test: test for events when component updating

Author: iwusong

packages/runtime-core/__tests__/componentProps.spec.ts

@@ -669,4 +669,39 @@ describe('component props', () => {
 
     expect(Object.keys(props.msg).length).toBe(1)
   })
+
+  // #5517
+  test('events should not be props when component updating', async () => {
+    let props
+
+    function eventHandler() {}
+
+    const foo = ref(1)
+    const Child = defineComponent({
+      setup(_props) {
+        props = _props
+      },
+      emits: ['event'],
+      props: ['foo'],
+      template: `<div>{{ foo }}</div>`
+    })
+
+    const Comp = defineComponent({
+      setup() {
+        return {
+          foo,
+          eventHandler
+        }
+      },
+      components: { Child },
+      template: `<Child @event="eventHandler" :foo="foo" />`
+    })
+
+    const root = document.createElement('div')
+    domRender(h(Comp), root)
+    expect(props).not.toHaveProperty('onEvent')
+    foo.value++
+    await nextTick()
+    expect(props).not.toHaveProperty('onEvent')
+  })
 })