Only the react-query test code does not run in Jest 29.7 with MSW 2.3.1? Here’s the Fix!

Are you frustrated because your react-query test code refuses to run in Jest 29.7 with MSW 2.3.1? You’re not alone! Many developers have faced this issue, and today, we’re going to tackle it head-on. In this article, we’ll explore the possible causes, solutions, and workarounds to get your tests up and running in no time.

Understanding the Problem

Before we dive into the solutions, let’s understand what might be causing this issue. There are a few possible reasons why your react-query test code is not running in Jest 29.7 with MSW 2.3.1:

• Incompatible versions**: Are you using incompatible versions of react-query, Jest, and MSW? This could be the culprit.
• Config issues**: Is your Jest configuration incorrect or incomplete? This might prevent your tests from running.
• Mocking issues**: Are you using MSW correctly? Incorrect mocking can cause tests to fail or not run at all.
• React-query setup**: Is your react-query setup correct? A misconfigured react-query setup can lead to test failures.

Solution 1: Update Your Dependencies

Let’s start with the easiest solution: updating your dependencies. Ensure you’re using compatible versions of react-query, Jest, and MSW. Here are the latest versions at the time of writing:

Library	Version
react-query	3.34.0
Jest	29.7.0
MSW	2.3.1

Update your `package.json` file with the latest versions:

"dependencies": {
  "react-query": "^3.34.0",
  "jest": "^29.7.0",
  "msw": "^2.3.1"
}

Run `npm install` or `yarn install` to update your dependencies.

Solution 2: Configure Jest Correctly

Jest configuration is crucial for running tests. Ensure you have a correct `jest.config.js` file. Here’s an example:

module.exports = {
  preset: 'ts-jest',
  globals: {
    'ts-jest': {
      tsconfig: 'tsconfig.json',
    },
  },
  moduleFileExtensions: ['js', 'jsx', 'ts', 'tsx'],
  moduleNameMapper: {
    '^react-native$': 'react-native-web',
  },
  transform: {
    '^.+\\.(js|jsx|ts|tsx)$': 'babel-jest',
  },
  transformIgnorePatterns: [
    'node_modules/(?!(jest-)?react|react-native|@react-native-community|@react-native)',
  ],
};

Make sure to adjust the configuration according to your project’s needs.

Solution 3: Mock MSW Correctly

MSW (Mock Service Worker) is a powerful tool for mocking API requests. However, incorrect mocking can cause tests to fail. Ensure you’re using MSW correctly:

import { rest } from 'msw';
import { setupServer } from 'msw';

const handlers = [
  rest.get('https://api.example.com/data', (req, res, ctx) => {
    return res(ctx.json({ data: 'Mocked data' }));
  }),
];

const server = setupServer(...handlers);

beforeAll(() => server.listen());
afterAll(() => server.close());
afterEach(() => server.resetHandlers());

This example sets up an MSW server with a single handler for a GET request to `https://api.example.com/data`. Adjust the handlers according to your API needs.

Solution 4: Configure React-Query Correctly

React-query is a powerful data fetching and caching library. Ensure you’re setting it up correctly:

import { QueryClient, QueryClientProvider } from 'react-query';
import { render } from '@testing-library/react';

const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      retry: false,
    },
  },
});

const customRender = (ui, options = {}) =>
  render(
    
      {ui}
    ,
    { ...options }
  );

export * from '@testing-library/react';
export { customRender as render };

This example sets up a custom render function with react-query. Adjust the configuration according to your needs.

Workaround: Disable MSW for Specific Tests

In some cases, you might want to disable MSW for specific tests. You can do this by adding an `msw` option to your test:

import { render } from '@testing-library/react';

describe('MyComponent', () => {
  it('renders correctly', () => {
    return render(
      ,
      {
        msw: {
          enabled: false,
        },
      }
    );
  });
});

This disables MSW for the specific test.

Conclusion

Getting react-query test code to run in Jest 29.7 with MSW 2.3.1 can be challenging, but by following these solutions and workarounds, you should be able to overcome the issues. Remember to:

1. Update your dependencies to compatible versions.
2. Configure Jest correctly.
3. Mock MSW correctly.
4. Configure react-query correctly.
5. Disable MSW for specific tests if needed.

By following these steps, you’ll be able to write and run react-query tests with confidence. Happy testing!

Keywords: react-query, Jest, MSW, testing, JavaScript, react, testing library, jest config, msw setup, react-query setup.

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