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test(svelte-query/HydrationBoundary): add test for hydrating queries to the cache on context #10179

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Merged
TkDodo merged 2 commits into from
Feb 26, 2026
+74 −0
Merged

test(svelte-query/HydrationBoundary): add test for hydrating queries to the cache on context #10179

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d4a7688
test(svelte-query/HydrationBoundary): add test for hydrating queries …
sukvvon Feb 24, 2026
1afcfd1
refactor(svelte-query/HydrationBoundary): create 'QueryClient' inside…
sukvvon Feb 24, 2026
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test(svelte-query/HydrationBoundary): add test for hydrating queries … 
…to the cache on context
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@sukvvon
sukvvon committed Feb 24, 2026
commit d4a7688bb28ec7e1bc381a9d96a1a3a21a3a6757
30 changes: 30 additions & 0 deletions packages/svelte-query/tests/HydrationBoundary/BaseExample.svelte
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<script lang="ts">
import { QueryClient } from '@tanstack/query-core'
import {
HydrationBoundary,
createQuery,
setQueryClientContext,
} from '../../src/index.js'
import type { DehydratedState } from '@tanstack/query-core'

let {
queryClient,
dehydratedState,
queryFn,
}: {
queryClient: QueryClient
dehydratedState: DehydratedState
queryFn: () => Promise<string>
} = $props()

setQueryClientContext(queryClient)

const query = createQuery(() => ({
queryKey: ['string'],
queryFn,
}))
</script>

<HydrationBoundary state={dehydratedState} options={undefined} queryClient={undefined}>
<div>data: {query.data ?? 'undefined'}</div>
</HydrationBoundary>
44 changes: 44 additions & 0 deletions packages/svelte-query/tests/HydrationBoundary/HydrationBoundary.svelte.test.ts
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import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import { render } from '@testing-library/svelte'
import { QueryClient, dehydrate } from '@tanstack/query-core'
import { sleep } from '@tanstack/query-test-utils'
import BaseExample from './BaseExample.svelte'

describe('HydrationBoundary', () => {
let stringifiedState: string

beforeEach(async () => {
vi.useFakeTimers()
const queryClient = new QueryClient()
queryClient.prefetchQuery({
queryKey: ['string'],
queryFn: () => sleep(10).then(() => 'stringCached'),
})
await vi.advanceTimersByTimeAsync(10)
const dehydrated = dehydrate(queryClient)
stringifiedState = JSON.stringify(dehydrated)
queryClient.clear()
})

afterEach(() => {
vi.useRealTimers()
})

it('should hydrate queries to the cache on context', async () => {
const dehydratedState = JSON.parse(stringifiedState)
const queryClient = new QueryClient()

const rendered = render(BaseExample, {
props: {
queryClient,
dehydratedState,
queryFn: () => sleep(20).then(() => 'string'),
},
})

expect(rendered.getByText('data: stringCached')).toBeInTheDocument()
await vi.advanceTimersByTimeAsync(21)
expect(rendered.getByText('data: string')).toBeInTheDocument()
queryClient.clear()
})
})
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