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Insights

Testing

Testing is essential for maintaining reliability and preventing regressions in React Native applications. Discover how to implement effective testing strategies, from unit tests and component testing to end-to-end testing, ensuring your applications remain stable across platforms and updates.

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Introducing React Native Harness: Fast, Real-Device Testing for Native Modules

React Native Harness lets you run Jest-style tests directly on devices and emulators. Fast, reliable, and CI-ready. It’s the easiest way to validate native behavior in React Native.

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Testing Expo Web3 Apps With Wagmi and Anvil

How to test web3 apps with React Native. Configure your project using Anvil, Wagmi, Viem, and Web3Modal, and gain insights on writing reliable tests.

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Introducing E2E Tests to React Native Core

Learn how End-to-End (E2E) tests were introduced to React Native core through collaboration between Callstack, Microsoft, and Meta engineers.

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Performance Regression Testing for React Native

As your React Native app grows, its performance tends to degrade. Prevent that from happening with performance regression testing and Reassure.

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A Comprehensive Guide to Mock Service Worker (MSW)

Discover our comprehensive guide to Mock Service Worker (MSW) and use the API mocking tool for testing, development, debugging to deliver bug-free code.

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Run Tests for Key Pieces of Your App

It’s crucial to check if everything is up and running in your new app. Focus on key pieces and run tests. Find out more about testing apps.

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How to Not Break Your App After Migrating From Tipsi Stripe to Stripe React Native - Migration Guide, Part 4

Learn how to not break your app after migrating from Tipsi Stripe to Stripe React Native in the fourth part of teh Tipsi Migration Guide preprared by Callstack,

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Testing React Native Apps in the Cloud - Part 2

Learn how to test your app in the cloud by reading the second part of our quick guide. You'll find out how to create such test and conduct it properly.

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Testing React Native Apps In the Cloud - Part 1

A quick guide on how to test React Native apps in the cloud instead of using testing devices. In this part, you'll find out how to prepare for this process.

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React Native Testing Library With Redux

In this article, we discuss how Redux can be helpful in proceeding tests with React Native Testing Library and how can you benefit from this solution.

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From Enzyme to React Native Testing Library: How I Changed My Way of Unit Testing

Learn how to move from Enzyme to React Native Testing Library and made unit test more effective and closer to what the users can interact with.

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React Native Testing Library 2.0 - What’s New?

React Native Testing Library 2.0 is out now! Read the article and find out what's new. Check our migration guide.

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React Native Testing Library Turns Into Testing Library

Find out all about React Native Testing Library becoming Testing Library. Dive into insights and updates as we navigate this transformative journey.

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Testing a React App With Cypress

First steps to using Cypress - setup and testing auth actions.

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Time to Detox

Check out our guide on how to write e2e test for React Native apps with Detox.

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Type-Checking React and Redux (+Thunk) with Flow - Part 1

In this article, we’ll cover how to type-check Redux. This is the first part of a two-part series and only covers React.

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Testing React Native With the New Jest - Part II

A step by step guide to testing React Native with the Jest. Part Two - Redux: Snapshots for your actions and reducers.

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Testing React Native With the New Jest - Part I

A step by step guide to testing React Native with the Jest. Part One - Snapshots come into play.

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Testing Your React Native Apps

A step-by-step guide to testing your React Native apps for iOS ecosystem.

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Look into the Future of React Native Testing Library

The first episode of React Universe On Air (formerly known as The React Native Show) provides insights into React Native Testing Library. Mike and his guest give a quick glimpse into the very concept of Testing Library and tell the story behind React Native Testing Library.

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Introducing E2E Tests to React Native Core

This episode of the React Native Show dives into the recent introduction of End-to-End (E2E) testing in RNTester. Join us as we unpack the thought process, technical considerations, and practical implementation of this new approach to testing in React Native.

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Write Once, Test Everywhere: Cross-Platform Testing for React Native

Join Szymon Chmal at WarsawJS #133 to explore cross-platform testing in React Native with a new approach powered by React Native Harness.

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Testing Native Modules Reliably With JavaScript

Learn how React Native Harness bridges the gap between mocking and E2E testing: real device tests, full native access, Jest-style simplicity.

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React Native Harness, Next.js 16 Beta & Remix v3

This week’s Live Dev Session dives into React Native Harness with Szymon Chmal, explores the Next.js 16 Beta and Remix v3 “pre-drop,” and breaks down the biggest React and React Native updates from the community and React Alicante 2025.

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Write Once, Test Everywhere: Cross-Platform Testing for React Native

Cross-platform testing in React Native made simple: a lightweight architecture to run and extend tests on any JavaScript-powered platform.

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How to Run E2E Tests on Every PR and Don’t Burn All Your CI Credits

End-to-end tests are notoriously slow and costly, especially in mobile development. This talk introduces new tools and techniques to make E2E testing fast and efficient, so you can run tests on every pull request without draining CI resources.

We don't follow best practices, we set them

React Native Core Contributors

Trusted by Meta, Microsoft, and the community

We don't follow best practices, we set them

React Native Core Contributors

Trusted by Meta, Microsoft, and the community

We don't follow best practices, we set them

React Native Core Contributors

Trusted by Meta, Microsoft, and the community

We don't follow best practices, we set them

React Native Core Contributors

Trusted by Meta, Microsoft, and the community

We don't follow best practices, we set them

React Native Core Contributors

Trusted by Meta, Microsoft, and the community

We don't follow best practices, we set them

React Native Core Contributors

Trusted by Meta, Microsoft, and the community

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We assist with setting up robust testing strategies for React Native apps.

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Having Callstack is a wonderful experience and gives us the ability to move so much faster than we could without them.

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Expo

They took our team from 'zero to hero' in React Native

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OneHousing

Despite the geographical distance, our collaboration has been successful with strong deliveries on time.

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