How to mock MUI DataGrid component with Testling-Library/React

To mock the MUI DataGrid component for testing with Testling-Library/React, you can use Jest as the testing framework and the jest.mock() function to create a manual mock for the DataGrid component. Here's a step-by-step guide:

1. Install Dependencies: Ensure you have Jest and Testing Library/React installed as dev dependencies:

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   npm install jest @testing-library/react @testing-library/jest-dom --save-dev
   

2. Create a Manual Mock: In your test file (e.g., DataGrid.test.js), create a manual mock for the MUI DataGrid component:

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   // DataGrid.test.js
   
   // Import the necessary dependencies
   import React from 'react';
   import { render } from '@testing-library/react';
   import { DataGrid } from '@mui/x-data-grid';
   
   // Create a manual mock for the DataGrid component
   jest.mock('@mui/x-data-grid', () => {
     return () => <div data-testid="mocked-data-grid" />;
   });
   
   // Import the component that uses DataGrid
   import MyComponent from './MyComponent';
   
   // Write your tests
   test('renders MyComponent with mocked DataGrid', () => {
     const { getByTestId } = render(<MyComponent />);
     const mockedDataGrid = getByTestId('mocked-data-grid');
     expect(mockedDataGrid).toBeInTheDocument();
   });
   

   In the above example, we use the jest.mock() function to create a mock for the @mui/x-data-grid module, returning a simple <div> element with a data-testid attribute. This mock will be used instead of the actual DataGrid component when rendering MyComponent.

3. Write the Component to Be Tested: In your application code, create the MyComponent that uses the DataGrid component:

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   // MyComponent.js
   
   import React from 'react';
   import { DataGrid } from '@mui/x-data-grid';
   
   const MyComponent = () => {
     // Your component logic and DataGrid usage here
     return (
       <div>
         <DataGrid rows={[]} columns={[]} />
       </div>
     );
   };
   
   export default MyComponent;
   

4. Run the Tests: Finally, run your tests using Jest:

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   npx jest DataGrid.test.js
   

The test will use the manual mock for the DataGrid component, rendering a simple <div> element instead of the actual MUI DataGrid. This allows you to test your component without relying on the full behavior of the MUI DataGrid, and it also speeds up the test execution.