i have a simple hook that fetches the value and sets it to option as follows:
import Fuse from 'fuse.js'
import React from 'react'
// prefetches options and uses fuzzy search to search on that option
// instead of fetching on each keystroke
export function usePrefetchedOptions<T extends {}>(fetcher: () => Promise<T[]>) {
const [options, setOptions] = React.useState<T[]>([])
React.useEffect(() => {
// fetch options initially
const optionsFetcher = async () => {
try {
const data = await fetcher()
setOptions(data)
} catch (err) {
errorSnack(err)
}
}
optionsFetcher()
}, [])
// const fuseOptions = {
// isCaseSensitive: false,
// keys: ['name'],
// }
// const fuse = new Fuse(options, fuseOptions)
// const dataServiceProxy = (options) => (pattern: string) => {
// // console.error('options inside proxy call', { options })
// const optionsFromSearch = fuse.search(pattern).map((fuzzyResult) => fuzzyResult.item)
// return new Promise((resolve) => resolve(pattern === '' ? options : optionsFromSearch))
// }
return options
}
i am trying to test it with following code:
import { act, renderHook, waitFor } from '@testing-library/react-hooks'
import { Wrappers } from './test-utils'
import { usePrefetchedOptions } from './usePrefetchedOptions'
import React from 'react'
const setup = ({ fetcher }) => {
const {
result: { current },
waitForNextUpdate,
...rest
} = renderHook(() => usePrefetchedOptions(fetcher), { wrapper: Wrappers })
return { current, waitForNextUpdate, ...rest }
}
describe('usePrefetchedOptions', () => {
const mockOptions = [
{
value: 'value1',
text: 'Value one',
},
{
value: 'value2',
text: 'Value two',
},
{
value: 'value3',
text: 'Value three',
},
]
test('searches for appropriate option', async () => {
const fetcher = jest.fn(() => new Promise((resolve) => resolve(mockOptions)))
const { rerender, current: options, waitForNextUpdate } = setup({ fetcher })
await waitFor(() => {
expect(fetcher).toHaveBeenCalled()
})
// async waitForNextUpdate()
expect(options).toHaveLength(3) // returns initial value of empty options = []
})
})
the problem is when i am trying to assert the options at the end of the test, it still has the initial value of []
. However if I log the value inside the hook, it returns the mockOptions. How do I update the hook after it is update by useEffect but in async manner.
I have also tried using using waitForNextUpdate
where it is commented in the code. it times out with following error: Timeout - Async callback was not invoked within the 5000 ms timeout specified by jest.setTimeout.Timeout - Async callback was not invoked within the 5000 ms timeout specified by jest.setTimeout.Error:
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