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import React, {useEffect} from 'react'
import {configure, renderHook} from '../pure'
const isReact18 = React.version.startsWith('18.')
const isReact19 = React.version.startsWith('19.')
const testGateReact18 = isReact18 ? test : test.skip
const testGateReact19 = isReact19 ? test : test.skip
test('gives committed result', () => {
const {result} = renderHook(() => {
const [state, setState] = React.useState(1)
React.useEffect(() => {
setState(2)
}, [])
return [state, setState]
})
expect(result.current).toEqual([2, expect.any(Function)])
})
test('allows rerendering', () => {
const {result, rerender} = renderHook(
({branch}) => {
const [left, setLeft] = React.useState('left')
const [right, setRight] = React.useState('right')
// eslint-disable-next-line jest/no-if, jest/no-conditional-in-test -- false-positive
switch (branch) {
case 'left':
return [left, setLeft]
case 'right':
return [right, setRight]
default:
throw new Error(
'No Props passed. This is a bug in the implementation',
)
}
},
{initialProps: {branch: 'left'}},
)
expect(result.current).toEqual(['left', expect.any(Function)])
rerender({branch: 'right'})
expect(result.current).toEqual(['right', expect.any(Function)])
})
test('allows wrapper components', async () => {
const Context = React.createContext('default')
function Wrapper({children}) {
return <Context.Provider value="provided">{children}</Context.Provider>
}
const {result} = renderHook(
() => {
return React.useContext(Context)
},
{
wrapper: Wrapper,
},
)
expect(result.current).toEqual('provided')
})
testGateReact18('legacyRoot uses legacy ReactDOM.render', () => {
const Context = React.createContext('default')
function Wrapper({children}) {
return <Context.Provider value="provided">{children}</Context.Provider>
}
let result
expect(() => {
result = renderHook(
() => {
return React.useContext(Context)
},
{
wrapper: Wrapper,
legacyRoot: true,
},
).result
}).toErrorDev(
[
"Warning: ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17. Learn more: https://reactjs.org/link/switch-to-createroot",
],
{withoutStack: true},
)
expect(result.current).toEqual('provided')
})
testGateReact19('legacyRoot throws', () => {
const Context = React.createContext('default')
function Wrapper({children}) {
return <Context.Provider value="provided">{children}</Context.Provider>
}
expect(() => {
renderHook(
() => {
return React.useContext(Context)
},
{
wrapper: Wrapper,
legacyRoot: true,
},
).result
}).toThrowErrorMatchingInlineSnapshot(
`\`legacyRoot: true\` is not supported in this version of React. If your app runs React 19 or later, you should remove this flag. If your app runs React 18 or earlier, visit https://react.dev/blog/2022/03/08/react-18-upgrade-guide for upgrade instructions.`,
)
})
describe('reactStrictMode', () => {
let originalConfig
beforeEach(() => {
// Grab the existing configuration so we can restore
// it at the end of the test
configure(existingConfig => {
originalConfig = existingConfig
// Don't change the existing config
return {}
})
})
afterEach(() => {
configure(originalConfig)
})
test('reactStrictMode in renderOptions has precedence over config when rendering', () => {
const hookMountEffect = jest.fn()
configure({reactStrictMode: false})
renderHook(() => useEffect(() => hookMountEffect()), {
reactStrictMode: true,
})
expect(hookMountEffect).toHaveBeenCalledTimes(2)
})
})
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