2025 10 04 30 ŁUKASZ CHLUDZIŃSKI CONGRESO REACT ALICANTE The international React js conference in
summary
Claims a new tool called harness fills the gap between fast Jest-style tests and slow E2E and gives real native access without building UIs. Demos use Maestro and mocked Jest tests against the MKV storage library, converting 12 existing test cases so eight pass and four fail (showing mocks lied). End-to-end run via Maestro takes ~30 seconds per test; harness runs the batch in milliseconds by bundling tests with Metro and hijacking the app on device.
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chapters (6)
- 0:00React Native testing tradeoffs
- 3:19Testing native modules problems
- 14:34Introducing Harness for testing
- 16:21How Harness works and benefits
- 26:40Harness demo and future
- 29:57Closing remarks
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