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context.js
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context.js
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// @flow
import { throwIfFalsy, safeQuerySelector } from 'test-utils'
import * as React from 'emotion-react-mock-for-preact'
import { render as preactRender } from 'preact'
function render(element) {
preactRender(element, safeQuerySelector('#root'))
}
beforeEach(() => {
throwIfFalsy(document.body).innerHTML = `<div id="root"></div>`
})
test('default', () => {
let defaultContext = <div>it works!!</div>
let { Consumer } = React.createContext(defaultContext)
render(<Consumer>{element => element}</Consumer>)
expect(document.documentElement).toMatchSnapshot()
})
test('with provider', () => {
let defaultContext = <div>it works!!</div>
let { Consumer, Provider } = React.createContext(defaultContext)
render(
<Provider value={<div>this is the actual value!!</div>}>
<Consumer>{element => element}</Consumer>
</Provider>
)
expect(document.documentElement).toMatchSnapshot()
})
test('provider without children', () => {
let defaultContext = <div>it works!!</div>
let { Provider } = React.createContext(defaultContext)
render(
<div>
some content
<Provider value={<div>this is the actual value!!</div>} />
</div>
)
expect(document.documentElement).toMatchSnapshot()
})
test('provider change', cb => {
let firstContextValue = 'first'
let secondContextValue = 'second'
let { Provider, Consumer } = React.createContext(null)
class ThingThatDoesSomething extends React.Component<{}, *> {
state = { value: firstContextValue }
render() {
return (
<Provider value={this.state.value}>
<Consumer>{value => <button id="thing">{value}</button>}</Consumer>
</Provider>
)
}
}
// $FlowFixMe
let ref: ThingThatDoesSomething
render(<ThingThatDoesSomething ref={node => (ref = node)} />)
expect(safeQuerySelector('#thing').textContent).toBe(firstContextValue)
ref.setState({ value: secondContextValue }, () => {
expect(safeQuerySelector('#thing').textContent).toBe(secondContextValue)
cb()
})
})
test('does not throw on unmount', () => {
let { Provider, Consumer } = React.createContext(null)
render(
<Provider value={'value'}>
<Consumer>{value => <div>{value}</div>}</Consumer>
</Provider>
)
preactRender(
null,
safeQuerySelector('#root'),
throwIfFalsy(safeQuerySelector('#root').firstChild)
)
})