ernbrn/react-fake-props

🔮 Magically generate fake props for your React tests

react-fake-props

Magically generate fake props for your React tests 🔮

react-fake-props parses your Component prop types using react-docgen and generates fake props. Supports Flow and PropTypes. Works great with Jest snapshots and Enzyme.

Install

yarn add react-fake-props --dev

npm install react-fake-props --save-dev

Example

Assuming the following Component with Flow types:

// @flow
type Props = {
  id: number,
  name: string
}

class Component extends React.Component<Props> {
  // ...
}

Or PropTypes:

class Component extends React.Component {
  // ...
}

Component.propTypes = {
  id: PropTypes.number.isRequired,
  name: PropTypes.string.isRequired
}

With react-fake-props, you can generate valid props based on your Component prop types:

const props = fakeProps(componentPath)
/*
{
  id: 1,
  name: 'name'
}
*/
<Component {...props} />

Usage

import path from 'path'
import fakeProps from 'react-fake-props'

const componentPath = path.join(__dirname, './Component.jsx')
const props = fakeProps(componentPath)

To include optional props, pass { optional: true }.

Please note:

• custom validators and PropTypes.instanceOf aren't supported, you'll still need to set them manually.
• react-fake-props requires the component path to be passed, instead of the component itself, to be able to support Flow and PropTypes.

API

fakeProps(componentPath[, { optional: false } ])

Tip

When checking for a value, use props.A rather than 'A' as react-fake-props output may change.

const wrapper = shallow(<Component {...props} />)

wrapper.text().to.contain('A') // bad
wrapper.text().to.contain(props.A) // good

License

MIT - Typicode 🌵 - Patreon