implementing Jest mocking for a module with dynamic imports in a React application
I've been banging my head against this for hours. I'm currently working on a React application using Jest for testing. I've run into an scenario where I need to mock a module that's being dynamically imported within one of my components. My setup uses React 17 and Jest 27. The component looks something like this: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = () => { const [data, setData] = useState(null); useEffect(() => { const fetchData = async () => { const module = await import('./api'); const result = await module.getData(); setData(result); }; fetchData(); }, []); return <div>{data ? JSON.stringify(data) : 'Loading...'}</div>; }; export default MyComponent; ``` I want to test this component, specifically the part where it fetches data from the dynamically imported `api` module. I've tried the following test setup: ```javascript import React from 'react'; import { render, screen, waitFor } from '@testing-library/react'; import MyComponent from './MyComponent'; jest.mock('./api', () => ({ getData: jest.fn(() => Promise.resolve({ name: 'Test' })) })); test('loads and displays data', async () => { render(<MyComponent />); await waitFor(() => expect(screen.getByText(/Loading/i)).toBeInTheDocument()); await waitFor(() => expect(screen.getByText(/Test/i)).toBeInTheDocument()); }); ``` However, I'm working with the following behavior when I run the test: ``` TypeError: want to read properties of undefined (reading 'getData') ``` It seems like the mock is not being recognized when the module is dynamically imported. I’ve confirmed that the path to the module is correct and that Jest's module mocking system should work, but it doesn’t seem to be applying in this case. I've also looked into using `jest.mock` with a factory function, but I'm still working with issues. Can anyone provide guidance on how to properly mock a dynamically imported module in Jest? Any insights or examples would be greatly appreciated! My development environment is Linux. Has anyone else encountered this?