How to do end-to-end testing on React Native with Detox

  • They are being performed on matched elements.Expect verifies if a certain value is as expected to be.As we can see detox covers a lot of possible user interactions that can be automated.Make our tests more readableTo be honest, we can do much better.First let’s get rid of the duplication for matchers…
  • Automate the process and land on the moon 🚀Once we reached a certain amount of tests, we thought it could be nice to automate the process and think in terms of “continuous testing”.
  • That’s why we decided to run the end-to-end test on our build server.Every new pull request that comes in, triggers unit tests with Jest on CircleCI and now also our end-to-end tests on Bitrise (our build server).
  • This is mostly due to the Detox build scripts.AlternativesWe also considered others libraries such as:Appium which is a cross platform test library where tests can be written in many languages (node, ruby, java, … ).
  • Hence, our choice of using Detox.ConclusionIn this article we saw how to handle Detox and its API, how to automate everything with Bitrise (or any CI that can runs an IOS Simulator).

When we started writing our React-Native app at Home, testing was something we took seriously from day one. While it was easy to setup a proper unit-tests workflow with Jest and Typescript, we figure…
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React Behavioral Wrapper Components – Ian Carlson – Medium

React Behavioral Wrapper Components  #ui #react #javascript #reactjs

  • But because of how flexible React is you can create wrapper components that add behavior to the children being passed through.
  • This is more applicable when using Redux since not all the backend requests are made within the same component, like a session container for example.Here’s a example of creating an opacity animation component that adds the animation to any child component.
  • This is based on the example in the React documentation using the CSS transition group extension to apply fade-in, fade-out animations based on the lifecycle of the child component(s).
  • The former is actual animation time and the latter is how long temporary classes will stay in existence.Here’s an example of how to use the OpacityAnimation:You can also pass an array of children as well, but it’s important to carefully manage the key properties on each child — even for just one child.
  • For example, a tooltip component would display the children as is, but then attach event handlers to display the tooltip on the right conditions.

Another great thing about React is how easy it is to add behavior to components through composition. Typically new people only think of composition in terms of layout. But because of how flexible…
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Reactjs Development Services India

#ReactJS has proven to be one of best #Javascript front-end library


  • ReactJS has proven to be one of the best frameworks out there and that is visible by the adaptability of the same by world famous companies.
  • It gives a near perfect experience for the client as well as the developer and ensures that interfaces built on it are not only great in performance but are also visually appealing.
  • Techuz has provided reactjs web development services to various clients all of which have been amazed by the technology.

Hire dedicated reactjs developer from top reactjs web & mobile application development company India Techuz. we have expert reactjs team for innovative solutions.
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React-based UI frameworks – Prototyping: From UX to Front End

React-based UI frameworks  #webdesign #uidesign #webdevelopment #react #javascript #reactjs

  • Most of these are meant more as a window into process (and as a recruiting tool) than as an open standard that other developers can use, but the principles are the same: a reusable library of components with standardized markup.Having a strong design system and a frontend architecture that’s designed to support it is incredibly powerful.Today, even more of the frontend stack has evolved toward a modular, component-based architecture.
  • Here’s the markup for the Feedback component in MailChimp’s library:div class=”feedback-block warning section” role=”status” div class=”lastUnit size1of1″ div class=”c-media” div class=”c-mediaImage v-isFreddicon” span class=”freddicon warn-circle”/span /div div class=”c-mediaBody–centered” h4Account status /h4 p You closed your account on Nov 29, 2013 07:00 pm /p /div /div /div/divDepending on the component, you may also need to include a JS file to handle any interactivity or other logic the component needs.In React, the markup and logic for this component would be defined in only one place, so rendering it would look something like this:Feedback type=”warning” title=”Account status” You closed your account on Nov 29, 2013 07:00 pm/FeedbackReact’s templating system is JSX — this concise version will get translated into the same markup as the top example in the browser.
  • The great thing about this system is that if the keepers of the MailChimp design system wanted to change this component, they’d just change it in one place — the JSX for rendering it would stay the same.
  • In the old world, updating the uses of this component would be a messy and error-prone find-and-replace operation.Having a strong design system and a frontend architecture built around it is incredibly powerful.
  • More importantly, users benefit from a predictable system that works the same everywhere across an app — every time I see a Feedback block in MailChimp it looks and works exactly the same, so my brain spends less effort understanding what’s happening and more on whatever I’m actually trying to accomplish.The list of React-based UI frameworks is steadily growing.

There’s a new crop of web UI frameworks in town, in the grand tradition of Bootstrap, a framework developed at Twitter. Five years ago, Bootstrap was not only an easy way to put together a UI that…
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Virtual DOM – Sadick – Medium

Virtual DOM:  What you know might be enough insufficient @Izohbiz  #JavaScript #Reactjs #Tech

  • For you to have a better understanding of why you might want to use a virtual DOM, you must look at the problems that led us to the virtual DOM.
  • The virtual DOM is more efficient than direct DOM manipulation because it patches the DOM with the necessary changes avoiding unnecessary repaints and re-renders.
  • Whenever you have any changes i.e. you want to add another div to your DOM then the virtual DOM will be created which actually does not do any changes in the actual DOM. Now with this virtual DOM, you will be checking the difference between this and your current DOM.
  • Creation of the DOM tree – Once the browser receives a HTML file, the render engine parses it and creates a DOM tree of nodes, which have a one-one relation with the HTML elements.
  • People often throw around the statement “The DOM is slow”.

I have been playing with vuejs for a while now and I must say, the experience has been amazing so far. I recently heard Thorsten Ball, the author of the interpreter book being interviewed on the…
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Some things that are better in Vue than in React – srhise – Medium

Some things that are better in #VueJS than in #ReactJS:  #JavaScript #frontend

  • Overall, after having significant time using both, I find both frameworks to be very similar in a lot of ways, and while I do prefer Vue overall, that’s not what this post is about.
  • When you mutate state in Redux, each reducer returns the entire state object back.
  • I don’t have to return the entire state object when I mutate the state.
  • The time travel features still work, somehow vuex is smart enough to keep clean copies of each state.
  • The following example shows the ‘methods’ and ‘watch’ objects of a vue component animating value transitions in the state.

On our team, we have a healthy balance of front end projects. We don’t usually choose a framework based on developer preference, but based on the requirements of the projects. So, for us, we don’t…
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React Universal with Next.js: Server-side React

#ReactJS Universal with #NextJS: Server-side React

  • /pages/index.js // Import React import React from ‘react’ // Export an anonymous arrow function // which returns the template export default () => (

    This is just so easy!

  • import React from ‘react’ import Head from ‘next/head’ import axios from ‘axios’; export default class extends React.
  • Our index page does not implement this performance related feature in details page.
  • /pages/details.js import React from ‘react’ // Import Link from next import Link from ‘next/link’ export default () => (

    Coming soon. . .!

The term “universal” is a community-coined term for building web apps that render happily on a server. You might be familiar with “isomorphic” as…
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