React Native & Jest: Automatic Native Module Mocking
Jest tests for React Native run in Node, not on a device, so native code won't work. The `react-native` preset automatically mocks native modules, letting you test components without a real device environment.
Jest tests for React Native run in a Node.js environment, not on a device, so they can't execute native iOS or Android code. The `react-native` Jest preset solves this by automatically mocking core native modules and components like `View` and `Text`. This is the default setup for React Native projects, enabling fast unit and snapshot tests without needing to boot an emulator. The biggest mistake is assuming the mock behaves exactly like the real native module; mocks are simple stand-ins.
Read the original → jestjs.io
- #react-native
- #jest
- #testing
- #mocking
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