Justen  Hintz

Justen Hintz


Top 10 React Testing Tools and Libraries in 2019

In this article, you’ll see useful frameworks, libraries and tools for testing your React components and application in 2019

Most people use Jest to test their components. Probably, with Enzyme and a couple of other utils. But, while FB recommends Jest as their React testing Framework of choice, the open source ecosystem for testing React applications is rich in frameworks and tools.

From various JavaScript testing frameworks to useful assertion libraries, choosing the right toolset is key in leveraging TDD in React, from component unit-testing to integration testing and even end-to-end testing React apps.

To help navigate the landscape, here are some popular Testing frameworks and libraries for React. Please feel free to comment and suggest your own favorite tools, or share your insights from working with any of them.

1. Jest

Jest is the testing framework used at Facebook to test React components and is adopted by Uber, Airbnb and other teams. The React community, therefore, recommends Jest as the React testing framework of choice. Jest itself works with many JavaScript projects our of the box, from create-react-app to NG, Vue and even TS or Babel.

Jest’s UI snapshot testing and complete-API philosophy combines well with React. Performance is also a plus with process-based parallel testing and optional priority to failed tests. With over 16M downloads a week, Jest is probably the most popular testing framework for React.

2. Mocha

Mocha is a JavaScript test framework for Node.js programs, featuring browser support, asynchronous testing, test coverage reports, and use of any assertion library. It is very configurable and gives the developer full control over how they wish to test their code, with which tools, while you can plug in and out most supporting libraries and tools in your chain.

Just like Jest and other frameworks, when used it React, Mocha can be combined with Enzyme, and also with Chai and other libraries for assertion, mocking etc. Some prefer it to test their React apps as well, often when in need of specific advanced configurations with a mature and rich toolset. Yet, this also can become a pain, as common tasks (like snapshots) will require adding more tools and further configurations in your workflow.


3. Chai

Chai is a BDD / TDD assertion and expectation library for node and the browser that can be delightfully paired with any javascript testing framework. It’s often associated with testing in Mocha with Enzyme, and can also be used with Jest and Enzyme. Chai’s basic interfaces include functionalities such as expect, should and assert, helping you to declare what to expect in a test. If choosing Mocha as your testing framework, it can be useful to give it a try.


4. Karma

Karma is not a testing framework or an assertion library (works with Jasmine, Mocha etc). It launches an HTTP server, and generates the test runner HTML file. With Karma, you can execute JavaScript code in multiple real browsers.

It was built to simplify the feedback loop between writing code and getting information from your tests, without having to dabble in configurations. You can run tests locally and check them in real browsers and devices, from your phone to tablets and desktops, while the entire feedback loop happens in your IDE. Karma also works with continuous integration to Jenkins, Travis etc.


5. Jasmine

Jasmine defines itself as a “JavaScript testing framework for browsers and node.js”.It’s a Behavior Driven Development testing framework for JavaScript. It does not rely on browsers, DOM, or any JavaScript framework. However, it’s been traditionally used in Frameworks like Angular with their CLI tool.

Jasmine can be used to test React applications, for example with Babel and Enzyme. There’s even a designated helper util library built to make this workflow smoother. Asking yourself whether or not there’s a reason to choose Jasmine over Jest?


6. Enzyme

It’s hard to dive into React testing, and particularly with testing frameworks like Jest, without crossing paths with Enzyme by AirbnbEng. Enzyme isn’t a testing framework, but rather a testing utility for React that makes it easier to test the outputs of components, abstracting the rendering of components.

Much like JQuery used to do on the DOM, Enzyme lets you manipulate, traverse, and in some ways simulate runtime given the output. In short, it can really help you render components, find elements and interact with them.


7. React-testing-library

For those of you who don’t use Enzyme, like Facebook itself, the React team recommends using the react-testing-library to simulate user behavior in your tests. Much like Enzyme, this library is a simple and complete set of React DOM testing utilities aimed to imitate actual user actions and workflows. Choosing between react-testing-library an Enzyme?


8. React test utils and test renderer

True, this isn’t a library but rather a collection of useful utilities (like act(), mockComponent(), isElement and more) in React that help to test components using a testing framework of your choice. Test renderer lets you render React components into pure JavaScript objects without depending on the DOM.

Knowledge of these useful tools is key in successfully testing your components and apps in React, and without having to force external tools into doing more than they should. Your decision-tree journey should probably start here.

Test Utilities

Test Renderer

9. Cypress IO

Cypress is a JavaScript end-to-end testing framework that makes it easy to setup, write, run and debug tests in the browser. It comes with its own dashboard that gives control over the status of our tests, and, because Cypress works in the actual browser, you can use the browser’s dev tools side-by-side.

You can time-travel with snapshots, automatically reload test changes and await assertions, and easily debug your code. With built-in parallelization and load balancing, Debugging tests in CI becomes much that easier too. However, you can’t use Cypress to drive two browsers at the same time, which might hurt. While not as popular as Puppeteer, Cypress can be useful for end-to-end testing your React applications. This library was even built to make it easier.


10. Pupeeter

Puppeteer is a Node library which provides an API to control Chrome over the DevTools Protocol. Puppeteer runs headless by default but can be configured to run full (non-headless) Chrome or Chromium.

This means, you can use Puppeteer to do pretty much anything you can manually do in the browser, such as generating screenshots, generating pre-rendered content from SPAs and even automating actions like form submissions, keyboard inputs etc.

Puppeteer is often used with Jest (and Faker) to test React applications end-to-end, while puppeteer provides screenshots and more for testing your app.



With the modularity of React comes better TDD. From components to integration and end-to-end testing, choosing the right tooling can help to put this theory into practice without pain, and enjoy its benefits.

Combining the right testing framework (e.g. Jest etc) with the right assertion/manipulation libraries (e.g. Enzyme etc) is the key to creating a smooth yet flexible workflow that can adapt while you upgrade, extend and modify your code. By isolating virtually isolating components from their projects you take modularity and TDD to a whole new level.

#reactjs #testing #web-development #javascript

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Top 10 React Testing Tools and Libraries in 2019
Autumn  Blick

Autumn Blick


How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

  • Performance: It delivers optimal performance.
  • Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
  • UI design: React Native enables you to design simple and responsive UI for your mobile app.
  • 3rd party plugins: This framework supports 3rd party plugins.
  • Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

  • Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
  • Near-native user experience: React Native provides several native components, and these are platform agnostic.
  • The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native

Aurelie  Block

Aurelie Block


Top 10 Automation Testing Tools: 2020 Edition

The demand for delivering quality software faster — or “Quality at Speed” — requires organizations to search for solutions in Agile, continuous integration (CI), and DevOps methodologies. Test automation is an essential part of these aspects. The latest World Quality Report 2018–2019 suggests that test automation is the biggest bottleneck to deliver “Quality at Speed,” as it is an enabler of successful Agile and DevOps adoption.

Test automation cannot be realized without good tools; as they determine how automation is performed and whether the benefits of automation can be delivered. Test automation tools is a crucial component in the DevOps toolchain. The current test automation trends have increased in applying artificial intelligence and machine learning (AI/ML) to offer advanced capabilities for test optimization, intelligent test generation, execution, and reporting. It will be worthwhile to understand which tools are best poised to take advantage of these trends.****

#automation-testing #automation-testing-tools #testing #testing-tools #selenium #open-source #test-automation #automated-testing

Top 10 React Native App Development Companies in USA

React Native is the most popular dynamic framework that provides the opportunity for Android & iOS users to download and use your product. Finding a good React Native development company is incredibly challenging. Use our list as your go-to resource for React Native app development Companies in USA.

List of Top-Rated React Native Mobile App Development Companies in USA:

  1. AppClues Infotech
  2. WebClues Infotech
  3. AppClues Studio
  4. WebClues Global
  5. Data EximIT
  6. Apptunix
  7. BHW Group
  8. Willow Tree:
  9. MindGrub
  10. Prismetric

A Brief about the company details mentioned below:

1. AppClues Infotech
As a React Native Mobile App Development Company in USA, AppClues Infotech offers user-centered mobile app development for iOS & Android. Since their founding in 2014, their React Native developers create beautiful mobile apps.

They have a robust react native app development team that has high knowledge and excellent strength of developing any type of mobile app. They have successfully delivered 450+ mobile apps as per client requirements and functionalities.
Website: https://www.appcluesinfotech.com/

2. WebClues Infotech
WebClues Infotech is the Top-Notch React Native mobile app development company in USA & offering exceptional service worldwide. Since their founding in 2014, they have completed 950+ web & mobile apps projects on time.

They have the best team of developers who has an excellent knowledge of developing the most secure, robust & Powerful React Native Mobile Apps. From start-ups to enterprise organizations, WebClues Infotech provides top-notch React Native App solutions that meet the needs of their clients.
Website: https://www.webcluesinfotech.com/

3. AppClues Studio
AppClues Studio is one of the top React Native mobile app development company in USA and offers the best service worldwide at an affordable price. They have a robust & comprehensive team of React Native App developers who has high strength & extensive knowledge of developing any type of mobile apps.
Website: https://www.appcluesstudio.com/

4. WebClues Global
WebClues Global is one of the best React Native Mobile App Development Company in USA. They provide low-cost & fast React Native Development Services and their React Native App Developers have a high capability of serving projects on more than one platform.

Since their founding in 2014, they have successfully delivered 721+ mobile app projects accurately. They offer versatile React Native App development technology solutions to their clients at an affordable price.
Website: https://www.webcluesglobal.com/

5. Data EximIT
Hire expert React Native app developer from top React Native app development company in USA. Data EximIT is providing high-quality and innovative React Native application development services and support for your next projects. The company has been in the market for more than 8 years and has already gained the trust of 553+ clients and completed 1250+ projects around the globe.

They have a large pool of React Native App developers who can create scalable, full-fledged, and appealing mobile apps to meet the highest industry standards.
Website: https://www.dataeximit.com/

6. Apptunix
Apptunix is the best React Native App Development Company in the USA. It was established in 2013 and vast experience in developing React Native apps. After developing various successful React Native Mobile Apps, the company believes that this technology helps them incorporate advanced features in mobile apps without influencing the user experience.
Website: https://www.apptunix.com/

7. BHW Group
BHW Group is a Top-Notch React Native Mobile App Development Company in the USA. The company has 13+ years of experience in providing qualitative app development services to clients worldwide. They have a compressive pool of React Native App developers who can create scalable, full-fledged, and creative mobile apps to meet the highest industry standards.
Website: https://thebhwgroup.com/

8. Willow Tree:
Willow Tree is the Top-Notch React Native Mobile App Development Company in the USA & offering exceptional React Native service. They have the best team of developers who has an excellent knowledge of developing the most secure, robust & Powerful React Native Mobile Apps. From start-ups to enterprise organizations, Willow Tree has top-notch React Native App solutions that meet the needs of their clients.
Website: https://willowtreeapps.com/

9. MindGrub
MindGrub is a leading React Native Mobile App Development Company in the USA. Along with React Native, the company also works on other emerging technologies like robotics, augmented & virtual reality. The Company has excellent strength and the best developers team for any type of React Native mobile apps. They offer versatile React Native App development technology solutions to their clients.
Website: https://www.mindgrub.com/

10. Prismetric
Prismetric is the premium React Native Mobile App Development Company in the USA. They provide fast React Native Development Services and their React Native App Developers have a high capability of serving projects on various platforms. They focus on developing customized solutions for specific business requirements. Being a popular name in the React Native development market, Prismetric has accumulated a specialty in offering these services.
Website: https://www.prismetric.com/

#top rated react native app development companies in usa #top 10 react native app development companies in usa #top react native app development companies in usa #react native app development technologies #react native app development #hire top react native app developers in usa

Top 10 Mobile Performance Testing Tools

Challenge for brands: how to offer a seamless, fast, and user-friendly mobile experience?

App users have a low tolerance for slowness, with a reported 43% of users unhappy if they have to wait longer than three seconds for an app to load. ([App Samurai])

It’s not enough to ensure that your mobile app functions properly, but also to test how it behaves on different devices, under heavy user load, different network connections, etcetera. It’s equally important to test different metrics on both the client-side as well as the server-side. This is where finding the right tool or set of tools for mobile performance testing is essential.

After extensively researching, I’ve put together a list of top-rated mobile performance testing tools and provided an overview of each below.

#testing #load testing tool #testing tools #performance #mobile testing tools

Chumarat Pat

Chumarat Pat


Interaction Testing with React Testing Library

Testing is complicated. I’ve certainly never been good at it. For the longest time, I’ve only been focused on basic function input-output unit tests. Why? Because they were easy — you didn’t need to render HTML, you didn’t need to query DOM elements, you didn’t need to interact with said DOM elements. But of course, React component testing is a necessity for any mature codebase. And it finally came time for me to sit down and figure it out.

That’s when I discovered React Testing Library. And suddenly, everything seemingly became much simpler. All the complexities that I’ve encountered, but not understood, that made me put off React component testing disappeared. Hopefully, the same will happen for you.

#react-testing-library #unit-testing #react #jest #interaction-testing