fix(spy): clear/reset/restore mocks in stack order (#7499)

packages/spy/src/index.ts

@@ -412,7 +412,6 @@ export type Mocked<T> = {
       : T[P];
 } & T
 
-const vitestSpy = Symbol.for('vitest.spy')
 export const mocks: Set<MockInstance> = new Set()
 
 export function isMockFunction(fn: any): fn is MockInstance {
@@ -421,20 +420,6 @@ export function isMockFunction(fn: any): fn is MockInstance {
   )
 }
 
-function getSpy(
-  obj: unknown,
-  method: keyof any,
-  accessType?: 'get' | 'set',
-): MockInstance | undefined {
-  const desc = Object.getOwnPropertyDescriptor(obj, method)
-  if (desc) {
-    const fn = desc[accessType ?? 'value']
-    if (typeof fn === 'function' && vitestSpy in fn) {
-      return fn
-    }
-  }
-}
-
 export function spyOn<T, S extends Properties<Required<T>>>(
   obj: T,
   methodName: S,
@@ -464,11 +449,6 @@ export function spyOn<T, K extends keyof T>(
   } as const
   const objMethod = accessType ? { [dictionary[accessType]]: method } : method
 
-  const currentStub = getSpy(obj, method, accessType)
-  if (currentStub) {
-    return currentStub
-  }
-
   const stub = tinyspy.internalSpyOn(obj, objMethod as any)
 
   return enhanceSpy(stub) as MockInstance
@@ -542,11 +522,6 @@ function enhanceSpy<T extends Procedure>(
 
   let name: string = (stub as any).name
 
-  Object.defineProperty(stub, vitestSpy, {
-    value: true,
-    enumerable: false,
-  })
-
   stub.getMockName = () => name || 'vi.fn()'
   stub.mockName = (n) => {
     name = n

packages/vitest/src/integrations/vi.ts

@@ -616,17 +616,17 @@ function createVitest(): VitestUtils {
     },
 
     clearAllMocks() {
-      mocks.forEach(spy => spy.mockClear())
+      [...mocks].reverse().forEach(spy => spy.mockClear())
       return utils
     },
 
     resetAllMocks() {
-      mocks.forEach(spy => spy.mockReset())
+      [...mocks].reverse().forEach(spy => spy.mockReset())
       return utils
     },
 
     restoreAllMocks() {
-      mocks.forEach(spy => spy.mockRestore())
+      [...mocks].reverse().forEach(spy => spy.mockRestore())
       return utils
     },
 

test/core/test/jest-mock.test.ts

@@ -363,7 +363,7 @@ describe('jest mock compat layer', () => {
     expect(obj.property).toBe(true)
   })
 
-  it('spyOn returns the same spy twice', () => {
+  it('spyOn multiple times', () => {
     const obj = {
       method() {
         return 'original'
@@ -375,19 +375,40 @@ describe('jest mock compat layer', () => {
 
     expect(vi.isMockFunction(obj.method)).toBe(true)
     expect(obj.method()).toBe('mocked')
-    expect(spy1).toBe(spy2)
+    expect(spy1).not.toBe(spy2)
 
     spy2.mockImplementation(() => 'mocked2')
 
     expect(obj.method()).toBe('mocked2')
 
     spy2.mockRestore()
 
-    expect(obj.method()).toBe('original')
+    expect(obj.method()).toBe('mocked')
+    expect(vi.isMockFunction(obj.method)).toBe(true)
+    expect(obj.method).toBe(spy1)
+
+    spy1.mockRestore()
     expect(vi.isMockFunction(obj.method)).toBe(false)
     expect(obj.method).not.toBe(spy1)
   })
 
+  it('restoreAllMocks in stack order', () => {
+    const obj = { foo: () => 'foo' }
+
+    vi.spyOn(obj, 'foo').mockImplementation(() => 'mocked1')
+    expect(obj.foo()).toBe('mocked1')
+    expect(vi.isMockFunction(obj.foo)).toBe(true)
+
+    vi.spyOn(obj, 'foo').mockImplementation(() => 'mocked2')
+    expect(obj.foo()).toBe('mocked2')
+    expect(vi.isMockFunction(obj.foo)).toBe(true)
+
+    vi.restoreAllMocks()
+
+    expect(obj.foo()).toBe('foo')
+    expect(vi.isMockFunction(obj.foo)).toBe(false)
+  })
+
   it('should spy on property setter (2), and mockReset should not restore original descriptor', () => {
     const obj = {
       _property: false,