snapshot of https://github.com/TanStack/query.git (main, 2026-09-16; blobs > 131072B omitted)

packages/svelte-query/tests/HydrationBoundary/HydrationBoundary.svelte.test.ts

@@ -0,0 +1,47 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { render } from '@testing-library/svelte'
+import { QueryClient, dehydrate, noop } from '@tanstack/query-core'
+import { sleep } from '@tanstack/query-test-utils'
+import Base from './Base.svelte'
+
+describe('HydrationBoundary', () => {
+  let queryClient: QueryClient
+  let stringifiedState: string
+
+  beforeEach(async () => {
+    vi.useFakeTimers()
+    queryClient = new QueryClient()
+    const dehydrateClient = new QueryClient()
+    void dehydrateClient
+      .query({
+        queryKey: ['string'],
+        queryFn: () => sleep(10).then(() => 'stringCached'),
+      })
+      .catch(noop)
+    await vi.advanceTimersByTimeAsync(10)
+    const dehydrated = dehydrate(dehydrateClient)
+    stringifiedState = JSON.stringify(dehydrated)
+    dehydrateClient.clear()
+  })
+
+  afterEach(() => {
+    queryClient.clear()
+    vi.useRealTimers()
+  })
+
+  it('should hydrate queries to the cache on context', async () => {
+    const dehydratedState = JSON.parse(stringifiedState)
+
+    const rendered = render(Base, {
+      props: {
+        queryClient,
+        dehydratedState,
+        queryFn: () => sleep(20).then(() => 'string'),
+      },
+    })
+
+    expect(rendered.getByText('data: stringCached')).toBeInTheDocument()
+    await vi.advanceTimersByTimeAsync(20)
+    expect(rendered.getByText('data: string')).toBeInTheDocument()
+  })
+})