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suspenseHook.test.ts
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suspenseHook.test.ts
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import { renderHook } from '..'
describe('suspense hook tests', () => {
const cache: { value?: Promise<string | Error> | string | Error } = {}
const fetchName = (isSuccessful: boolean) => {
if (!cache.value) {
cache.value = new Promise<string>((resolve, reject) => {
setTimeout(() => {
if (isSuccessful) {
resolve('Bob')
} else {
reject(new Error('Failed to fetch name'))
}
}, 50)
})
.then((value) => (cache.value = value))
.catch((e: Error) => (cache.value = e))
}
return cache.value
}
const useFetchName = (isSuccessful = true) => {
const name = fetchName(isSuccessful)
if (name instanceof Promise || name instanceof Error) {
throw name as unknown
}
return name
}
beforeEach(() => {
delete cache.value
})
test('should allow rendering to be suspended', async () => {
const { result, waitForNextUpdate } = renderHook(() => useFetchName(true))
await waitForNextUpdate()
expect(result.current).toBe('Bob')
})
test('should set error if suspense promise rejects', async () => {
const { result, waitForNextUpdate } = renderHook(() => useFetchName(false))
await waitForNextUpdate()
expect(result.error).toEqual(new Error('Failed to fetch name'))
})
test('should return undefined if current value is requested before suspension has resolved', async () => {
const { result } = renderHook(() => useFetchName(true))
expect(result.current).toBe(undefined)
})
})