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infiniteQueryBehavior.test.tsx
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infiniteQueryBehavior.test.tsx
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import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest'
import { waitFor } from '@testing-library/react'
import { CancelledError, InfiniteQueryObserver } from '..'
import { createQueryClient, queryKey, sleep } from './utils'
import type { InfiniteQueryObserverResult, QueryCache, QueryClient } from '..'
describe('InfiniteQueryBehavior', () => {
let queryClient: QueryClient
let queryCache: QueryCache
beforeEach(() => {
queryClient = createQueryClient()
queryCache = queryClient.getQueryCache()
queryClient.mount()
})
afterEach(() => {
queryClient.clear()
})
test('InfiniteQueryBehavior should throw an error if the queryFn is not defined', async () => {
const key = queryKey()
const observer = new InfiniteQueryObserver(queryClient, {
queryKey: key,
retry: false,
initialPageParam: 1,
getNextPageParam: () => 2,
})
let observerResult:
| InfiniteQueryObserverResult<unknown, unknown>
| undefined
const unsubscribe = observer.subscribe((result) => {
observerResult = result
})
await waitFor(() => {
const query = queryCache.find({ queryKey: key })!
return expect(observerResult).toMatchObject({
isError: true,
error: new Error(`Missing queryFn: '${query.queryHash}'`),
})
})
unsubscribe()
})
test('InfiniteQueryBehavior should apply the maxPages option to limit the number of pages', async () => {
const key = queryKey()
let abortSignal: AbortSignal | null = null
const queryFnSpy = vi.fn().mockImplementation(({ pageParam, signal }) => {
abortSignal = signal
return pageParam
})
const observer = new InfiniteQueryObserver<number>(queryClient, {
queryKey: key,
queryFn: queryFnSpy,
getNextPageParam: (lastPage) => lastPage + 1,
getPreviousPageParam: (firstPage) => firstPage - 1,
maxPages: 2,
initialPageParam: 1,
})
let observerResult:
| InfiniteQueryObserverResult<unknown, unknown>
| undefined
const unsubscribe = observer.subscribe((result) => {
observerResult = result
})
// Wait for the first page to be fetched
await waitFor(() =>
expect(observerResult).toMatchObject({
isFetching: false,
data: { pages: [1], pageParams: [1] },
}),
)
expect(queryFnSpy).toHaveBeenNthCalledWith(1, {
queryKey: key,
pageParam: 1,
meta: undefined,
direction: 'forward',
signal: abortSignal,
})
queryFnSpy.mockClear()
// Fetch the second page
await observer.fetchNextPage()
expect(queryFnSpy).toHaveBeenNthCalledWith(1, {
queryKey: key,
pageParam: 2,
direction: 'forward',
meta: undefined,
signal: abortSignal,
})
expect(observerResult).toMatchObject({
isFetching: false,
data: { pages: [1, 2], pageParams: [1, 2] },
})
queryFnSpy.mockClear()
// Fetch the page before the first page
await observer.fetchPreviousPage()
expect(queryFnSpy).toHaveBeenNthCalledWith(1, {
queryKey: key,
pageParam: 0,
direction: 'backward',
meta: undefined,
signal: abortSignal,
})
// Only first two pages should be in the data
expect(observerResult).toMatchObject({
isFetching: false,
data: { pages: [0, 1], pageParams: [0, 1] },
})
queryFnSpy.mockClear()
// Fetch the page before
await observer.fetchPreviousPage()
expect(queryFnSpy).toHaveBeenNthCalledWith(1, {
queryKey: key,
pageParam: -1,
meta: undefined,
direction: 'backward',
signal: abortSignal,
})
expect(observerResult).toMatchObject({
isFetching: false,
data: { pages: [-1, 0], pageParams: [-1, 0] },
})
queryFnSpy.mockClear()
// Fetch the page after
await observer.fetchNextPage()
expect(queryFnSpy).toHaveBeenNthCalledWith(1, {
queryKey: key,
pageParam: 1,
meta: undefined,
direction: 'forward',
signal: abortSignal,
})
expect(observerResult).toMatchObject({
isFetching: false,
data: { pages: [0, 1] },
})
queryFnSpy.mockClear()
// Refetch the infinite query
await observer.refetch()
// Only 2 pages should be refetched
expect(queryFnSpy).toHaveBeenCalledTimes(2)
expect(queryFnSpy).toHaveBeenNthCalledWith(1, {
queryKey: key,
pageParam: 0,
meta: undefined,
direction: 'forward',
signal: abortSignal,
})
expect(queryFnSpy).toHaveBeenNthCalledWith(2, {
queryKey: key,
pageParam: 1,
meta: undefined,
direction: 'forward',
signal: abortSignal,
})
unsubscribe()
})
test('InfiniteQueryBehavior should support query cancellation', async () => {
const key = queryKey()
let abortSignal: AbortSignal | null = null
const queryFnSpy = vi.fn().mockImplementation(({ pageParam, signal }) => {
abortSignal = signal
sleep(10)
return pageParam
})
const observer = new InfiniteQueryObserver<number>(queryClient, {
queryKey: key,
queryFn: queryFnSpy,
getNextPageParam: (lastPage) => lastPage + 1,
getPreviousPageParam: (firstPage) => firstPage - 1,
initialPageParam: 1,
})
let observerResult:
| InfiniteQueryObserverResult<unknown, unknown>
| undefined
const unsubscribe = observer.subscribe((result) => {
observerResult = result
})
const query = observer.getCurrentQuery()
query.cancel()
// Wait for the first page to be cancelled
await waitFor(() =>
expect(observerResult).toMatchObject({
isFetching: false,
isError: true,
error: new CancelledError(),
data: undefined,
}),
)
expect(queryFnSpy).toHaveBeenCalledTimes(1)
expect(queryFnSpy).toHaveBeenNthCalledWith(1, {
queryKey: key,
pageParam: 1,
meta: undefined,
direction: 'forward',
signal: abortSignal,
})
unsubscribe()
})
test('InfiniteQueryBehavior should not refetch pages if the query is cancelled', async () => {
const key = queryKey()
let abortSignal: AbortSignal | null = null
let queryFnSpy = vi.fn().mockImplementation(({ pageParam, signal }) => {
abortSignal = signal
return pageParam
})
const observer = new InfiniteQueryObserver<number>(queryClient, {
queryKey: key,
queryFn: queryFnSpy,
getNextPageParam: (lastPage) => lastPage + 1,
getPreviousPageParam: (firstPage) => firstPage - 1,
initialPageParam: 1,
})
let observerResult:
| InfiniteQueryObserverResult<unknown, unknown>
| undefined
const unsubscribe = observer.subscribe((result) => {
observerResult = result
})
// Wait for the first page to be fetched
await waitFor(() =>
expect(observerResult).toMatchObject({
isFetching: false,
data: { pages: [1], pageParams: [1] },
}),
)
queryFnSpy.mockClear()
// Fetch the second page
await observer.fetchNextPage()
expect(observerResult).toMatchObject({
isFetching: false,
data: { pages: [1, 2], pageParams: [1, 2] },
})
expect(queryFnSpy).toHaveBeenCalledTimes(1)
expect(queryFnSpy).toHaveBeenNthCalledWith(1, {
queryKey: key,
pageParam: 2,
meta: undefined,
direction: 'forward',
signal: abortSignal,
})
queryFnSpy = vi.fn().mockImplementation(({ pageParam = 1, signal }) => {
abortSignal = signal
sleep(10)
return pageParam
})
// Refetch the query
observer.refetch()
expect(observerResult).toMatchObject({
isFetching: true,
isError: false,
})
// Cancel the query
const query = observer.getCurrentQuery()
query.cancel()
expect(observerResult).toMatchObject({
isFetching: false,
isError: true,
error: new CancelledError(),
data: { pages: [1, 2], pageParams: [1, 2] },
})
// Pages should not have been fetched
expect(queryFnSpy).toHaveBeenCalledTimes(0)
unsubscribe()
})
})