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Testing

As teams adopt AI-assisted development, traditional testing struggles to keep pace with generated code and faster delivery workflows. Learn how autonomous AI agents and advanced automation can validate changes, catch regressions, and help teams ship faster without sacrificing reliability.

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Article
4/14/2026

Agent React DevTools: Give AI Agents Access to React Internals

Agent React DevTools gives AI agents access to the React component tree, state, and performance data, enabling deeper debugging and more reliable QA for React and React Native apps.
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Article
4/3/2026

How We Optimized Agent Device for Mobile App Automation

Discover how we optimized Agent Device to reduce LLM token consumption by over 50% and speed up AI-driven mobile app automation.
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Article
2/17/2026

Agent Device: iOS & Android Automation for AI Agents

Agent Device is a lightweight CLI for AI-driven mobile automation on iOS and Android, with structured snapshots and deterministic replay.
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Article
10/15/2025

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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Article
10/3/2025

From Unit to E2E: A Guide to Testing React Native TV in 2026

Standard mobile testing tools fail for React Native TV apps due to D-pad navigation. This guide shows how to build custom helpers for React Native Testing Library that emit hardware key events and how to configure Appium for end-to-end testing on tvOS and Android TV.
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Article
6/12/2024

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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Article
9/12/2023

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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Article
2/2/2023

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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Article
9/27/2022

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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Article
5/12/2022

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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Article
2/7/2022

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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Article
10/29/2020

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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Article
10/22/2020

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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Article
8/5/2020

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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Article
7/8/2020

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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Article
5/28/2020

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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Article
1/10/2020

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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Article
11/6/2017

Testing a React App With Cypress

First steps to using Cypress - setup and testing auth actions.
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Article
10/5/2017

Time to Detox

Check out our guide on how to write e2e test for React Native apps with Detox.
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Article
2/5/2017

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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Article
9/29/2016

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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Article
9/9/2016

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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Article
5/3/2016

Testing Your React Native Apps

A step-by-step guide to testing your React Native apps for iOS ecosystem.
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podcast
5/13/2026

How AI Is Changing React Native Development and Testing

Zack Ebenfeld joins React Universe On Air to talk about how AI is changing React Native workflows, testing, QA, and day-to-day engineering work.
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podcast
8/11/2020

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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podcast
8/23/2023

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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Event
7/6/2026

Mobile QA with Cloud Agents at AI Coding Summit London

Michał Pierzchała will speak at AI Coding Summit London 2026 about mobile QA agents for iOS and Android pull request workflows.
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Event
6/17/2026

Automating Mobile QA with Cloud Agents

Michał Pierzchała will present Automating Mobile QA with Cloud Agents at Ship London on 17 June 2026.
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Event
3/19/2026

Agent Device, AI workflows, and mobile testing in practice

A discussion on Agent Device, AI-driven workflows, and testing mobile apps using simulators and accessibility data.
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Event
12/9/2025

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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Event
11/14/2025

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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Event
10/16/2025

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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Event
10/4/2025

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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Event
4/1/2025

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.
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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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Need QA that keeps up with AI-native delivery?

We help teams automate validation, prevent regressions, and keep applications reliable as delivery speeds up.

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Head of Platform
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The trainers are always very helpful and supportive. It really makes a difference!

Artem Musiienko
Staff Eng
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HelloFresh

Not only does Callstack have tremendously talented engineers, but I know they care about the success of the project as much as I do.

TC Davis
Product
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Expo

I recommend them as a trusted tech partner for running complex projects.

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