test(reactivity): test for verifying no unnecessary calls of reactive array identity methods (#11328)

related: #9511

packages/reactivity/__tests__/reactiveArray.spec.ts

@@ -89,6 +89,80 @@ describe('reactivity/reactive/Array', () => {
     expect(index).toBe(1)
   })
 
+  // only non-existent reactive will try to search by using its raw value
+  describe('Array identity methods have been called times', () => {
+    const identityMethods = ['includes', 'indexOf', 'lastIndexOf'] as const
+    function instrumentArr(rawTarget: any[]) {
+      identityMethods.forEach(key => {
+        const spy = vi.fn(rawTarget[key] as any)
+        rawTarget[key] = spy
+      })
+    }
+    function searchValue(target: any[], ...args: unknown[]) {
+      return identityMethods.map(key => (target[key] as any)(...args))
+    }
+    function unInstrumentArr(rawTarget: any[]) {
+      identityMethods.forEach(key => {
+        ;(rawTarget[key] as any).mockClear()
+        // relink to prototype method
+        rawTarget[key] = Array.prototype[key] as any
+      })
+    }
+    function expectHaveBeenCalledTimes(rawTarget: any[], times: number) {
+      identityMethods.forEach(key => {
+        expect(rawTarget[key]).toHaveBeenCalledTimes(times)
+      })
+    }
+
+    test('should be called once with a non-existent raw value', () => {
+      const reactiveArr = reactive([])
+      instrumentArr(toRaw(reactiveArr))
+      const searchResult = searchValue(reactiveArr, {})
+
+      expectHaveBeenCalledTimes(toRaw(reactiveArr), 1)
+      expect(searchResult).toStrictEqual([false, -1, -1])
+
+      unInstrumentArr(toRaw(reactiveArr))
+    })
+
+    test('should be called once with an existent reactive value', () => {
+      const existReactiveValue = reactive({})
+      const reactiveArr = reactive([existReactiveValue, existReactiveValue])
+
+      instrumentArr(toRaw(reactiveArr))
+      const searchResult = searchValue(reactiveArr, existReactiveValue)
+
+      expectHaveBeenCalledTimes(toRaw(reactiveArr), 1)
+      expect(searchResult).toStrictEqual([true, 0, 1])
+
+      unInstrumentArr(toRaw(reactiveArr))
+    })
+
+    test('should be called twice with a non-existent reactive value', () => {
+      const reactiveArr = reactive([])
+      instrumentArr(toRaw(reactiveArr))
+      const searchResult = searchValue(reactiveArr, reactive({}))
+
+      expectHaveBeenCalledTimes(toRaw(reactiveArr), 2)
+      expect(searchResult).toStrictEqual([false, -1, -1])
+
+      unInstrumentArr(toRaw(reactiveArr))
+    })
+
+    test('should be called twice with a non-existent reactive value, but the raw value exists', () => {
+      const existRaw = {}
+      const reactiveArr = reactive([existRaw, existRaw])
+
+      instrumentArr(toRaw(reactiveArr))
+      const searchResult = searchValue(reactiveArr, reactive(existRaw))
+
+      expectHaveBeenCalledTimes(toRaw(reactiveArr), 2)
+      expect(searchResult).toStrictEqual([true, 0, 1])
+
+      unInstrumentArr(toRaw(reactiveArr))
+    })
+  })
+
   test('delete on Array should not trigger length dependency', () => {
     const arr = reactive([1, 2, 3])
     const fn = vi.fn()