Stabilize another test (#15697)

Saw this one fail on azure

test/integration/empty-object-getInitialProps/test/index.test.js

@@ -8,6 +8,7 @@ import {
   launchApp,
   killApp,
   waitFor,
+  check,
 } from 'next-test-utils'
 
 jest.setTimeout(1000 * 60 * 2)
@@ -49,6 +50,7 @@ describe('Empty Project', () => {
 
   it('should show empty object warning during client transition', async () => {
     const browser = await webdriver(appPort, '/static')
+    try {
       await browser.eval(`(function() {
         window.gotWarn = false
         const origWarn = console.warn
@@ -60,9 +62,12 @@ describe('Empty Project', () => {
         }
         window.next.router.replace('/another')
       })()`)
-    await waitFor(1000)
+      await check(async () => {
         const gotWarn = await browser.eval(`window.gotWarn`)
-    expect(gotWarn).toBe(true)
+        return gotWarn ? 'pass' : 'fail'
+      }, 'pass')
+    } finally {
       await browser.close()
+    }
   })
 })