replace delay.js with timers/promises

src/test/notifications-test.js

@@ -8,10 +8,10 @@
 
 const BoxError = require('../boxerror.js'),
     common = require('./common.js'),
-    delay = require('../delay.js'),
     expect = require('expect.js'),
     notifications = require('../notifications.js'),
-    safe = require('safetydance');
+    safe = require('safetydance'),
+    timers = require('timers/promises');
 
 const EVENT_0 = {
     id: 'event_0',
@@ -34,7 +34,7 @@ describe('Notifications', function () {
             expect(error).to.equal(null);
             expect(id).to.be.a('string');
             notificationIds.push(id);
-            await delay(1000);
+            await timers.setTimeout(1000);
         }
     });