test: add tests to prove jest useFakeTimers is supported (#641)

Co-authored-by: Lei Chen <[email protected]>
Co-authored-by: Michael Peyper <[email protected]>

src/__tests__/asyncHook.fakeTimers.test.ts

@@ -0,0 +1,58 @@
+describe('async hook (fake timers) tests', () => {
+  beforeEach(() => {
+    jest.useFakeTimers()
+  })
+
+  afterEach(() => {
+    jest.useRealTimers()
+  })
+
+  runForRenderers(['default', 'dom', 'native', 'server/hydrated'], ({ renderHook }) => {
+    test('should wait for arbitrary expectation to pass when using advanceTimersByTime()', async () => {
+      const { waitFor } = renderHook(() => null)
+
+      let actual = 0
+      const expected = 1
+
+      setTimeout(() => {
+        actual = expected
+      }, 200)
+
+      let complete = false
+
+      jest.advanceTimersByTime(200)
+
+      await waitFor(() => {
+        expect(actual).toBe(expected)
+        complete = true
+      })
+
+      expect(complete).toBe(true)
+    })
+
+    test('should wait for arbitrary expectation to pass when using runOnlyPendingTimers()', async () => {
+      const { waitFor } = renderHook(() => null)
+
+      let actual = 0
+      const expected = 1
+
+      setTimeout(() => {
+        actual = expected
+      }, 200)
+
+      let complete = false
+
+      jest.runOnlyPendingTimers()
+
+      await waitFor(() => {
+        expect(actual).toBe(expected)
+        complete = true
+      })
+
+      expect(complete).toBe(true)
+    })
+  })
+})
+
+// eslint-disable-next-line jest/no-export
+export {}