prove wait for works when using useFakeTimers

Author: Lei Chen

src/dom/__tests__/asyncHook.test.ts

@@ -100,6 +100,27 @@ describe('async hook tests', () => {
 
     expect(complete).toBe(true)
   })
+  test('should wait for arbitrary expectation to pass when use jest.usedFakeTimers() ', async () => {
+    jest.useFakeTimers()
+
+    const { waitFor } = renderHook(() => null)
+
+    let actual = 0
+    const expected = 1
+
+    setTimeout(() => {
+      actual = expected
+    }, 200)
+    let complete = false
+    jest.advanceTimersByTime(1000)
+    await waitFor(() => {
+      expect(actual).toBe(expected)
+      complete = true
+    })
+
+    expect(complete).toBe(true)
+    jest.useRealTimers()
+  })
 
   test('should not hang if expectation is already passing', async () => {
     const { result, waitFor } = renderHook(() => useSequence(['first', 'second']))