# React

[React](https://reactjs.org/) makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. You can test React components directly in a real browser using WebdriverIO and its [browser runner](/docs/runner.md#browser-runner).

## Setup[​](#setup "Direct link to Setup")

To setup WebdriverIO within your React project, follow the [instructions](/docs/component-testing.md#set-up) in our component testing docs. Make sure to select `react` as preset within your runner options, e.g.:

```
// wdio.conf.js
export const config = {
    // ...
    runner: ['browser', {
        preset: 'react'
    }],
    // ...
}
```

info

If you are already using [Vite](https://vitejs.dev/) as development server you can also just re-use your configuration in `vite.config.ts` within your WebdriverIO config. For more information, see `viteConfig` in [runner options](/docs/runner.md#runner-options).

The React preset requires `@vitejs/plugin-react` to be installed. Also we recommend using [Testing Library](https://testing-library.com/) for rendering the component into the test page. Therefor you'll need to install the following additional dependencies:

* npm
* Yarn
* pnpm
* Bun

```
npm install --save-dev @testing-library/react @vitejs/plugin-react
```

```
yarn add --dev @testing-library/react @vitejs/plugin-react
```

```
pnpm add --save-dev @testing-library/react @vitejs/plugin-react
```

```
bun add --dev @testing-library/react @vitejs/plugin-react
```

You can then start the tests by running:

```
npx wdio run ./wdio.conf.js
```

## Writing Tests[​](#writing-tests "Direct link to Writing Tests")

Given you have the following React component:

./components/Component.jsx

```
import React, { useState } from 'react'

function App() {
    const [theme, setTheme] = useState('light')

    const toggleTheme = () => {
        const nextTheme = theme === 'light' ? 'dark' : 'light'
        setTheme(nextTheme)
    }

    return <button onClick={toggleTheme}>
        Current theme: {theme}
    </button>
}

export default App
```

In your test use the `render` method from `@testing-library/react` to attach the component to the test page. To interact with the component we recommend to use WebdriverIO commands as they behave more close to actual user interactions, e.g.:

app.test.tsx

```
import { expect } from '@wdio/globals'
import { render, screen } from '@testing-library/react'
import userEvent from '@testing-library/user-event'

import * as matchers from '@testing-library/jest-dom/matchers'
expect.extend(matchers)

import App from './components/Component.jsx'

describe('React Component Testing', () => {
    it('Test theme button toggle', async () => {
        render(<App />)
        const buttonEl = screen.getByText(/Current theme/i)

        await $(buttonEl).click()
        expect(buttonEl).toContainHTML('dark')
    })
})
```

You can find a full example of a WebdriverIO component test suite for React in our [example repository](https://github.com/webdriverio/component-testing-examples/tree/main/react-typescript-vite).