deno.land / x / jotai@v1.8.4 / tests / immer / atomWithImmer.test.tsx

atomWithImmer.test.tsx
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import { StrictMode } from 'react'import { fireEvent, render } from '@testing-library/react'import { useAtom } from 'jotai'import { atomWithImmer } from 'jotai/immer'import { getTestProvider } from '../testUtils'
const Provider = getTestProvider()
it('atomWithImmer with useAtom', async () => { const countAtom = atomWithImmer(0)
const Parent = () => { const [count, setCount] = useAtom(countAtom) return ( <> <div>count: {count}</div> <button onClick={() => setCount((draft) => (draft = draft + 1))}> Increase </button> <button onClick={() => setCount((draft) => (draft = draft - 1))}> Decrease </button> </> ) }
const { findByText, getByText } = render( <StrictMode> <Provider> <Parent /> </Provider> </StrictMode> )
await findByText('count: 0')
fireEvent.click(getByText('Increase')) await findByText('count: 1')
fireEvent.click(getByText('Decrease')) await findByText('count: 0')})
it('atomWithImmer with WritableAtom<Value, Value> signature', async () => { const countAtom = atomWithImmer(0)
const Parent = () => { const [count, setCount] = useAtom(countAtom) return ( <> <div>count: {count}</div> <button onClick={() => setCount(count + 1)}>Increase</button> <button onClick={() => setCount(count - 1)}>Decrease</button> </> ) }
const { findByText, getByText } = render( <StrictMode> <Provider> <Parent /> </Provider> </StrictMode> )
await findByText('count: 0')
fireEvent.click(getByText('Increase')) await findByText('count: 1')
fireEvent.click(getByText('Decrease')) await findByText('count: 0')})
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a year ago