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Szymon Chmal
@chmal.it

🎉 Introducing React Native Harness - a lightweight framework for testing native modules directly on device or emulator. Write tests in a Jest-like syntax, run them in a real React Native runtime, and verify native behavior without mocks.

Szymon Chmal
@chmal.it

Harness runs tests in a real React Native runtime. Unlike Jest, it doesn't rely on mocks and unlike Detox or Maestro, it focuses on testing native code directly, not automating UI flows.

Szymon Chmal
@chmal.it

Harness runs wherever Metro runs, starting with iOS and Android. It's built to be portable, making support for new platforms straightforward. As proof, we're also bringing support for VegaOS.

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Szymon Chmal
@chmal.it

Designed for library authors and teams building native integrations. It is cross-platform, works on CI/CD and made to test real native behavior with a familiar workflow.

Szymon Chmal
@chmal.it

Harness is Open Source! Check out our Github and make sure to star it! github.com/callstackinc...

github.comGitHub - callstackincubator/react-native-harness: Harness brings Jest-style tests to real native environments so you can test TurboModules like you would test your React Native app: with JavaScript.Harness brings Jest-style tests to real native environments so you can test TurboModules like you would test your React Native app: with JavaScript. - callstackincubator/react-native-harness