test: add test case

packages/runtime-dom/__tests__/patchProps.spec.ts

@@ -1,5 +1,12 @@
 import { patchProp } from '../src/patchProp'
-import { h, nextTick, ref, render } from '../src'
+import {
+  h,
+  nextTick,
+  ref,
+  render,
+  vModelCheckbox,
+  withDirectives,
+} from '../src'
 
 describe('runtime-dom: props patching', () => {
   test('basic', () => {
@@ -351,4 +358,40 @@ describe('runtime-dom: props patching', () => {
     expect(el.translate).toBeFalsy()
     expect(el.getAttribute('translate')).toBe('no')
   })
+
+  // #11647
+  test('should not trigger input mutation when `value` is `undefined`', async () => {
+    const fn = vi.fn()
+    const comp = {
+      setup() {
+        const checked = ref()
+        return () =>
+          withDirectives(
+            h('input', {
+              type: 'checkbox',
+              value: undefined,
+              'onUpdate:modelValue': (value: any) => {
+                checked.value = value
+              },
+            }),
+            [[vModelCheckbox, checked.value]],
+          )
+      },
+    }
+
+    const root = document.createElement('div')
+    render(h(comp), root)
+    document.body.append(root)
+
+    const el = root.children[0] as HTMLInputElement
+    const observer = new MutationObserver(fn)
+    observer.observe(el, {
+      attributes: true,
+    })
+
+    el.click()
+    await nextTick()
+
+    expect(fn).toBeCalledTimes(0)
+  })
 })