From e72096fbee9a15c3318a810068efeb0d10be209c Mon Sep 17 00:00:00 2001
From: Wonsuk Choi <sukvvon@gmail.com>
Date: Sun, 28 Dec 2025 15:43:37 +0900
Subject: [PATCH 1/2] test(react-query/ssr): add 'useMutation' and
 'useMutationState' tests for SSR

---
 .../react-query/src/__tests__/ssr.test.tsx    | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/packages/react-query/src/__tests__/ssr.test.tsx b/packages/react-query/src/__tests__/ssr.test.tsx
index 0738b8d290..9816664b82 100644
--- a/packages/react-query/src/__tests__/ssr.test.tsx
+++ b/packages/react-query/src/__tests__/ssr.test.tsx
@@ -7,6 +7,8 @@ import {
   QueryClient,
   QueryClientProvider,
   useInfiniteQuery,
+  useMutation,
+  useMutationState,
   useQuery,
 } from '..'
 import { setIsServer } from './utils'
@@ -173,4 +175,38 @@ describe('Server Side Rendering', () => {
 
     queryCache.clear()
   })
+
+  it('useMutation should return idle status', () => {
+    function Page() {
+      const mutation = useMutation({
+        mutationFn: () => sleep(10).then(() => 'data'),
+      })
+
+      return <div>{`status: ${mutation.status}`}</div>
+    }
+
+    const markup = renderToString(
+      <QueryClientProvider client={queryClient}>
+        <Page />
+      </QueryClientProvider>,
+    )
+
+    expect(markup).toContain('status: idle')
+  })
+
+  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')
+  })
 })

From b886a33ae985307a05f22195fc9f3f3d4d8461a0 Mon Sep 17 00:00:00 2001
From: Wonsuk Choi <sukvvon@gmail.com>
Date: Sun, 28 Dec 2025 22:27:38 +0900
Subject: [PATCH 2/2] test(react-query/ssr): add 'queryCache.clear()' to
 'useMutation' and 'useMutationState' tests

---
 packages/react-query/src/__tests__/ssr.test.tsx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/react-query/src/__tests__/ssr.test.tsx b/packages/react-query/src/__tests__/ssr.test.tsx
index 4e70452c74..4977a2325a 100644
--- a/packages/react-query/src/__tests__/ssr.test.tsx
+++ b/packages/react-query/src/__tests__/ssr.test.tsx
@@ -224,6 +224,8 @@ describe('Server Side Rendering', () => {
     )
 
     expect(markup).toContain('status: idle')
+
+    queryCache.clear()
   })
 
   it('useMutationState should return empty array', () => {
@@ -240,5 +242,7 @@ describe('Server Side Rendering', () => {
     )
 
     expect(markup).toContain('mutationState: 0')
+
+    queryCache.clear()
   })
 })