Invariant Violation: new NativeEventEmitter()
Started 10 months ago by John in React Native
react native test case error with new NativeEventEmitter error
Body
Invariant Violation: `new NativeEventEmitter()` requires a non-null argument.
__tests__/App-test.tsx
● Test suite failed to run
Invariant Violation: `new NativeEventEmitter()` requires a non-null argument.
5 | import {useSafeAreaInsets} from 'react-native-safe-area-context';
6 | // import RoundIconButton from "./RoundIconButton";
> 7 | import DeviceInfo from 'react-native-device-info';
| ^
8 | const isIphoneX = DeviceInfo.hasNotch();
at invariant (node_modules/invariant/invariant.js:40:15)
at new NativeEventEmitter (node_modules/react-native/Libraries/EventEmitter/NativeEventEmitter.js:46:16) at Object.<anonymous> (node_modules/react-native-device-info/lib/commonjs/internal/asyncHookWrappers.ts:29:34)
at Object.require (node_modules/react-native-device-info/lib/commonjs/index.ts:3:1)
at Object.require (src/component/molecule/Header/TopHeaderContent.tsx:7:1)
at Object.require (src/component/molecule/index.tsx:9:1)
at Object.require (src/screens/main/Homescreen/index.tsx:108:1)
at Object.require (__tests__/App-test.tsx:5:1)1 Replies
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@DSK
Create a
__mocks__directory: In your project's root directory, create a__mocks__directory. Inside it, create a file namedreact-native-device-info.js// __mocks__/react-native-device-info.js const DeviceInfo = jest.genMockFromModule('react-native-device-info'); DeviceInfo.hasNotch = jest.fn().mockReturnValue(false); // Mock the hasNotch function to return false module.exports = DeviceInfo;Configure Jest to use the mocks: Ensure that Jest is configured to use the
__mocks__directory. In yourpackage.json, add or update thejestsection:"jest": { "preset": "react-native", "moduleNameMapper": { "^react-native-device-info$": "<rootDir>/__mocks__/react-native-device-info.js" } }