jest | 易学教程

Create React App cannot find tests

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问题 I recently started a new project using create-react-app. I moved the App.test.js from outside the /src folder into a root level /tests folder so my folder structure looks like this now: > node_modules > public > src ... App.js > tests App.test.js ... And here's the entire App.test.js file: import React from 'react'; import ReactDOM from 'react-dom'; import App from "../src/App"; it('renders without crashing', () => { const div = document.createElement('div'); ReactDOM.render(<App />, div);

ElasticSearch Error: Invalid term-aggregator order path [_key]. Unknown aggregation [_key] while performing aggregation from Java

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问题 i'm getting the below error when performing aggregation Error: Invalid term-aggregator order path [_key]. Unknown aggregation [_key] while performing aggregation from Java code : public static void main(String[] args){ JestClient jestClient = getJestClient(); SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder(); searchSourceBuilder.size(100); searchSourceBuilder.aggregation(AggregationBuilders.terms("products").field("myField.keyword"). valueType(ValueType.STRING).size(100));

Serverless 实战 —— Funcraft + OSS + ROS 进行 CI/CD

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 前言首先介绍下在本文出现的几个比较重要的概念：函数计算（Function Compute）：函数计算是一个事件驱动的服务，通过函数计算，用户无需管理服务器等运行情况，只需编写代码并上传。函数计算准备计算资源，并以弹性伸缩的方式运行用户代码，而用户只需根据实际代码运行所消耗的资源进行付费。函数计算更多信息参考。 Funcraft ：Funcraft 是一个用于支持 Serverless 应用部署的工具，能帮助您便捷地管理函数计算、API 网关、日志服务等资源。它通过一个资源配置文件（template.yml），协助您进行开发、构建、部署操作。Fun 的更多文档参考。 OSS : 对象存储。海量、安全、低成本、高可靠的云存储服务，提供99.9999999999%的数据可靠性。使用RESTful API 可以在互联网任何位置存储和访问，容量和处理能力弹性扩展，多种存储类型供选择全面优化存储成本。 ROS ：资源编排（ROS）是一种简单易用的云计算资源管理和自动化运维服务。用户通过模板描述多个云计算资源的依赖关系、配置等，并自动完成所有资源的创建和配置，以达到自动化部署、运维等目的。编排模板同时也是一种标准化的资源和应用交付方式，并且可以随时编辑修改，使基础设施即代码（Infrastructure

Testing Redux Thunk Action Creator

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问题 I've got a redux action creator that utilizes redux-thunk to do some logic to determine what to dispatch to the store. Its not promise-based, like an HTTP request would be, so I am having some issues with how to test it properly. Ill need a test for when the value meets the condition and for when it doesn't. Since the action creator does not return a promise, I cannot run a .then() in my test. What is the best way to test something like this? Likewise, I believe it would be pretty

Jest: Test suite failed to run, Unexpected token =

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问题 I am trying to test a React component with Jest/Enzyme. I expect the test to at least run, but it already fails when it is importing files and does not get to the test itself. So I am wondering what in the configuration I am missing? Error: __tests__/Favorite.test.js ● Test suite failed to run /src/components/favorite/Favorite.js: Unexpected token (13:13) 11 | } 12 | > 13 | isFavorite = (props) => { | ^ 14 | return localStorage.getItem(props.recipe.id) ? true : false 15 | } 16 | Test File:

How do I test call and apply functions in jest?

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问题 Here's my callnapply.js file const callAndApply = { caller(object, method, nameArg, ageArg, tShirtSizeArg) { method.call(object, nameArg, ageArg, tShirtSizeArg); }, applier(object, method, argumentsArr) { method.apply(object, argumentsArr); }, }; module.exports = callAndApply; And here's a snippet from the test file which contains the non-working test: const callnapply = require('./callnapply'); test('testing Function.prototype.call as mock function', () => { const outer = jest.fn(); const

Debugging Tests With Create React App using Typescript in VSCode or Chrome

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问题 Created an app using (https://github.com/Microsoft/TypeScript-React-Starter) npm install -g create-react-app create-react-app my-app --scripts-version=react-scripts-ts I've gone through a number of articles, seem to be going around in circles, but have not yet found how i can debug the default app.test.tsx Node is on version 7.9.0 Everything else should be on the latest version. 回答1: This has been fixed now. https://github.com/Microsoft/TypeScript-React-Starter/issues/46 Install Node v8.5

How do I test `image.onload` using jest in the context of redux actions (or other callbacks assigned in the action)

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问题 My problem was that I am trying to make a unit test for a function but can't figure out how to test a part of it. This is a react / redux action that does the following: 1) retrieves json data with an image url 2) loads the image into an Image instance and dispatches its size to the reducer (asynchronously when image is loaded using Image.onload) 3) dispatches that the fetch was completed to the reducer The image onload happens asynchronously, so when I try to unit test it it wouldn't be

一篇文章带你了解JavaScript中的基础算法之“字符串类”

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 作者 | Jeskson 来源 | 达达前端小酒馆 1 算法可以干什么呢？提高什么？有什么好处呢？前端的同学需要提升编程核心内功，建立和健全算法知识体系，基础算法、数据结构、进阶算法，由浅入深讲解，透彻理解抽象算法，算法面试是关键一环，冲击大厂前端offer。学习算法前掌握ES6哦！需要掌握单元测试的语言，Jest Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It works with projects using: Babel, TypeScript, Node, React, Angular, Vue and more! Jest是一个令人愉悦的JavaScript测试框架，专注于简单性。它适用于使用以下项目的项目：Babel，TypeScript，Node，React，Angular，Vue等！ zero config Jest aims to work out of the box, config free, on most JavaScript projects. 零配置 Jest旨在在大多数JavaScript项目中开箱即用，无需配置。 snapshots Make tests

Signing AWS HTTP requests with Apache HttpComponents Client

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问题 I'm trying to make HTTP requests to an AWS Elasticsearch domain protected by an IAM access policy. I need to sign these requests for them to be authorized by AWS. I'm using Jest, which in turn use Apache HttpComponents Client. This seems to be a common use case and I was wondering if there is out there some kind of library which I can use on top of Apache HttpComponents Client to sign all the requests. 回答1: I think I found it! :) This project seems to do exactly what I want : aws-signing