Testing with Jest

React Native Worklets is primarily a native library, for that reason it requires a proper setup to be tested with Jest. This guide will show you how to set it up when testing in a React Native project.

You have two options for this:

1. Enforce the use of mock implementation for React Native Worklets.

   React Native Worklets provides a complete mock implementation for Jest. This is the recommended approach for testing.

2. Enforce the use of Web implementation for React Native Worklets.

   React Native Worklets has a separate Web implementation to use in the browser. Use this approach when you want to avoid using artifical mocks.

Using the mock implementation

Depending on whether you are using TypeScript or JavaScript, apply the following mock:

TypeScript

jest.mock('react-native-worklets', () =>
  require('react-native-worklets/src/mock')
);

JavaScript

jest.mock('react-native-worklets', () =>
  require('react-native-worklets/lib/module/mock')
);

Using the Web implementation

Available from 0.8.x

Override Jest resolver to enforce resolving web implementation of React Native Worklets instead of pulling the native one. Modify your jest.config.js file to include the following code:

module.exports = {
  // ... other configurations
  resolver: 'react-native-worklets/jest/resolver',
};