使用Jest测试React Native应用程序
使用Jest测试React Native应用程序
提问于 2016-05-18 07:16:09
我一直在尝试让Jest与我的react原生项目一起工作，但没有太多运气。似乎大多数线程都是用来启动和运行的黑客解决方案，而我似乎无法克服我面临的最后一个障碍。
问题
当我试图运行下面这段代码时，我得到了下面的错误。如果我在jestSupport/env.js文件中模拟react-native，我就可以克服这个错误，但显然我不能使用任何结构(比如AsyncStorage )来实际测试我的代码(因为我只有模拟的功能)。
问题
有没有人对如何解决这个问题有什么建议？
在这个阶段，我愿意尝试任何东西，包括废弃所有与测试相关的东西，然后再试一次。如果是这样的话，我需要一些指南来遵循，因为关于Jest的React Native文档已经非常过时了，而且我对React场景还比较陌生。
错误
Runtime Error
Error: Cannot find module 'ReactNative' from 'react-native.js'
at Runtime._resolveNodeModule (/Users/Yulfy/Downloads/COMPANY-Mobile/node_modules/jest-cli/src/Runtime/Runtime.js:451:11)
at Object.<anonymous> (/Users/Yulfy/Downloads/COMPANY-Mobile/node_modules/react-native/Libraries/react-native/react-native.js:181:25)
at Object.<anonymous> (/Users/Yulfy/Downloads/COMPANY-Mobile/network/connections.js:8:18)测试代码
jest.unmock('../network/connections');
import Authorisation from '../network/connections';
describe('connections', () => {
it('Should store and retrieve a mocked user object', () => {
Auth = new Authorisation();
const TEST_STRING = "CONNECTION TEST PASS";
var userObj = {
test_string: TEST_STRING
};
Auth._localStore(userObj, (storeRes) => {
Auth._localRetrieve((retRes) => {
expect(retRes.test_string).toEqual(TEST_STRING);
});
});
});
});connection.js
/*
* All returns should give the following structure:
* {isSuccess: boolean, data: object}
*/
import React, { Component } from 'react';
import { AsyncStorage } from 'react-native';
const Firebase = require('firebase');
const FIREBASE_URL = 'https://COMPANY-test.firebaseio.com';
const STORAGE_KEY = 'USER_DATA';
class Authorisation{
_ref = null;
user = null;
constructor(){
}
getOne(){return 1;}
_setSystemUser(userObj, authObj, callback){
var ref = this.connect();
if(ref === null){
callback({isSuccess:false, data:{message:"Could not connect to the server"}});
}
ref = ref.child('users').child(authObj.uid);
ref.once("value", function(snapshot){
if(snapshot.exists()){
callback({isSuccess:false, data:{message:"Email is currently in use"}});
return;
}
ref.set(userObj, function(error){
if(error){
callback({isSuccess:false, data:error});
}else{
callback({isSuccess:true, data:authObj});
}
});
});
}
_localStore(userObj, callback){
AsyncStorage.setItem(STORAGE_KEY, userObj, (error) => {
console.log("_localStore::setItem -> ", error);
if(error){
callback({
isSuccess:false,
data:'Failed to store user object in storage.'
});
}else{
callback({
isSuccess:true,
data: userObj
});
}
});
}
_localRetrieve(callback){
AsyncStorage.getItem(STORAGE_KEY, (error, res) => {
console.log("_localStore::getItem:error -> ", error);
console.log("_localStore::getItem:result -> ", res);
if(error){
callback({
isSuccess:false,
data:error
});
}else{
callback({
isSuccess: true,
data: res
});
}
});
}
connect(){
if(this._ref === null){
_ref = new Firebase(FIREBASE_URL);
}
return _ref;
}
getUser(){
}
isLoggedIn(){
}
registerUser(userObj, callback){
var ref = this.connect();
if(ref === null){
callback({isSuccess:false, data:{message:"Could not connect to the server"}});
}
var that = this;
ref.createUser({
email: userObj.username,
password: userObj.password
}, function(error, userData){
if(error){
callback({isSuccess:false, data:error});
return;
}
var parseObj = {
email: userObj.username,
fullName: userObj.fullName
};
that.loginUser(parseObj, function(res){
if(res.isSuccess){
that._setSystemUser(parseObj, res.data, callback);
}else{
callback(res);//Fail
}
});
});
}
loginUser(userObj, callback){
var ref = this.connect();
if(ref === null){
callback({isSuccess:false, data:{message:"Could not connect to the server"}});
}
ref.authWithPassword({
email: userObj.email,
password: userObj.password
}, function(error, authData){
if(error){
callback({isSuccess:false, data:error.message});
}else{
callback({isSuccess:true, data:authData});
}
});
}
}
export default Authorisation;如果你已经读到这里，感谢你抽出时间来！
-Yulfy
回答 1
Stack Overflow用户
发布于 2016-06-01 01:15:27
你有没有试过在测试文件中模拟react-native？
它适用于我的测试用例：
jest.dontMock(`../my-module-that-uses React-native.AsyncStorage`);
jest.setMock(`react-native`, {
AsyncStorage: {
multiGet: jest.fn(),
},
});
const ReactNative = require(`react-native`);
const {AsyncStorage, } = ReactNative;
const myModule = require(`../my-module-that-uses React-native.AsyncStorage`);
// Do some tests and assert ReactNative.AsyncStorage.multiGet calls页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/37287702
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