From 345734a6c5101ad3c49bbff32ba684a7af5116e9 Mon Sep 17 00:00:00 2001
From: Wonsuk Choi <sukvvon@gmail.com>
Date: Wed, 18 Feb 2026 18:19:40 +0900
Subject: [PATCH] test(preact-query/ssr): add test for 'useMutationState'
 returning empty array

---
 .../preact-query/src/__tests__/ssr.test.tsx   | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/packages/preact-query/src/__tests__/ssr.test.tsx b/packages/preact-query/src/__tests__/ssr.test.tsx
index d365c474ae2..d543a57501f 100644
--- a/packages/preact-query/src/__tests__/ssr.test.tsx
+++ b/packages/preact-query/src/__tests__/ssr.test.tsx
@@ -8,6 +8,7 @@ import {
   QueryClient,
   QueryClientProvider,
   useInfiniteQuery,
+  useMutationState,
   useQuery,
 } from '..'
 import { setIsServer } from './utils'
@@ -136,6 +137,24 @@ describe('Server Side Rendering', () => {
     queryCache.clear()
   })
 
+  it('useMutationState should return empty array', () => {
+    function Page() {
+      const mutationState = useMutationState()
+
+      return <div>{`mutationState: ${mutationState.length}`}</div>
+    }
+
+    const markup = renderToString(
+      <QueryClientProvider client={queryClient}>
+        <Page />
+      </QueryClientProvider>,
+    )
+
+    expect(markup).toContain('mutationState: 0')
+
+    queryCache.clear()
+  })
+
   it('useInfiniteQuery should return the correct state', async () => {
     const key = queryKey()
     const queryFn = vi.fn(() => sleep(10).then(() => 'page 1'))