feat(vitest): support vi.waitFor method

docs/api/vi.md

@@ -775,3 +775,4 @@ test('Server started successfully', async () => {
 })
 ```
 
+If `vi.useFakeTimers` is used, `vi.waitFor` automatically calls `vi.AdvanceTimersByTime(interval)` in every check callback.

packages/vitest/src/integrations/wait.ts

@@ -1,4 +1,5 @@
 import { getSafeTimers } from '@vitest/utils'
+import { vi } from './vi'
 
 // The waitFor function was inspired by https://github.com/testing-library/web-testing-library/pull/2
 
@@ -52,6 +53,10 @@ export function waitFor<T>(callback: WaitForCallback<T>, options: number | WaitF
     }
 
     const checkCallback = () => {
+      // use fake timers
+      if (globalThis.setTimeout !== setTimeout)
+        vi.advanceTimersByTime(interval)
+
       if (promiseStatus === 'pending')
         return
       try {

test/core/test/wait.test.ts

@@ -1,4 +1,3 @@
-import { getSafeTimers } from '@vitest/utils'
 import { describe, expect, test, vi } from 'vitest'
 
 describe('waitFor', () => {
@@ -88,9 +87,7 @@ describe('waitFor', () => {
   test('fakeTimer works', async () => {
     vi.useFakeTimers()
 
-    const { setTimeout: safeSetTimeout } = getSafeTimers()
-
-    safeSetTimeout(() => {
+    setTimeout(() => {
       vi.advanceTimersByTime(200)
     }, 50)
 
@@ -100,7 +97,7 @@ describe('waitFor', () => {
           resolve()
         }, 150)
       })
-    }, 50)
+    }, 200)
 
     vi.useRealTimers()
   })