
  render() {
    return <CustomTable />;
  }
}

CustomTable.ios.js调用一些特定于iOS的代码，所以我通过简单地在import React, { Component } from "react"; import { View } from "react-native"; import TableView from "react-native-tableview"; export default MyScreen extends Component { render() { return ( <View> ...some stuff <TableView /> </View> ); } }文件夹中返回android版本（react-native-tableview）来嘲笑它

CustomTable.android.js

__mocks__

我想要做的是使用Jest测试__mocks__/CustomTable.ios.js，但我希望它使用import CustomAndroidTable from "../CustomTable.android"; export const CustomTable = CustomAndroidTable;。我该怎么做才能做到这一点？这对Jest来说甚至可能吗？我当前的测试文件如下：

MyScreen.js

__mock__/CustomTable.ios

但它仍然会调用tests/MyScreen.test.js的原始版本。我做错了什么？

Answer 1

您应该在套件测试之外调用jest.mock。它应该在你的进口后立即。

import React from "react";
import renderer from "react-test-renderer";
import MyScreen from "../src/MyScreen";

jest.mock("../src/CustomTable.ios");

describe("test", () => {
  it("works", () => {
  const tree = renderer.create(
    <MyScreen />,
  ).toJSON();
  expect(tree).toMatchSnapshot();
});

使用自定义模拟对于具有开玩笑的组件

1 个答案: